[Nouveau] [Bug 94643] 4K Display on Displayport goes black when pointer hits column 0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94643

--- Comment #5 from Robert Schöftner <rmu at unfoo.net> ---
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?

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