Comment # 10
on bug 104854
from José Pekkarinen
Created attachment 140293 [details]
dri config to work it around.
I spent some more time toying this around and I found that, building
the drm inside the kernel like in this extract of the config, and
provided that you still blacklist the amdgpu module:
BOOT_IMAGE=/kernel-genkernel-x86_64-4.17.2+ root=/dev/mapper/bee-root ro dolvm
crypt_root=/dev/sda3 real_root=/dev/bee/root resume=/dev/bee/swap iommu=pt
intel_iommu=on kvm-intel.nested=1 apparmor=1 zswap.enabled=1 security=apparmor
crashkernel=256M modprobe.blacklist=amdgpu
The kernel booting will ignore my evil purposes:
# dmesg|grep amdgpu
[ 0.000000] Command line: BOOT_IMAGE=/kernel-genkernel-x86_64-4.17.2+
root=/dev/mapper/bee-root ro dolvm crypt_root=/dev/sda3 real_root=/dev/bee/root
resume=/dev/bee/swap iommu=pt intel_iommu=on kvm-intel.nested=1 apparmor=1
zswap.enabled=1 security=apparmor crashkernel=256M modprobe.blacklist=amdgpu
[ 0.000000] Kernel command line: BOOT_IMAGE=/kernel-genkernel-x86_64-4.17.2+
root=/dev/mapper/bee-root ro dolvm crypt_root=/dev/sda3 real_root=/dev/bee/root
resume=/dev/bee/swap iommu=pt intel_iommu=on kvm-intel.nested=1 apparmor=1
zswap.enabled=1 security=apparmor crashkernel=256M modprobe.blacklist=amdgpu
[ 0.755913] [drm] amdgpu kernel modesetting enabled.
[ 0.756304] amdgpu 0000:01:00.0: enabling device (0400 -> 0403)
[ 0.772792] amdgpu 0000:01:00.0: VRAM: 2048M 0x000000F400000000 -
0x000000F47FFFFFFF (2048M used)
[ 0.773338] amdgpu 0000:01:00.0: GTT: 256M 0x0000000000000000 -
0x000000000FFFFFFF
[ 0.777463] [drm] amdgpu: 2048M of VRAM memory ready
[ 0.778060] [drm] amdgpu: 3072M of GTT memory ready.
[ 0.798170] amdgpu: [powerplay] can't get the mac of 5
[ 0.809732] [drm] Initialized amdgpu 3.25.0 20150101 for 0000:01:00.0 on
minor 0
[ 6.112759] amdgpu: [powerplay] VI should always have 2 performance levels
[ 6.144432] amdgpu 0000:01:00.0: GPU pci config reset
[ 22.024297] amdgpu: [powerplay] can't get the mac of 5
resulting in a properly booted machine that is able to use the amd gpu:
$ DRI_PRIME=1 glxinfo |grep OpenGL
OpenGL vendor string: X.Org
OpenGL renderer string: AMD Radeon (TM) R7 M360 (ICELAND, DRM 3.25.0, 4.17.2+,
LLVM 6.0.0)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 18.1.2
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.1 Mesa 18.1.2
OpenGL shading language version string: 1.40
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.1 Mesa 18.1.2
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.10
OpenGL ES profile extensions:
Technically it seems to be a weird workaround and I don't know if that may
light your bulbs in any way, but hey, I hope it helps.
José.
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