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

Jesse Barnes
2010-01-25T18:39:17Z

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

> On Mon, Jan 25, 2010 at 7:40 PM, Pekka Enberg
> <penberg@cs.helsinki.fi> wrote:
> > On Mon, Jan 25, 2010 at 12:23 AM, Rafael J. Wysocki <rjw@sisk.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@gmail.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