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

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Date:	Mon, 25 Jan 2010 21:50:29 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Manish Katiyar <mkatiyar@...il.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	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 Monday 25 January 2010, Jesse Barnes wrote:
> 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.

Thanks for taking care of this.

Rafael
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