Comment # 4
on bug 103791
from Michel Dänzer
We need to find out why the kernel starts returning -EINVAL from the page flip and wait for vblank ioctls. Can you try writing 255 to /sys/module/drm/parameters/debug before reproducing the problem, and attach the resulting dmesg output? (Note that writing non-0 to /sys/module/drm/parameters/debug will cause a lot of debugging output to be generated, so you'll want to write 0 to it again soon afterwards) In case that doesn't reveal why -EINVAL is being returned, are you able to recompile the drm.ko / amdgpu.ko kernel modules with a patch applied?
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