Bug#1008750: Workaround: Disable VGA on the motherboard

[Marko Mäkelä]

The problem appears to be that a built-in unaccelerated graphics adapter 
exists on the motherboard.

Adding file /etc/udev/rules.d/83-card0.rules
with the following contents allows GNOME to start on Wayland:

ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x1a03", ATTR{class}=="0x030000", ATTR{remove}="1"

Some possibly relevant kernel startup messages (from dmesg) are as 
follows:

[    0.596600] pci 0000:0a:00.0: vgaarb: VGA device added: decodes=io+mem,owns=none,locks=none
[    0.596600] pci 0000:81:00.0: vgaarb: setting as boot VGA device
[    0.596600] pci 0000:81:00.0: vgaarb: VGA device added: decodes=io+mem,owns=io+mem,locks=none
[    0.596600] pci 0000:0a:00.0: vgaarb: bridge control possible
[    0.596600] pci 0000:81:00.0: vgaarb: bridge control possible
[    0.596600] vgaarb: loaded
...
[    1.266286] efifb: probing for efifb
[    1.266292] pmd_set_huge: Cannot satisfy [mem 0xe0000000-0xe0200000] with a h
uge-page mapping due to MTRR override.
[    1.266304] efifb: framebuffer at 0xe0000000, using 8128k, total 8128k
[    1.266306] efifb: mode is 1920x1080x32, linelength=7680, pages=1
[    1.266307] efifb: scrolling: redraw
[    1.266308] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0
[    1.266434] Console: switching to colour frame buffer device 240x67
[    1.270104] fb0: EFI VGA frame buffer device
...
[    1.820564] checking generic (e0000000 7f0000) vs hw (c4000000 2000000)
[    1.820589] ast 0000:0a:00.0: enabling device (0000 -> 0003)
[    1.820726] ast 0000:0a:00.0: [drm] Using P2A bridge for configuration
[    1.820729] ast 0000:0a:00.0: [drm] AST 2400 detected
[    1.820740] ast 0000:0a:00.0: [drm] Analog VGA only
[    1.820747] ast 0000:0a:00.0: [drm] dram MCLK=408 Mhz type=6 bus_width=16
[    1.821073] [drm] Initialized ast 0.1.0 20120228 for 0000:0a:00.0 on minor 0
[    1.825665] checking generic (e0000000 7f0000) vs hw (0 0)
[    1.825787] ast 0000:0a:00.0: [drm] fb1: astdrmfb frame buffer device
[    1.900752] [drm] amdgpu kernel modesetting enabled.
[    1.900933] amdgpu: CRAT table not found
[    1.900936] amdgpu: Virtual CRAT table created for CPU
[    1.900966] amdgpu: Topology: Add CPU node
[    1.901234] checking generic (e0000000 7f0000) vs hw (e0000000 10000000)
[    1.901242] checking generic (e0000000 7f0000) vs hw (e0000000 10000000)
[    1.901245] fb0: switching to amdgpu from EFI VGA
[    1.901428] Console: switching to colour dummy device 80x25
[    1.901491] amdgpu 0000:81:00.0: vgaarb: deactivate vga console

With best regards,

	Marko