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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - (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]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104064#c30">Comment # 30</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - (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]"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104064">bug 104064</a>
from <span class="vcard"><a class="email" href="mailto:harry.wentland@amd.com" title="Harry Wentland <harry.wentland@amd.com>"> <span class="fn">Harry Wentland</span></a>
</span></b>
<pre>(In reply to taijian from <a href="show_bug.cgi?id=104064#c29">comment #29</a>)
<span class="quote">> 3) There is a new bug, probably introduced by this commit:
> <a href="https://cgit.freedesktop.org/~agd5f/linux/patch/">https://cgit.freedesktop.org/~agd5f/linux/patch/</a>
> ?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].
> </span >
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
<a href="https://cgit.freedesktop.org/~agd5f/linux/tree/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c?h=drm-next-4.17-wip#n3601">https://cgit.freedesktop.org/~agd5f/linux/tree/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c?h=drm-next-4.17-wip#n3601</a>
for more info.
Unfortunately I can't comment on the atpx stuff.
Harry</pre>
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