Display detection after suspend

[oyvindskaaden]

Brief

Please let me know if this should be an issue in an another repo

I'm having an issue with the displays being detected after a suspend. It might be the NVIDIA display driver, but it manages to detect the screens after a reboot.

Both my displays are connected through a UGREEN DisplayPort KVM so I can switch between my desktop and my laptop connected to a dock. I can switch between the laptop and the desktop just fine. The screens are just not detected after a suspend.
Both screens turn on, as if there is a signal, but then back to sleep as there is no signal.

I have tried all the key combinations to get into TTY to "restart" the display manager, but as the screens are not detected, nothing shows.

I have also tried connecting an HDMI directly to the motherboard to "force" a detection, but to no avail.

Furthermore, I'm not quite sure how to debug this, as it might not be producing error logs.

The only way I get back my screens is to reboot the machine.

System

• CPU: AMD Ryzen 7 7700X
• GPU: NVIDIA GeForce RTX 4070 Ti
• Display: 2x 2560p over DisplayPort, connected to the RTX

OS

• Pop!_OS 24.04 LTS x86_64
• Linux 6.17.9-76061709-generic
• 580.119.02 NVIDIA driver

NVIDIA nvidia-smi output

❯ nvidia-smi
Sun Jan 25 16:08:43 2026
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 580.119.02             Driver Version: 580.119.02     CUDA Version: 13.0     |
+-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  Compute M. |
|                                         |                        |               MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA GeForce RTX 4070 Ti     Off |   00000000:01:00.0  On |                  N/A |
|  0%   45C    P5             23W /  285W |     848MiB /  12282MiB |     35%      Default |
|                                         |                        |                  N/A |
+-----------------------------------------+------------------------+----------------------+

+-----------------------------------------------------------------------------------------+
| Processes:                                                                              |
|  GPU   GI   CI              PID   Type   Process name                        GPU Memory |
|        ID   ID                                                               Usage      |
|=========================================================================================|
|    0   N/A  N/A            1860      G   cosmic-comp                              95MiB |
|    0   N/A  N/A            1900      G   Xwayland                                  3MiB |
|    0   N/A  N/A            1937      G   cosmic-panel                              9MiB |
|    0   N/A  N/A            1949    C+G   cosmic-workspaces                        18MiB |
|    0   N/A  N/A            1957    C+G   cosmic-files-applet                     202MiB |
|    0   N/A  N/A            2329    C+G   ...xec/xdg-desktop-portal-cosmic         18MiB |
|    0   N/A  N/A            3365      G   firefox                                 218MiB |
|    0   N/A  N/A            4081      G   alacritty                                65MiB |
+-----------------------------------------------------------------------------------------+

Cosmic Packages

cosmic-app-library/noble,now 0.1.0~1768581035~24.04~6806d2c amd64 [installed,automatic]
cosmic-applets/noble,now 1.0.2~1769095325~24.04~1ba7afe amd64 [installed,automatic]
cosmic-bg/noble,now 0.1.0~1768583551~24.04~f431b28 amd64 [installed,automatic]
cosmic-comp/noble,now 0.1~1768995933~24.04~996a8a8 amd64 [installed,automatic]
cosmic-edit/noble,now 0.1.0~1769031900~24.04~fed3a59 amd64 [installed,automatic]
cosmic-files/noble,now 1.0.0~1769031861~24.04~34a33df amd64 [installed,automatic]
cosmic-greeter-daemon/noble,now 0.1.0~1768580956~24.04~f139612 amd64 [installed,automatic]
cosmic-greeter/noble,now 0.1.0~1768580956~24.04~f139612 amd64 [installed,automatic]
cosmic-icons/noble,now 0.1.0~1765399353~24.04~cd30ffd amd64 [installed,automatic]
cosmic-idle/noble,now 0.1.0~1769104176~24.04~6d3dbed amd64 [installed,automatic]
cosmic-initial-setup/noble,now 1.0.0~1769031903~24.04~c61b11d amd64 [installed,automatic]
cosmic-launcher/noble,now 0.1.0~1768937073~24.04~0c0c28b amd64 [installed,automatic]
cosmic-notifications/noble,now 0.1.0~1768606049~24.04~23e39ec amd64 [installed,automatic]
cosmic-osd/noble,now 0.1.0~1768580938~24.04~adb6227 amd64 [installed,automatic]
cosmic-panel/noble,now 0.1.0~1764714592~24.04~8eb8a1b amd64 [installed,automatic]
cosmic-player/noble,now 0.1.0~1769031924~24.04~afcfdfd amd64 [installed,automatic]
cosmic-randr/noble,now 0.1.0~1765580395~24.04~741089c amd64 [installed,automatic]
cosmic-screenshot/noble,now 0.1.0~1768581111~24.04~01af29d amd64 [installed,automatic]
cosmic-session/noble,now 1.0.0~1769099409~24.04~3506cfc amd64 [installed,automatic]
cosmic-settings-daemon/noble,now 0.1.0~1767386013~24.04~ef024bf amd64 [installed,automatic]
cosmic-settings/noble,now 1.0.2~1769103755~24.04~1839ad3 amd64 [installed,automatic]
cosmic-store/noble,now 0.1.0~1769031948~24.04~25ca887 amd64 [installed,automatic]
cosmic-term/noble,now 0.1.0~1769031974~24.04~bc32c66 amd64 [installed]
cosmic-wallpapers/noble,noble,now 1.0.0~1744123997~24.04~189c2c6 all [installed,automatic]
cosmic-workspaces/noble,now 0.1.0~1768581091~24.04~15ce526 amd64 [installed,automatic]
pop-de-cosmic/noble,now 3.0.0~1767820609~24.04~63ed24e amd64 [installed,automatic]