nouveau graphical corruption in 3.13.2 (original) (raw)

Daniel J Blueman daniel at quora.org
Sat Feb 22 19:45:02 PST 2014

On 9 February 2014 02:57, Ilia Mirkin <imirkin at alum.mit.edu> wrote:

On Sat, Feb 8, 2014 at 10:38 AM, Daniel J Blueman <daniel at quora.org> wrote:

Interestingly, there was graphical failure booting 3.6.11, even nvidia-current fails to initialise, but these two issues could be due to running the Xorg stack in Ubuntu 14.04 pre-release. Using nouveau.noaccel=1 works great for the first X session, but after logging out, lightdm and the next session experiences this consistent screen corruption:

http://quora.org/nouveau-corruption.jpg Does that just happen in 3.6.11 or even in 3.13? If the latter, that. points to some key lack of understanding of... something. With noaccel, we're not using pgraph or anything fancy -- it's just a framebuffer, basically. So if we can't even render that right... Hopefully someone else will pipe up re your other issues -- my knowledge base on this is exhausted :(

Interestingly, it turns out that the screen corruption occurs on every boot (booting with nouveau.noaccel=1 for now), and I can consistently work around it by one suspend-resume cycle.

To that effect, I've captured kernel message output booting 3.14-rc3 with 'nouveau.noaccel=1 nouveau.debug=trace,DEVINIT=spam drm.debug=0x6 log_buf_len=16M', and performed a suspend-resume cycle: http://quora.org/nouveau-log.txt

Ben et al, would some specific register tracing or otherwise help to locate the issue?

Daniel J Blueman

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