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

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Message-ID: <87vd6ls0jd.fsf@turtle.gmx.de>
Date:	Sat, 04 Sep 2010 22:42:46 +0200
From:	Sven Joachim <svenjoac@....de>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Pekka Enberg <penberg@...nel.org>,
	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 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!

Sven
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