On Monday, March 21, 2011, Herton Ronaldo Krzesinski wrote: > On Sat, Mar 19, 2011 at 09:52:52PM +0100, Rafael J. Wysocki wrote: > > On Saturday, March 19, 2011, Herton Ronaldo Krzesinski wrote: > > > On Fri, Mar 18, 2011 at 11:38:52PM +0100, Rafael J. Wysocki wrote: > > > > On Friday, March 18, 2011, Herton Ronaldo Krzesinski wrote: > > > > > This regression is old, but discovered recently. Since 2.6.34-rc4, > > > > > a Toshiba Tecra A11 machine resumes without video for the first time. > > > > > Here is the strange thing reported, on the first suspend/resume, when > > > > > the machine wakes up the video is blank, but the machine is up (just the > > > > > screen is black). If you suspend again, on second resume the video comes > > > > > back normally. > > > > > > > > > > Helping the reporter bisecting the problem, we narrowed down the bug to > > > > > this commit: > > > > > > > > > > commit ac7729da880e742613129ee6dea0045328670d2d > > > > > Author: Rafael J. Wysocki <rjw@xxxxxxx> > > > > > Date: Mon Apr 5 01:43:51 2010 +0200 > > > > > > > > > > ACPI / PM: Move ACPI video resume to a PM notifier > > > > > > > > > > And reverting this commit on 2.6.38 still made the problem go away. > > > > > Looking at the commit above I don't saw any problem, and perhaps we have > > > > > some bad bios here which by moving the resume of acpi video later > > > > > triggers this bug. Also strange that on second suspend/resume everything > > > > > is normal... (the regression here is just the video is blank on first > > > > > resume). > > > > > > > > > > I asked the reporter to try to increase brightness logged in remotely > > > > > when the video is blank after first resume, but this didn't have any > > > > > effect. > > > > > > > > > > This was reported in https://bugs.launchpad.net/bugs/719620 (if reading > > > > > I recommend to skip to comment #58 and later), I can't think of any > > > > > solution besides trying to move acpi video resume perhaps back and > > > > > depend on video device being resume first. I asked for more debugging > > > > > information but got nothing unfortunately which could diagnose better > > > > > this... > > > > > > > > What graphics driver is used? > > > > > > i915 > > > > In the KMS mode I guess? > > Yes, in KMS mode. OK, I have no idea how to fix this. Matthew, can you please have a look here? Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
