linux-kernel - Re: [Regression 2] i915: Commit 0d9c778978 causes flickering in 2.6.32

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Message-ID: <4B20DB2C.5040404@xenontk.org>
Date:	Thu, 10 Dec 2009 16:57:40 +0530
From:	David John <davidjon@...ontk.org>
To:	chris@...is-wilson.co.uk
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>, eric@...olt.net,
	airlied@...il.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	hohndel@...radead.org
Subject: Re: [Regression 2] i915: Commit 0d9c778978 causes flickering in 2.6.32

On 12/09/2009 10:44 PM, David John wrote:
> Hi All,
> 
> I have a Dell Inspiron with a GM45 Express chipset and an Acer 23"
> display connected to the VGA out. I switch off the internal LVDS LCD
> on X start-up with xrandr. X works fine but if I switch to a console,
> it flickers horribly with the text all pushed to the right. Switching
> back to X causes X to start flickering as well. Turning the internal
> LVDS back _on_ solves the issue. It works like a switch so it is easily
> reproducible. Reverting commit 0e442c60 also fixes the problem.
> 
> There isn't anything unusual in the kernel or X logs that I could see,
> but they're attached.
> 
> Regards,
> David.

Hi,

Reverting the above commit fixes 95% of the problem, the console no
longer flickers. However, the same sequence: Switch off LVDS->
Switch to console->Switch back to X causes slight flicker in X with
the commit 0d9c778978. Turning the internal LVDS back on solves the
issue. Reverting commit 0d9c778978 fixes the problem completely (Both
commits have to be reverted).

Regards,
David.

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