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

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Message-ID: <20100904224453.GA31664@sucs.org>
Date:	Sat, 4 Sep 2010 23:44:53 +0100
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	Sven Joachim <svenjoac@....de>
Cc:	Hugh Dickins <hughd@...gle.com>, 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>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] Revert "drm/i915: fix vblank wait test condition"

On Sat, Sep 04, 2010 at 10:42:46PM +0200, 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!

Sadly this doesn't help my EeePC 900 with an i915 when it is booted with
a battery inside or after doing a suspend to ram (running
modetest/xrandr in these situations says VGA is connected when there
isn't even a cable attached).

-- 
Sitsofe | http://sucs.org/~sits/
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