amd.md: Add new section on AMD graphics

Fixes #310.

Also fix SUMMARY and Intel title.

Closes: #450 [via git-merge-pr]

Author: ahesford

src/SUMMARY.md

@@ -42,10 +42,11 @@
    - [Session and Seat Management](./config/session-management.md)
    - [Graphical Session](./config/graphical-session/index.md)
       - [Graphics Drivers](./config/graphical-session/graphics-drivers/index.md)
-         - [Intel GPU](./config/graphical-session/graphics-drivers/intel.md)
+         - [AMD or ATI](./config/graphical-session/graphics-drivers/amd.md)
+         - [Intel](./config/graphical-session/graphics-drivers/intel.md)
+         - [NVIDIA](./config/graphical-session/graphics-drivers/nvidia.md)
          - [NVIDIA
             Optimus](./config/graphical-session/graphics-drivers/optimus.md)
-         - [NVIDIA](./config/graphical-session/graphics-drivers/nvidia.md)
       - [Xorg](./config/graphical-session/xorg.md)
       - [Wayland](./config/graphical-session/wayland.md)
       - [Fonts](./config/graphical-session/fonts.md)

src/config/graphical-session/graphics-drivers/amd.md

@@ -0,0 +1,30 @@
+# AMD or ATI
+
+AMD GPU support requires the `linux-firmware-amd` package. If you have installed
+the `linux` or `linux-lts` packages, it will be installed as a dependency. If
+you installed a version-specific kernel package (e.g., `linux5.4`), it may be
+necessary to manually install `linux-firmware-amd`.
+
+## OpenGL
+
+Install the Mesa DRI package, `mesa-dri`. This is already included in the `xorg`
+meta-package, but it is needed when installing Xorg via `xorg-minimal` or for
+running a Wayland compositor.
+
+## Vulkan
+
+Install `vulkan-loader`, the Khronos Vulkan Loader. Then install one or both of
+the Mesa AMD Vulkan driver, `mesa-vulkan-radeon`; or the GPUOpen AMD Vulkan
+driver, `amdvlk`.
+
+## Xorg
+
+Installing the `xorg` meta-package will pull in both `xf86-video-amdgpu` and,
+for older hardware, `xf86-video-ati`. If you install `xorg-minimal`, choose one
+of these Xorg driver packages to match your hardware. The `amdgpu` driver should
+support cards built on AMD's "Graphics Core Next 1.2" architecture, introduced
+circa 2012.
+
+## Video acceleration
+
+Install the `mesa-vaapi` and `mesa-vdpau` packages.

src/config/graphical-session/graphics-drivers/index.md

@@ -5,6 +5,7 @@ of your system.
 
 ## Section Contents
 
-- [Intel GPU](./intel.md)
-- [NVIDIA Optimus](./optimus.md)
+- [AMD or ATI](./amd.md)
+- [Intel](./intel.md)
 - [NVIDIA](./nvidia.md)
+- [NVIDIA Optimus](./optimus.md)

src/config/graphical-session/graphics-drivers/intel.md

@@ -1,4 +1,4 @@
-# Intel GPU
+# Intel
 
 Intel GPU support requires the `linux-firmware-intel` package. If you have
 installed the `linux` or `linux-lts` packages, it will be installed as a