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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - 4K Display on Displayport goes black when pointer hits column 0"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94643#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - 4K Display on Displayport goes black when pointer hits column 0"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94643">bug 94643</a>
from <span class="vcard"><a class="email" href="mailto:rmu@unfoo.net" title="Robert Schöftner <rmu@unfoo.net>"> <span class="fn">Robert Schöftner</span></a>
</span></b>
<pre>I already had a quick look for "obvious" off-by-one-errors in
linux/drivers/gpu/drm/nouveau, following nv50_crtc_cursor_move, the but of
course I didn't find any.
Usually the GPU does not go completely bonkers, the LVDS-connected display of
the laptop continues to display a screen and usually remains completely
useable.
I also tried enabling "SWcursor", but that leads to completely black screen and
unuseable X, even with only internal display, which I probably should report as
a separate bug.
If somebody has an idea where to look, I'm quite capable of compiling and
testing patched nouveau kernel and userspace drivers.
Would something like mmiotrace be helpful or a waste of time?</pre>
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