linux-kernel - Re: [Bug #15015] blank screen at random times in laptop when sitting idle

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Message-ID: <20100125103917.53f75e9a@jbarnes-piketon>
Date:	Mon, 25 Jan 2010 10:39:17 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Manish Katiyar <mkatiyar@...il.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Jithin Emmanuel <jithin1987@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [Bug #15015] blank screen at random times in laptop when
 sitting  idle

On Mon, 25 Jan 2010 20:14:28 +0530
Manish Katiyar <mkatiyar@...il.com> wrote:

> On Mon, Jan 25, 2010 at 7:40 PM, Pekka Enberg
> <penberg@...helsinki.fi> wrote:
> > On Mon, Jan 25, 2010 at 12:23 AM, Rafael J. Wysocki <rjw@...k.pl>
> > wrote:
> >> This message has been generated automatically as a part of a report
> >> of regressions introduced between 2.6.31 and 2.6.32.
> >>
> >> The following bug entry is on the current list of known regressions
> >> introduced between 2.6.31 and 2.6.32.  Please verify if it still
> >> should be listed and let me know (either way).
> >>
> >>
> >> Bug-Entry       : http://bugzilla.kernel.org/show_bug.cgi?id=15015
> >> Subject         : blank screen at random times in laptop when
> >> sitting idle Submitter       : Jithin Emmanuel
> >> <jithin1987@...il.com> Date            : 2010-01-09 16:48 (16 days
> >> old)
> >
> > FWIW, I might have seen this on my Macbook as well (screen went
> > blank but I didn't check the logs). I think I managed to unblank
> > the screen by hitting the "increase brightness" key. But as you
> > say, the bug doesn't trigger very often and I have no idea how to
> > reproduce it at will.
> 
> I have seen it too on my lenovo T60 with 2.6.32.2. It happens to me
> frequently and has become famous as "coffee bug" in my colleagues.
> Every morning when I goto office and after putting my laptop on
> docking station go for coffee. Once I come back the laptop screen goes
> blank, but haven't been able to manage how to get screen back. Only
> option is hard reboot. This happens almost every once in two three
> days.
> 
> Let me know what information/logs I can provide to help debug this.
> BTW I normally suspend my laptop at home and then resume it in office
> (if that matters).

Ouch, looks like our DPMS path is failing pretty hard.  I'll add some
folks to cc, hopefully it'll be easy to track down.


-- 
Jesse Barnes, Intel Open Source Technology Center
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