[Bug 206225] nouveau: Screen distortion and lockup on resume

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=206225

--- Comment #7 from Christoph Marz (derchiller-foren at online.de) ---
(In reply to Ilia Mirkin from comment #6)
> I see you have nouveau.config=PCRYPT=0 in your kernel config. Why did you
> add this -- was there some kind of issue with the engine? Did someone in
> #nouveau tell you to do it to help some issue?

Hello Ilia,

I had found a bug report (https://bugs.freedesktop.org/show_bug.cgi?id=58378)
dealing with a similar issue, and there you suggested to try that option
(https://bugs.freedesktop.org/show_bug.cgi?id=58378#c46), and it seemingly
solved the issue, so I gave it a try, but removed it after I noticed that it
had no effect at all.

>It's normally used for copy
> acceleration on G96 (which would, in turn, be used to copy off any vram data
> to ram on suspend).
> 
> The reason I ask is that starting with kernel 4.3, that will no longer have
> the effect of disabling PCRYPT. The new config to achieve that would be
> nouveau.config=cipher=0.

Ok, thanks for clarification. Copy acceleration sounds good, is there any
downside?

> Note that for G96, I don't think anything in firmware-misc-nonfree would
> affect it either way.

I will uninstall that package and report back.

BTW: No problems with 5.4.13 so far.

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