linux-kernel - Re: [PATCH] Revert "drm/i915: fix vblank wait test condition"

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Message-ID: <4C83C124.8050408@kernel.org>
Date:	Sun, 05 Sep 2010 19:11:16 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Sven Joachim <svenjoac@....de>
CC:	Hugh Dickins <hughd@...gle.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sitsofe Wheeler <sitsofe@...oo.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] Revert "drm/i915: fix vblank wait test condition"

  On 4.9.2010 23.42, Sven Joachim wrote:
> On 2010-09-04 21:54 +0200, Hugh Dickins wrote:
>
>> On Sat, 4 Sep 2010, Pekka Enberg wrote:
>>> On Sat,  4 Sep 2010 11:17:14 +0300, Pekka Enberg<penberg@...nel.org>  wrote:
>>>>> This reverts commit 9559fcdbff4f93d29af04478bbc48294519424f5. The commit causes
>>>>> wrong screen resolution on some i915 machines such as MacBook which is a
>>>>> regression from 2.6.35. The issue has been reported multiple times but no fix
>>>>> has emerged:
>>> On Sat, Sep 4, 2010 at 12:21 PM, Chris Wilson<chris@...is-wilson.co.uk>  wrote:
>>>> NAK. You can't simply hide one bug by introducing a much bigger one.
>>> Dude, it's a nasty regression from 2.6.35. What exactly are you NAK'ing here?
>>>
>>>> As you have an affected machine, find which wait_for_vblank() needs to be
>>>> replaced with a msleep(20|50).
>>> The attached patch fixes things here. I'm not a drm developer so I
>>> don't know if it makes technical sense.
>> Many thanks to you, Pekka: I also don't know if it makes technical sense,
>> but it solves the same issue for me, so I can at last use 2.6.36-rc on
>> this laptop.
> Helps for me as well, but I cannot judge whether it makes technical
> sense either.  Thanks, Pekka!
Is someone picking this patch up or am I supposed to send it to Linus?

             Pekka

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