Re: 2.6.31 -> 2.6.32 Sound and video regressions

[Emmanuel Benisty <benisty.e@gmail.com>]

On Mon, Dec 7, 2009 at 8:38 PM, Emmanuel Benisty <benisty.e@gmail.com> wrote:
> On Mon, Dec 7, 2009 at 10:52 AM, Emmanuel Benisty <benisty.e@gmail.com> wrote:
>> On Mon, Dec 7, 2009 at 8:32 AM, Jesse Barnes <jbarnes@virtuousgeek.org> wrote:
>>> On Sat, 05 Dec 2009 23:44:55 +0000
>>> Darren Salt <linux@youmustbejoking.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