[Bug 104064] (DC 4.15-rc2) WARNING: CPU: 4 PID: 75 at drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:601 dm_suspend+0x4e/0x60 [amdgpu]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104064

--- Comment #30 from Harry Wentland <harry.wentland at amd.com> ---
(In reply to taijian from comment #29)
> 3) There is a new bug, probably introduced by this commit:
> https://cgit.freedesktop.org/~agd5f/linux/patch/
> ?id=7c8c32854566dd9fb2ad4108029670604bc77b19. On hybrid gpu laptops amdgpu
> does not actually control the brightness of the internal screen, because
> that is controlled by the iGPU. So amdgpu should probably not try. Maybe put
> a check in there? There is a crash referenced related to this issue in the
> attached dmesg output, look starting at [10.234751].
> 

The patch you're referencing only applies to legacy display code (dc=0). The
stacktrace you show is with DC display code (dc=1). 

This probably happens because we advertise a backlight device if we have an eDP
connector available, even if it's disconnected. See
https://cgit.freedesktop.org/~agd5f/linux/tree/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c?h=drm-next-4.17-wip#n3601
for more info.

Unfortunately I can't comment on the atpx stuff.

Harry

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