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
