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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Tearing after screen wakeup/on"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103791#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Tearing after screen wakeup/on"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103791">bug 103791</a>
from <span class="vcard"><a class="email" href="mailto:michel@daenzer.net" title="Michel Dänzer <michel@daenzer.net>"> <span class="fn">Michel Dänzer</span></a>
</span></b>
<pre>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?</pre>
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