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Date:	Sun, 23 Feb 2014 11:45:02 +0800
From:	Daniel J Blueman <>
To:	Ilia Mirkin <>,
	Ben Skeggs <>, Dave Airlie <>
Cc:	"" <>,
	"" <>,
	Linux Kernel <>,
	Maarten Lankhorst <>,
	Marcin Slusarz <>
Subject: Re: nouveau graphical corruption in 3.13.2

On 9 February 2014 02:57, Ilia Mirkin <> wrote:
> On Sat, Feb 8, 2014 at 10:38 AM, Daniel J Blueman <> 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:
> 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:

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