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Date:	Fri, 20 Jun 2014 07:59:04 +1000
From:	Dave Airlie <>
To:	"Theodore Ts'o" <>,
	LKML <>,
	"" <>
Subject: Re: [Intel-gfx] Display glitching (and possibly related lockup) in 3.16-rc1?

On 20 June 2014 02:09, Daniel Vetter <> wrote:
> On Wed, Jun 18, 2014 at 12:14:55PM -0400, Theodore Ts'o wrote:
>> Is this a known problem?
>> On my T540p, occasionally the display will go black and then be
>> completely locked.  One time when this happened, the display started
>> glitching and tearing (like what you might see if an analog display had
>> a loose connector and it was being wiggled) when the system locked up,
>> but the at least 75% of the time when the bug manifests, the screen goes
>> black instead.
>> This appears to only happen when the system is running on battery --- it
>> doesn't seem to manifest if I'm plugged into the AC mains.  And I've
>> been typing an e-mail message when the system locks up, so I don't think
>> it's related to DPMS or the screen saver kicking in.
>> I can try to bisect this regression (3.15 didn't have this problem), but
>> I thought I would ask first if this was a known problem.   I don't know
>> for certain that it's an i915 bug, but the symptoms do somewhat point in
>> that direction, especially the display glitches.
> Doesn't ring a bell, but can you please boot with drm.debug=0xe and attach
> dmesg here so we know what kind of hardware you have? Also any dying
> breadths over netconsole or similar? Can't hurt to check that before doing
> the bisect.

t540p are haswell.

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