linux-kernel - Re: Linux 2.6.35-rc2

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Date:	Mon, 7 Jun 2010 02:23:18 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.35-rc2

On Mon, Jun 7, 2010 at 2:09 AM, Torsten Kaiser
<just.for.lkml@...glemail.com> wrote:
> On Mon, Jun 7, 2010 at 7:58 AM, Alex Deucher <alexdeucher@...il.com> wrote:
>> On Sun, Jun 6, 2010 at 11:04 AM, Torsten Kaiser
>> <just.for.lkml@...glemail.com> wrote:
>>> [CC:Jeff+Tejun not removed, because you might want to look at the
>>> attached dmesgs]
>>>
>>> On Sun, Jun 6, 2010 at 4:19 PM, Linus Torvalds
>>> <torvalds@...ux-foundation.org> wrote:
>>>> On Sun, 6 Jun 2010, Torsten Kaiser wrote:
>>>>>
>>>>> The first problem that shows up is, that after the KMS switches to the
>>>>> correct video mode (1280x1024 for an DVI attached LCD), the display
>>>>> begins to flicker. Every 1..2 seconds (guesstimated) the display turns
>>>>> off and on again. Something in the new powersaving?
>>>>
>>>> Or maybe a borderline display timing that the display has trouble syncing
>>>> up with?
>>>
>>> With 2.6.34 and any previous KMS kernels the output was always stable.
>>> (I think, I switch to the radeon KMS on 2.6.32)
>>> The onscreen menu of the monitor showed 1280x1024@...2Hz for
>>> 2.6.35-rc2, if I recall correctly.
>>> Now back on 2.6.34 its 1280x1024@...9Hz.
>>
>> The pm code shouldn't have any affect as your system only has one
>> power state, so it never kicks in.  It sounds like a display pll
>> problem, but there haven't been any changes to that code since 2.6.34.
>>  Any chance you could bisect it?
>
> Not really. -rc1 did not boot for me (although if I disable v4l that
> might work), and there is this memory corruption error.
>
> Regarding the PLLs, did you see this mail? It contains the
> drm.debug=15 output from 2.6.34 and 2.6.35-rc2.
> http://lkml.org/lkml/2010/6/6/126
>
> The debug output from radeon_set_pll looks identical. But in 2.6.35 a
> call to [drm:radeon_legacy_tmds_int_dpms], seems new.
>
> The switchoff intervall is ~10 seconds, not 1..2 as I guessed in the first mail.
> Any idea if there is something in the KMS code that triggers at this intervall?
>

Sounds like the output polling that gets done when no displays are
detected, but that shouldn't kick in if there is something connected.

Alex

> Torsten
>
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