"Unable to find any RandR outputs" on nvidia gpu #3559

KabanFriends · 2025-07-07T01:00:36Z

KabanFriends
Jul 7, 2025

Hello, I'm trying to use xrdp with my nvidia GPU (GTX 1060). It's very confusing whether nvidia GPUs are supposed to work or not (old issues say it's not supported but there seems to be some work merged in devel branch and there are reports that nvidia GPUs do work such as #3463)

I'm using Arch Linux with xrdp and xorgxrdp from the latest devel commit:

[kabanfriends@artes ~]$ pacman -Qs xrdp
local/xorgxrdp-git 0.10.4.r96.gb32e8c6-1
    Xorg drivers for xrdp. Git version, devel branch.
local/xorgxrdp-git-debug 0.10.4.r96.gb32e8c6-1
    Detached debugging symbols for xorgxrdp-git
local/xrdp-git 0.10.4.r510.gdd173d4e-1
    An open source remote desktop protocol (RDP) server. Git version, devel branch.
local/xrdp-git-debug 0.10.4.r510.gdd173d4e-1
    Detached debugging symbols for xrdp-git

However, when I try to log into my session, it doesn't get to the window manager and fails with a dialog saying Can't create session for user kabanfriends - X server could not be started and xrdp-sesman log says Unable to find any RandR outputs.

Here are relevant logs:
.xorgxrdp.10.log:

[  1937.858]
X.Org X Server 1.21.1.18
X Protocol Version 11, Revision 0
[  1937.858] Current Operating System: Linux artes 6.15.5-arch1-1 #1 SMP PREEMPT_DYNAMIC Sun, 06 Jul 2025 11:14:36 +0000 x86_64
[  1937.858] Kernel command line: initrd=\initramfs-linux.img root=PARTUUID=d9c14d02-5e39-41b6-bc19-d6ca82024856 zswap.enabled=0 rw rootfstype=ext4
[  1937.858]
[  1937.858] Current version of pixman: 0.46.2
[  1937.858]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[  1937.858] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[  1937.858] (++) Log file: ".xorgxrdp.10.log", Time: Mon Jul  7 09:52:06 2025
[  1937.858] (++) Using config file: "/etc/X11/xrdp/xorg_nvidia.conf"
[  1937.858] (==) Using config directory: "/etc/X11/xorg.conf.d"
[  1937.858] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[  1937.858] (**) Option "defaultserverlayout" "XRDP GPU Server"
[  1937.858] (**) ServerLayout "XRDP GPU Server"
[  1937.858] (**) |-->Screen "dGPU" (0)
[  1937.858] (**) |   |-->Monitor "<default monitor>"
[  1937.858] (**) |   |-->Device "dGPU"
[  1937.858] (==) No monitor specified for screen "dGPU".
        Using a default monitor configuration.
[  1937.858] (**) |-->Input Device "xrdpMouse"
[  1937.858] (**) |-->Input Device "xrdpKeyboard"
[  1937.858] (**) Option "DontVTSwitch" "on"
[  1937.858] (**) Option "AutoAddDevices" "off"
[  1937.858] (**) Option "AutoAddGPU" "off"
[  1937.858] (**) Allowing byte-swapped clients
[  1937.858] (**) Not automatically adding devices
[  1937.858] (==) Automatically enabling devices
[  1937.858] (**) Not automatically adding GPU devices
[  1937.858] (==) Automatically binding GPU devices
[  1937.858] (==) Max clients allowed: 256, resource mask: 0x1fffff
[  1937.858] (WW) The directory "/usr/share/fonts/misc" does not exist.
[  1937.858]    Entry deleted from font path.
[  1937.858] (WW) The directory "/usr/share/fonts/OTF" does not exist.
[  1937.858]    Entry deleted from font path.
[  1937.858] (WW) The directory "/usr/share/fonts/Type1" does not exist.
[  1937.858]    Entry deleted from font path.
[  1937.858] (WW) The directory "/usr/share/fonts/100dpi" does not exist.
[  1937.858]    Entry deleted from font path.
[  1937.858] (WW) The directory "/usr/share/fonts/75dpi" does not exist.
[  1937.858]    Entry deleted from font path.
[  1937.858] (==) FontPath set to:
        /usr/share/fonts/TTF
[  1937.858] (==) ModulePath set to "/usr/lib/xorg/modules"
[  1937.858] (II) Module ABI versions:
[  1937.858]    X.Org ANSI C Emulation: 0.4
[  1937.858]    X.Org Video Driver: 25.2
[  1937.858]    X.Org XInput driver : 24.4
[  1937.858]    X.Org Server Extension : 10.0
[  1937.859] (--) using VT number 2

[  1937.859] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
[  1937.859] (II) xfree86: Adding drm device (/dev/dri/card1)
[  1937.859] (II) Platform probe for /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1
[  1937.861] (**) OutputClass "nvidia" ModulePath extended to "/usr/lib/nvidia/xorg,/usr/lib/xorg/modules,/usr/lib/xorg/modules"
[  1937.862] (--) PCI:*(1@0:0:0) 10de:1c03:19da:1438 rev 161, Mem @ 0xf6000000/16777216, 0xe0000000/268435456, 0xf0000000/33554432, I/O @ 0x0000e000/128, BIOS @ 0x????????/131072
[  1937.862] (II) "glx" will be loaded by default.
[  1937.862] (II) LoadModule: "xorgxrdp"
[  1937.862] (II) Loading /usr/lib/xorg/modules/libxorgxrdp.so
[  1937.866] (II) Module XORGXRDP: vendor="X.Org Foundation"
[  1937.866]    compiled for 1.21.1.18, module version = 0.10.80
[  1937.866]    ABI class: X.Org Video Driver, version 25.2
[  1937.866] xorgxrdpSetup:
[  1937.866] (II) LoadModule: "glx"
[  1937.866] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[  1937.867] (II) Module glx: vendor="X.Org Foundation"
[  1937.867]    compiled for 1.21.1.18, module version = 1.0.0
[  1937.867]    ABI class: X.Org Server Extension, version 10.0
[  1937.867] (II) LoadModule: "nvidia"
[  1937.867] (II) Loading /usr/lib/xorg/modules/drivers/nvidia_drv.so
[  1937.868] (II) Module nvidia: vendor="NVIDIA Corporation"
[  1937.868]    compiled for 1.6.99.901, module version = 1.0.0
[  1937.868]    Module class: X.Org Video Driver
[  1937.868] (II) LoadModule: "xrdpmouse"
[  1937.868] (II) Loading /usr/lib/xorg/modules/input/xrdpmouse_drv.so
[  1937.868] (II) Module XRDPMOUSE: vendor="X.Org Foundation"
[  1937.868]    compiled for 1.21.1.18, module version = 0.10.80
[  1937.868]    Module class: X.Org XInput Driver
[  1937.868]    ABI class: X.Org XInput driver, version 24.4
[  1937.868] rdpmousePlug:
[  1937.868] (II) LoadModule: "xrdpkeyb"
[  1937.868] (II) Loading /usr/lib/xorg/modules/input/xrdpkeyb_drv.so
[  1937.868] (II) Module XRDPKEYB: vendor="X.Org Foundation"
[  1937.868]    compiled for 1.21.1.18, module version = 0.10.80
[  1937.868]    Module class: X.Org XInput Driver
[  1937.868]    ABI class: X.Org XInput driver, version 24.4
[  1937.868] rdpkeybPlug:
[  1937.868] xorgxrdpCheckWrap: NVIDIA driver found
[  1937.868] (II) NVIDIA dlloader X Driver  575.64.03  Wed Jun 25 18:08:44 UTC 2025
[  1937.868] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[  1937.868] xorgxrdpDriverFunc:
[  1937.868] xorgxrdpPlatformProbe:
[  1937.868] (II) Loading sub module "fb"
[  1937.868] (II) LoadModule: "fb"
[  1937.868] (II) Module "fb" already built-in
[  1937.868] (II) Loading sub module "wfb"
[  1937.868] (II) LoadModule: "wfb"
[  1937.868] (II) Loading /usr/lib/xorg/modules/libwfb.so
[  1937.868] (II) Module wfb: vendor="X.Org Foundation"
[  1937.868]    compiled for 1.21.1.18, module version = 1.0.0
[  1937.868]    ABI class: X.Org ANSI C Emulation, version 0.4
[  1937.869] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support
[  1937.869] xorgxrdpPreInit:
[  1937.869] (II) NVIDIA(0): Creating default Display subsection in Screen section
        "dGPU" for depth/fbbpp 24/32
[  1937.869] (==) NVIDIA(0): Depth 24, (==) framebuffer bpp 32
[  1937.869] (==) NVIDIA(0): RGB weight 888
[  1937.869] (==) NVIDIA(0): Default visual is TrueColor
[  1937.869] (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
[  1937.869] (II) Applying OutputClass "nvidia" options to /dev/dri/card1
[  1937.869] (**) NVIDIA(0): Option "DPI" "96 x 96"
[  1937.869] (**) NVIDIA(0): Option "ConnectToAcpid" "false"
[  1937.869] (**) NVIDIA(0): Option "AllowEmptyInitialConfiguration"
[  1937.869] (**) NVIDIA(0): Option "UseDisplayDevice" "none"
[  1937.869] (**) NVIDIA(0): Enabling 2D acceleration
[  1937.869] (**) NVIDIA(0): Option "UseDisplayDevice" set to "none"; enabling NoScanout
[  1937.869] (**) NVIDIA(0):     mode
[  1937.869] (II) Loading sub module "glxserver_nvidia"
[  1937.869] (II) LoadModule: "glxserver_nvidia"
[  1937.869] (II) Loading /usr/lib/nvidia/xorg/libglxserver_nvidia.so
[  1937.883] (II) Module glxserver_nvidia: vendor="NVIDIA Corporation"
[  1937.883]    compiled for 1.6.99.901, module version = 1.0.0
[  1937.883]    Module class: X.Org Server Extension
[  1937.883] (II) NVIDIA GLX Module  575.64.03  Wed Jun 25 18:11:49 UTC 2025
[  1937.883] (II) NVIDIA: The X server supports PRIME Render Offload.
[  1937.884] (II) NVIDIA(0): NVIDIA GPU NVIDIA GeForce GTX 1060 6GB (GP106-A) at PCI:1:0:0
[  1937.884] (II) NVIDIA(0):     (GPU-0)
[  1937.884] (--) NVIDIA(0): Memory: 6291456 kBytes
[  1937.884] (--) NVIDIA(0): VideoBIOS: 86.06.45.00.3c
[  1937.884] (II) NVIDIA(0): Detected PCI Express Link width: 16X
[  1937.884] (II) NVIDIA(0): Validated MetaModes:
[  1937.884] (II) NVIDIA(0):     "NULL"
[  1937.884] (II) NVIDIA(0): Virtual screen size determined to be 640 x 480
[  1937.884] (**) NVIDIA(0): DPI set to (96, 96); computed from "DPI" X config option
[  1937.884] xorgxrdpScreenInit:
[  1937.884] (WW) NVIDIA: Failed to bind sideband socket to
[  1937.884] (WW) NVIDIA:     '/var/run/nvidia-xdriver-af6bb840' Permission denied
[  1937.884] (II) NVIDIA: Reserving 24576.00 MB of virtual memory for indirect memory
[  1937.884] (II) NVIDIA:     access.
[  1937.903] (II) NVIDIA(0): Setting mode "NULL"
[  1937.907] (==) NVIDIA(0): Disabling shared memory pixmaps
[  1937.907] (==) NVIDIA(0): Backing store enabled
[  1937.907] (==) NVIDIA(0): Silken mouse enabled
[  1937.907] (==) NVIDIA(0): DPMS enabled
[  1937.907] (II) Loading sub module "dri2"
[  1937.907] (II) LoadModule: "dri2"
[  1937.907] (II) Module "dri2" already built-in
[  1937.907] (II) NVIDIA(0): [DRI2] Setup complete
[  1937.907] (II) NVIDIA(0): [DRI2]   VDPAU driver: nvidia
[  1937.907] xorgxrdpScreenInit: nvidia_grid 0
[  1937.907] xorgxrdpScreenInit: width 640 height 480
[  1937.907] rdpClientConInit: disconnect idle session after [0] sec
[  1937.907] rdpClientConInit: kill disconnected [0] timeout [0] sec
[  1937.907] rdpSimdInit: assigning yuv functions
[  1937.907] rdpSimdInit: cpuid ax 1 cx 0 return ax 0x000306c3 bx 0x05100800 cx 0x7ffafbff dx 0xbfebfbff
[  1937.907] rdpSimdInit: sse2 amd64 yuv functions assigned
[  1937.907] (II) Initializing extension Generic Event Extension
[  1937.907] (II) Initializing extension SHAPE
[  1937.907] (II) Initializing extension MIT-SHM
[  1937.907] (II) Initializing extension XInputExtension
[  1937.907] (II) Initializing extension XTEST
[  1937.907] (II) Initializing extension BIG-REQUESTS
[  1937.907] (II) Initializing extension SYNC
[  1937.907] (II) Initializing extension XKEYBOARD
[  1937.908] (II) Initializing extension XC-MISC
[  1937.908] (II) Initializing extension SECURITY
[  1937.908] (II) Initializing extension XFIXES
[  1937.908] (II) Initializing extension RENDER
[  1937.908] (II) Initializing extension RANDR
[  1937.908] (II) Initializing extension COMPOSITE
[  1937.908] (II) Initializing extension DAMAGE
[  1937.908] (II) Initializing extension MIT-SCREEN-SAVER
[  1937.908] (II) Initializing extension DOUBLE-BUFFER
[  1937.908] (II) Initializing extension RECORD
[  1937.908] (II) Initializing extension DPMS
[  1937.908] (II) Initializing extension Present
[  1937.908] (II) Initializing extension DRI3
[  1937.908] (II) Initializing extension X-Resource
[  1937.908] (II) Initializing extension XVideo
[  1937.909] (II) Initializing extension XVideo-MotionCompensation
[  1937.909] (II) Initializing extension GLX
[  1937.909] (II) Initializing extension GLX
[  1937.909] (II) Indirect GLX disabled.
[  1937.909] (II) GLX: Another vendor is already registered for screen 0
[  1937.909] (II) Initializing extension XFree86-VidModeExtension
[  1937.909] (II) Initializing extension XFree86-DGA
[  1937.909] (II) Initializing extension XFree86-DRI
[  1937.909] (II) Initializing extension DRI2
[  1937.909] (II) Initializing extension NV-GLX
[  1937.909] (II) Initializing extension NV-CONTROL
[  1937.909] rdpCreateScreenResources:
[  1937.932] (II) Using input driver 'XRDPMOUSE' for 'xrdpMouse'
[  1937.932] (**) Option "CorePointer"
[  1937.932] (**) xrdpMouse: always reports core events
[  1937.932] rdpmousePreInit: drv 0x565434657bb0 info 0x565434bd0460, flags 0x0
[  1937.932] (II) XINPUT: Adding extended input device "xrdpMouse" (type: Mouse, id 6)
[  1937.932] rdpmouseControl: what 0
[  1937.932] rdpmouseDeviceInit:
[  1937.932] rdpmouseCtrl:
[  1937.932] rdpRegisterInputCallback: type 1 proc 0x7fac712be410
[  1937.932] (**) xrdpMouse: (accel) keeping acceleration scheme 1
[  1937.932] (**) xrdpMouse: (accel) acceleration profile 0
[  1937.932] (**) xrdpMouse: (accel) acceleration factor: 2.000
[  1937.932] (**) xrdpMouse: (accel) acceleration threshold: 4
[  1937.932] rdpmouseControl: what 1
[  1937.932] rdpmouseDeviceOn:
[  1937.932] (II) Using input driver 'XRDPKEYB' for 'xrdpKeyboard'
[  1937.932] (**) Option "CoreKeyboard"
[  1937.932] (**) xrdpKeyboard: always reports core events
[  1937.932] rdpkeybPreInit: drv 0x565434658300 info 0x565434dafcc0, flags 0x0
[  1937.932] (II) XINPUT: Adding extended input device "xrdpKeyboard" (type: Keyboard, id 7)
[  1937.932] rdpkeybControl: what 0
[  1937.932] rdpLoadLayout: rules="evdev" model="pc104" variant=""layout="us" options=""
[  1937.944] rdpkeybChangeKeyboardControl:
[  1937.944] rdpkeybChangeKeyboardControl: autoRepeat on
[  1937.944] rdpkeybChangeKeyboardControl:
[  1937.944] rdpkeybChangeKeyboardControl: autoRepeat on
[  1937.944] rdpRegisterInputCallback: type 0 proc 0x7fac712b96d0
[  1937.944] rdpkeybControl: what 1
[  1937.944] rdpkeybDeviceOn:
[  1937.964] (II) config/udev: Adding input device Power Button (/dev/input/event1)
[  1937.964] (II) AutoAddDevices is off - not adding device.
[  1937.964] (II) config/udev: Adding input device Power Button (/dev/input/event0)
[  1937.964] (II) AutoAddDevices is off - not adding device.
[  1937.965] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=3 (/dev/input/event10)
[  1937.965] (II) AutoAddDevices is off - not adding device.
[  1937.965] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=7 (/dev/input/event11)
[  1937.965] (II) AutoAddDevices is off - not adding device.
[  1937.966] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=8 (/dev/input/event12)
[  1937.966] (II) AutoAddDevices is off - not adding device.
[  1937.966] (II) config/udev: Adding input device HDA NVidia HDMI/DP,pcm=9 (/dev/input/event13)
[  1937.966] (II) AutoAddDevices is off - not adding device.
[  1937.966] (II) config/udev: Adding input device Logitech USB Receiver (/dev/input/event4)
[  1937.966] (II) AutoAddDevices is off - not adding device.
[  1937.967] (II) config/udev: Adding input device Logitech USB Receiver Mouse (/dev/input/event5)
[  1937.967] (II) AutoAddDevices is off - not adding device.
[  1937.967] (II) config/udev: Adding input device Logitech USB Receiver Mouse (/dev/input/mouse0)
[  1937.967] (II) AutoAddDevices is off - not adding device.
[  1937.968] (II) config/udev: Adding input device Logitech USB Receiver Consumer Control (/dev/input/event6)
[  1937.968] (II) AutoAddDevices is off - not adding device.
[  1937.968] (II) config/udev: Adding input device Logitech USB Receiver System Control (/dev/input/event7)
[  1937.968] (II) AutoAddDevices is off - not adding device.
[  1937.969] (II) config/udev: Adding input device Logitech M510 (/dev/input/event2)
[  1937.969] (II) AutoAddDevices is off - not adding device.
[  1937.969] (II) config/udev: Adding input device Logitech M510 (/dev/input/mouse1)
[  1937.969] (II) AutoAddDevices is off - not adding device.
[  1937.970] (II) config/udev: Adding input device Logitech K270 (/dev/input/event3)
[  1937.970] (II) AutoAddDevices is off - not adding device.
[  1937.970] (II) config/udev: Adding input device HDA Intel PCH Rear Mic (/dev/input/event14)
[  1937.970] (II) AutoAddDevices is off - not adding device.
[  1937.970] (II) config/udev: Adding input device HDA Intel PCH Front Mic (/dev/input/event15)
[  1937.970] (II) AutoAddDevices is off - not adding device.
[  1937.971] (II) config/udev: Adding input device HDA Intel PCH Line (/dev/input/event16)
[  1937.971] (II) AutoAddDevices is off - not adding device.
[  1937.971] (II) config/udev: Adding input device HDA Intel PCH Line Out Front (/dev/input/event17)
[  1937.971] (II) AutoAddDevices is off - not adding device.
[  1937.971] (II) config/udev: Adding input device HDA Intel PCH Line Out Surround (/dev/input/event18)
[  1937.971] (II) AutoAddDevices is off - not adding device.
[  1937.971] (II) config/udev: Adding input device HDA Intel PCH Line Out CLFE (/dev/input/event19)
[  1937.971] (II) AutoAddDevices is off - not adding device.
[  1937.971] (II) config/udev: Adding input device HDA Intel PCH Line Out Side (/dev/input/event20)
[  1937.971] (II) AutoAddDevices is off - not adding device.
[  1937.972] (II) config/udev: Adding input device HDA Intel PCH Front Headphone (/dev/input/event21)
[  1937.972] (II) AutoAddDevices is off - not adding device.
[  1937.972] (II) config/udev: Adding input device Eee PC WMI hotkeys (/dev/input/event9)
[  1937.972] (II) AutoAddDevices is off - not adding device.
[  1937.972] (II) config/udev: Adding input device PC Speaker (/dev/input/event8)
[  1937.972] (II) AutoAddDevices is off - not adding device.
[  1937.977] xorgxrdpDeferredStartup:
[  1937.977] xorgxrdpSetupDamage: DamageRegister ok
[  1938.045] rdpInDeferredRepeatCallback:
[  1938.045] rdpkeybChangeKeyboardControl:
[  1938.045] rdpkeybChangeKeyboardControl: autoRepeat off
[  1938.045] rdpInDeferredRepeatCallback:
[  1938.045] rdpkeybChangeKeyboardControl:
[  1938.045] rdpkeybChangeKeyboardControl: autoRepeat off
[  1948.812] rdpmouseControl: what 2
[  1948.812] rdpmouseDeviceOff:
[  1948.812] rdpkeybControl: what 2
[  1948.812] rdpkeybDeviceOff:
[  1948.814] xorgxrdpDamageDestroy:
[  1948.814] rdpkeybControl: what 3
[  1948.814] rdpkeybUnInit: drv 0x565434658300 info 0x565434dafcc0, flags 0x0
[  1948.814] rdpUnregisterInputCallback: proc 0x7fac712b96d0
[  1948.814] rdpmouseControl: what 3
[  1948.814] rdpmouseUnInit: drv 0x565434657bb0 info 0x565434bd0460, flags 0x0
[  1948.814] rdpUnregisterInputCallback: proc 0x7fac712be410
[  1948.814] rdpCloseScreen:
[  1948.819] (II) NVIDIA(GPU-0): Deleting GPU-0
[  1948.819] xorgxrdpDownDown:
[  1948.819] xorgxrdpDownDown: 1
[  1948.819] rdpClientConDeinit:
[  1948.819] rdpClientConDeinit: deleting file /var/run/xrdp/1000/xrdp_display_10
[  1948.819] rdpClientConDeinit: deleting file /var/run/xrdp/1000/xrdp_disconnect_display_10
[  1948.820] (II) Server terminated successfully (0). Closing log file.

xrdp-sesman.log:

[2025-07-07T09:52:05.805+0900] [INFO ] Socket 13: connection accepted from AF_UNIX
[2025-07-07T09:52:05.807+0900] [INFO ] Received system login request from xrdp for user: kabanfriends IP: ::ffff:192.168.10.138
[2025-07-07T09:52:05.810+0900] [INFO ] starting xrdp-sesexec with pid 2114
[2025-07-07T09:52:05.862+0900] [INFO ] TerminalServerUsers group tsusers doesn't exist. Access granted for kabanfriends
[2025-07-07T09:52:05.911+0900] [INFO ] Access permitted for user: kabanfriends
[2025-07-07T09:52:05.912+0900] [INFO ] Received sys login status for kabanfriends : logged in
[2025-07-07T09:52:05.913+0900] [INFO ] Received request from xrdp to create a session for user kabanfriends
[2025-07-07T09:52:05.967+0900] [INFO ] Starting X server on display 10: /usr/lib/Xorg :10 -auth .Xauthority -config xrdp/xorg_nvidia.conf -noreset -nolisten tcp -logfile .xorgxrdp.%s.log
[2025-07-07T09:52:16.971+0900] [ERROR] waitforx: Unable to find any RandR outputs
[2025-07-07T09:52:16.975+0900] [ERROR] An error occurred waiting for the X server
[2025-07-07T09:52:16.986+0900] [INFO ] sesman: Session on display :10 has finished.
[2025-07-07T09:52:16.987+0900] [ERROR] sesexec_main_loop: trans_check_wait_objs failed for ECP transport

xrdp.log:

[2025-07-07T09:52:01.955+0900] [INFO ] Socket 14: connection accepted from [::ffff:192.168.10.138]:54234
[2025-07-07T09:52:01.961+0900] [INFO ] Using default X.509 certificate: /etc/xrdp/cert.pem
[2025-07-07T09:52:01.962+0900] [INFO ] Using default X.509 key file: /etc/xrdp/key.pem
[2025-07-07T09:52:01.970+0900] [INFO ] Client requested security types (RDP assumed) : SSL|HYBRID|HYBRID_EX
[2025-07-07T09:52:01.971+0900] [INFO ] Selected TLS security
[2025-07-07T09:52:01.993+0900] [ERROR] SSL_read: I/O error
[2025-07-07T09:52:01.994+0900] [ERROR] libxrdp_force_read: header read error
[2025-07-07T09:52:01.995+0900] [ERROR] Processing [ITU-T T.125] Connect-Initial failed
[2025-07-07T09:52:01.996+0900] [ERROR] [MCS Connection Sequence] receive connection request failed
[2025-07-07T09:52:01.996+0900] [ERROR] xrdp_sec_incoming: xrdp_mcs_incoming failed
[2025-07-07T09:52:01.997+0900] [ERROR] xrdp_rdp_incoming: xrdp_sec_incoming failed
[2025-07-07T09:52:01.998+0900] [ERROR] xrdp_process_main_loop: libxrdp_process_incoming failed
[2025-07-07T09:52:01.999+0900] [ERROR] xrdp_iso_send: trans_write_copy_s failed
[2025-07-07T09:52:01.999+0900] [ERROR] Sending [ITU T.125] DisconnectProviderUltimatum failed
[2025-07-07T09:52:02.193+0900] [INFO ] Socket 14: connection accepted from [::ffff:192.168.10.138]:54235
[2025-07-07T09:52:02.205+0900] [INFO ] Using default X.509 certificate: /etc/xrdp/cert.pem
[2025-07-07T09:52:02.214+0900] [INFO ] Using default X.509 key file: /etc/xrdp/key.pem
[2025-07-07T09:52:02.224+0900] [INFO ] Client requested security types (RDP assumed) : SSL|HYBRID|HYBRID_EX
[2025-07-07T09:52:02.232+0900] [INFO ] Selected TLS security
[2025-07-07T09:52:02.313+0900] [INFO ] Connected client computer name: PC1
[2025-07-07T09:52:02.322+0900] [INFO ] client supports gfx protocol
[2025-07-07T09:52:02.331+0900] [WARN ] Received [MS-RDPBCGR] TS_UD_HEADER type 0xc006 is unknown (ignored)
[2025-07-07T09:52:02.339+0900] [WARN ] Received [MS-RDPBCGR] TS_UD_HEADER type 0xc00a is unknown (ignored)
[2025-07-07T09:52:02.348+0900] [INFO ] TLS connection established from [::ffff:192.168.10.138]:54235 TLSv1.3 with cipher TLS_AES_256_GCM_SHA384
[2025-07-07T09:52:02.396+0900] [INFO ] Client supports single-screen resizes by xrdp
[2025-07-07T09:52:02.405+0900] [INFO ] xrdp_caps_process_pointer: client supports new(color) cursor
[2025-07-07T09:52:02.414+0900] [INFO ] Client supports Unicode input
[2025-07-07T09:52:02.422+0900] [INFO ] xrdp_process_offscreen_bmpcache: support level 1 cache size 10485760 bytes cache entries 100
[2025-07-07T09:52:02.430+0900] [INFO ] xrdp_caps_process_codecs: NSCodec(CA8D1BB9-000F-154F-589F-AE2D1A87E2D6), codec id [1], properties len [3]
[2025-07-07T09:52:02.438+0900] [INFO ] xrdp_caps_process_codecs: Image RemoteFX(2744CCD4-9D8A-4E74-803C-0ECBEEA19C54), codec id [5], properties len [49]
[2025-07-07T09:52:02.446+0900] [INFO ] Client Capability: LARGE_POINTER_FLAG_96x96 supported
[2025-07-07T09:52:02.475+0900] [ERROR] Error loading keymap file /etc/xrdp/km-e0010411.toml (No such file or directory)
[2025-07-07T09:52:02.489+0900] [INFO ] Loading keymap file /etc/xrdp/km-00000411.toml
[2025-07-07T09:52:02.501+0900] [INFO ] TConfig: Loading GFX config file /etc/xrdp/gfx.toml
[2025-07-07T09:52:02.510+0900] [INFO ] Login screen monitor height is 1080 pixels over 336 mm (81 DPI)
[2025-07-07T09:52:02.576+0900] [INFO ] xrdp_egfx_create: error 0 channel_id 1
[2025-07-07T09:52:02.615+0900] [INFO ] xrdp_mm_egfx_caps_advertise:
[2025-07-07T09:52:02.665+0900] [INFO ]   version 0x00080004 flags 0x00000000 (index: 0)
[2025-07-07T09:52:02.666+0900] [INFO ]   version 0x00080105 flags 0x00000000 (index: 1)
[2025-07-07T09:52:02.667+0900] [INFO ]   version 0x000a0002 flags 0x00000000 (index: 2)
[2025-07-07T09:52:02.668+0900] [INFO ]   version 0x000a0200 flags 0x00000000 (index: 3)
[2025-07-07T09:52:02.668+0900] [INFO ]   version 0x000a0301 flags 0x00000000 (index: 4)
[2025-07-07T09:52:02.669+0900] [INFO ]   version 0x000a0400 flags 0x00000000 (index: 5)
[2025-07-07T09:52:02.670+0900] [INFO ]   version 0x000a0502 flags 0x00000000 (index: 6)
[2025-07-07T09:52:02.671+0900] [INFO ]   version 0x000a0600 flags 0x00000000 (index: 7)
[2025-07-07T09:52:02.671+0900] [INFO ] Codec search order is H264, RFX
[2025-07-07T09:52:02.672+0900] [INFO ] Matched RFX mode
[2025-07-07T09:52:02.673+0900] [INFO ]   replying version 0x000a0600 flags 0x00000000
[2025-07-07T09:52:02.674+0900] [INFO ] xrdp_mm_egfx_caps_advertise: xrdp_egfx_send_capsconfirm error 0 best_index 7
[2025-07-07T09:52:02.675+0900] [INFO ] xrdp_egfx_reset_graphics:
[2025-07-07T09:52:02.675+0900] [INFO ] xrdp_egfx_reset_graphics: width 1920 height 1080 monitorcount 1
[2025-07-07T09:52:02.676+0900] [INFO ] xrdp_mm_egfx_caps_advertise: xrdp_egfx_send_reset_graphics error 0 monitorCount 0
[2025-07-07T09:52:02.677+0900] [INFO ] xrdp_mm_egfx_create_surfaces: map surface_id 0 left 0 top 0 width 1920 height 1080
[2025-07-07T09:52:02.677+0900] [INFO ] xrdp_encoder_create: starting gfx rfx pro codec session
[2025-07-07T09:52:02.678+0900] [INFO ] xrdp_mm_egfx_invalidate_wm_screen:
[2025-07-07T09:52:02.679+0900] [INFO ] xrdp_mm_egfx_caps_advertise: egfx created.
[2025-07-07T09:52:05.801+0900] [WARN ] Ignoring obsolete SCP port value '3350'
[2025-07-07T09:52:05.805+0900] [INFO ] xrdp_wm_log_msg: sesman connect ok
[2025-07-07T09:52:05.806+0900] [INFO ] xrdp_wm_log_msg: Performing login request for kabanfriends
[2025-07-07T09:52:05.912+0900] [INFO ] xrdp_wm_log_msg: login was successful - creating session
[2025-07-07T09:52:16.986+0900] [INFO ] xrdp_wm_log_msg: Can't create session for user kabanfriends - X server could not be started
[2025-07-07T09:57:47.791+0900] [INFO ] TConfig: Loading GFX config file /etc/xrdp/gfx.toml
[2025-07-07T09:57:47.795+0900] [INFO ] Login screen monitor height is 1080 pixels over 336 mm (81 DPI)
[2025-07-07T09:57:48.954+0900] [ERROR] xrdp_sec_recv: xrdp_mcs_recv failed
[2025-07-07T09:57:48.956+0900] [ERROR] xrdp_rdp_recv: xrdp_sec_recv failed
[2025-07-07T09:57:48.957+0900] [ERROR] libxrdp_process_data: xrdp_rdp_recv failed
[2025-07-07T09:57:48.958+0900] [ERROR] xrdp_process_data_in: xrdp_process_loop failed
[2025-07-07T09:57:48.959+0900] [ERROR] SSL_write: I/O error
[2025-07-07T09:57:48.960+0900] [ERROR] SSL: error:80000068:system library::Connection reset by peer
[2025-07-07T09:57:48.961+0900] [ERROR] xrdp_iso_send: trans_write_copy_s failed
[2025-07-07T09:57:48.961+0900] [ERROR] Sending [ITU T.125] DisconnectProviderUltimatum faile

And my xorg config (xorg_nvidia.conf):

Section "ServerLayout"
  Identifier "XRDP GPU Server"
  Screen 0 "dGPU"
  InputDevice "xrdpMouse" "CorePointer"
  InputDevice "xrdpKeyboard" "CoreKeyboard"
EndSection

Section "ServerFlags"
  # This line prevents "ServerLayout" sections in xorg.conf.d files
  # overriding the "XRDP GPU Server" layout (xrdp #1784)
  Option "DefaultServerLayout" "XRDP GPU Server"
  Option "DontVTSwitch" "on"
  Option "AutoAddDevices" "off"
  Option "AutoAddGPU" "off"
EndSection

# This section might be needed if the nvidia Xorg module is not installed
# in the default modules directory ie /usr/lib/xorg/modules
# example package on ubuntu xserver-xorg-video-nvidia-535
#Section "Files"
#    ModulePath "/usr/lib/x86_64-linux-gnu/nvidia/xorg,/usr/lib/xorg/modules"
#EndSection

Section "Module"
  Load "xorgxrdp"
EndSection

Section "InputDevice"
  Identifier "xrdpKeyboard"
  Driver "xrdpkeyb"
EndSection

Section "InputDevice"
  Identifier "xrdpMouse"
  Driver "xrdpmouse"
EndSection

Section "Screen"
  Identifier "dGPU"
  Device "dGPU"
  Option "DPI" "96 x 96"
EndSection

Section "Device"
  Identifier "dGPU"
  Driver "nvidia"
  Option "UseDisplayDevice" "none"
  Option "ConnectToAcpid" "false"
  BusID "PCI:1:0:0"
EndSection

How can I avoid the Unable to find any RandR outputs error?

Answered by KabanFriends

Jul 8, 2025

So if anyone is struggling to set up xrdp in this environment:

Arch Linux
NVIDIA GPU and prefers to use the proprietary NVIDIA driver (GeForce GTX 1060 in my case)

Here's what I did to make it work:

Make sure the required NVIDIA drivers are installed (see ArchWiki)
Compile and install the devel branch of xrdp

Use xrdp-git AUR package

yay -S xrdp-git

Compile and install the devel branch of xorgxrdp with --enable-lrandr

Get PKGBUILD from xorgxrdp-git AUR package and modify it to include --enable-lrandr

  CFLAGS="$CFLAGS -ffat-lto-objects" \
    ./configure --prefix=/usr \
-    --enable-glamor
+    --enable-glamor \
+    --enable-lrandr

makepkg -si

devel build of xorgxrdp should c…

View full answer

KabanFriends · 2025-07-07T03:01:27Z

KabanFriends
Jul 7, 2025
Author

Reading several other issues, maybe I should have compiled xorgxrdp with --enable-lrandr? I will have to try this later when I'm back home...
But again, due to many things changing since the creation of the old issues I'm looking at, I'm not sure if they're still relevant.
If anyone knows well about the situation of Nvidia GPU in xrdp I would appreciate any sort of guide

0 replies

matt335672 · 2025-07-07T08:45:51Z

matt335672
Jul 7, 2025
Collaborator

Hi @KabanFriends

Nothing has really changed on this I'm afraid. #1697 still applies. There is no official release of xrdp which supports NVidia drivers natively yet.

That said, some PRs have been merged relatively recently, but the code is not production ready and you'll need to enable it manually. Have a look at this post and the surrounding thread.

2 replies

KabanFriends Jul 7, 2025
Author

Thank you for the reply! I will try this later.
Since it took so long for me to get to this point, later I'll be leaving a note of the steps I took for anyone else that might be in the same situation.

Also, just noting that Nouveau driver with Glamor build of xorgxrdp works quite well for my use case (app dev & testing simple games). So if anyone else is looking to set up xrdp with a Nvidia GPU, using Nouveau might be an easier solution.

(I was just trying to see what I can do with the proprietary driver as I didn't like my GPU fans always spinning at a constant speed due to an improper fan control implementation in Nouveau)

KabanFriends Jul 8, 2025
Author

So if anyone is struggling to set up xrdp in this environment:

Arch Linux
NVIDIA GPU and prefers to use the proprietary NVIDIA driver (GeForce GTX 1060 in my case)

Here's what I did to make it work:

Make sure the required NVIDIA drivers are installed (see ArchWiki)
Compile and install the devel branch of xrdp

Use xrdp-git AUR package

yay -S xrdp-git

Compile and install the devel branch of xorgxrdp with --enable-lrandr

Get PKGBUILD from xorgxrdp-git AUR package and modify it to include --enable-lrandr

  CFLAGS="$CFLAGS -ffat-lto-objects" \
    ./configure --prefix=/usr \
-    --enable-glamor
+    --enable-glamor \
+    --enable-lrandr

makepkg -si

devel build of xorgxrdp should come with /etc/X11/xrdp/xorg_nvidia.conf, so edit to the [Xorg] section in /etc/xrdp/sesman.ini to load the nvidia configuration instead of the default one
Edit xorg_nvidia.conf:

In Device section, change BusID to match your GPU's
In Screen section, add:

SubSection "Display"
  Virtual 1920 1080 # or whatever resolution you use
EndSubSection

Add the user you're logging in to video group (also tty? Unsure about that)
Configure .xinitrc to launch your environment
Setup done!

Hope this helps!

Answer selected by KabanFriends

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