From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesse Barnes Subject: Re: [Bug #15015] blank screen at random times in laptop when sitting idle Date: Mon, 25 Jan 2010 10:39:17 -0800 Message-ID: <20100125103917.53f75e9a@jbarnes-piketon> References: <84144f021001250610q3160ea06tac5f645b84285388@mail.gmail.com> Mime-Version: 1.0 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="utf-8" To: Manish Katiyar Cc: Pekka Enberg , "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List , Jithin Emmanuel , Andrew Morton , Linus Torvalds On Mon, 25 Jan 2010 20:14:28 +0530 Manish Katiyar wrote: > On Mon, Jan 25, 2010 at 7:40 PM, Pekka Enberg > wrote: > > On Mon, Jan 25, 2010 at 12:23 AM, Rafael J. Wysocki > > wrote: > >> This message has been generated automatically as a part of a repor= t > >> of regressions introduced between 2.6.31 and 2.6.32. > >> > >> The following bug entry is on the current list of known regression= s > >> introduced between 2.6.31 and 2.6.32. =C2=A0Please verify if it st= ill > >> should be listed and let me know (either way). > >> > >> > >> Bug-Entry =C2=A0 =C2=A0 =C2=A0 : http://bugzilla.kernel.org/show_b= ug.cgi?id=3D15015 > >> Subject =C2=A0 =C2=A0 =C2=A0 =C2=A0 : blank screen at random times= in laptop when > >> sitting idle Submitter =C2=A0 =C2=A0 =C2=A0 : Jithin Emmanuel > >> Date =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0: 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. >=20 > 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 goe= s > 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. >=20 > 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. --=20 Jesse Barnes, Intel Open Source Technology Center