[Nouveau] [Bug 59168] [nvc1/Quardro1000M|nvc3/Quadro2000M] graphic garbage/corruption/noise on resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59168

--- Comment #47 from Doug Brunner <doug.a.brunner at gmail.com> ---
Setting config=PCE1=0 in my modprobe .conf file also fixes the issue for me; I
was able to remove noaccel=1 and still suspend and resume without problems. I
updated to Ubuntu's backported kernel 3.12.2 since my last post (to fix an
unrelated Ethernet issue). I haven't tried that kernel with no nouveau options,
can do so if it would be helpful; I suspect not though, since Laurence Lee
found the issue still existed in 3.14.

(In reply to comment #46)
> Thanks for the command-line tip, that does indeed have the desired effect on
> standard-built Fedora kernels, and is much better than setting
> nouveau.noaccel=1 (which, when activated, is now leading to some
> font-rendering glitches).
> 
> Actually, it does kind of make sense that an invalid copy engine would cause
> screen garbage to be displayed, and that this would be triggered by the
> rapid screen repainting that happens on Resume.
> 
> I'll leave it up to more knowledgeable minds whether to act upon this patch
> or not; but it's worth noting that only 4 other devices out of the 9
> declared in nvc0.c have an entry for a secondary, "COPY1" engine -- the
> GF100, GF104, GF110, and GF114.
> 
> I'm just thankful to have a usable solution on my rig in the meantime.
> Thanks!

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