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

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Message-ID: <20091210095422.3c5a75d1@jbarnes-piketon>
Date:	Thu, 10 Dec 2009 09:54:22 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Emmanuel Benisty <benisty.e@...il.com>
Cc:	Darren Salt <linux@...mustbejoking.demon.co.uk>,
	linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
	luto@...ealbox.com, eric@...olt.net
Subject: Re: 2.6.31 -> 2.6.32 Sound and video regressions

On Tue, 8 Dec 2009 20:20:07 +0700
Emmanuel Benisty <benisty.e@...il.com> wrote:

> On Mon, Dec 7, 2009 at 8:38 PM, Emmanuel Benisty
> <benisty.e@...il.com> wrote:
> > On Mon, Dec 7, 2009 at 10:52 AM, Emmanuel Benisty
> > <benisty.e@...il.com> wrote:
> >> On Mon, Dec 7, 2009 at 8:32 AM, Jesse Barnes
> >> <jbarnes@...tuousgeek.org> wrote:
> >>> 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).
> >>
> >> It *seems* that we are facing two different issues here (I don't
> >> even use S2R and the problem is there since the very first second
> >> I start X). Anyway, I have bisected the problem on my box, it
> >> turns out to be this one:
> >>
> >> drm/i915: Fix render reclock availability detection
> >>
> >> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=181a5336d6cc836f05507410d66988c483ad0154
> >>
> > So, I have reverted this commit and rebuilt 2.6.32. It completely
> > solved the issue described in my first post.
> >
> 
> just FTR, it looks like I'm not alone:
> http://forums.gentoo.org/viewtopic-p-6087556.html#6087556

Great, thanks for narrowing it down.  I'll see if I can come up with a
fix.

-- 
Jesse Barnes, Intel Open Source Technology Center
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