linux-kernel - Re: 2.6.31 -> 2.6.32 Sound and video regressions

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Date:	Sun, 6 Dec 2009 17:32:22 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Darren Salt <linux@...mustbejoking.demon.co.uk>
Cc:	linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
	luto@...ealbox.com, benisty.e@...il.com
Subject: Re: 2.6.31 -> 2.6.32 Sound and video regressions

On Sat, 05 Dec 2009 23:44:55 +0000
Darren Salt <linux@...mustbejoking.demon.co.uk> wrote:

> I demand that Andy Lutomirski may or may not have written...
> 
> > Emmanuel Benisty wrote:
> [snip]
> >> I just wanted to report 2 regressions I am having now with 2.6.32.
> >> Video
> >> Screen is flickering/glitching like crazy in X. It happens whether
> >> randomly or when conky is refreshed, when the mouse cursor moves
> >> and like hell when a page is loading in the browser. Not so easy to
> >> describe this issue.
> [snip]
> 
> > That sounds like FIFO underruns, which (I think) were introduced
> > when self-refresh was enabled but should have been fixed. I
> > personally have no clue how to fix them, but if you told the Intel
> > people what kind of chip you have (lspci output), they can probably
> > fix it.
> 
> It also sounds like what I'm seeing on my EeePC 901. It only happens
> after resume, which makes STR a little less than useful; the display
> will, sooner or later, show a single colour (which is, presumably,
> the result of a display engine hang, as described in the comment
> immediately before intel_calculate_wm) and, seemingly, be stuck like
> that until power-off or reboot.
> 
> Whether it *is* the same problem, I couldn't say.
> 
> Needless to say, this problem goes away if I disable KMS.

Arg, there are a few reports of this now, but I haven't been able to
reproduce it.  I'll try harder...  (FYI the upstream
bugs.freedesktop.org # for it is 24314).

-- 
Jesse Barnes, Intel Open Source Technology Center
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