X display with Intel i915 driver occasionally goes blank after resume from suspend
Binary package hint: xorg
I have had Ubuntu 10.04 on my laptop (see details in attachments) since September 2010. I have been using kernel modeset. This one has a hybrid Intel/ATI display. I disabled the ATI one and only used the Intel. Here is the relevant lspci output:
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
For a while this laptop suspended and resumed with no problem whatsoever. I use this laptop as a work machine that I suspend/resume often (once or twice a day if not more). Recently (for a few months) the laptop sometimes wake up with a bizzare behavior on the LCD display: it flashes a bright light then the LCD went black. Never to recover until I rebooted the laptop. Trying to suspend and resume again won't help.
The result from dmesg etc came from a fresh reboot, so it might not show anything there.
Once I tried to "scavenge" for debug info or other logged problems when this happened by gathering all the dmesg, /var/log/kern, /var/log/messages or /var/log/Xorg.0.log -- they did not contain anything useful AFAIK. I can attach them if you want.
The difficulty is that this bug would not appear consistently. It only appears randomly and I can't tell when it would happen. I am filing this bug report just in case other Thinkpad users with intel integrated graphics also experienced similar problem (or if it has been reported elsewhere). I have a suspicion that perhaps some kernel update in the past caused this bug, since it never happened before.
Another point to consider: from time to time I would use xrandr to duplicate or extend the display to external VGA projector. (`xrandr -q' is usually all I did and the magic is done). Not sure if this has to do with the problem said above.
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
Uname: Linux 2.6.32-31-generic x86_64
Date: Thu May 5 11:47:45 2011
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
MachineType: LENOVO 2764CTO
no product info available
dmi.bios.version: 7UET50WW (1.20 )
dmi.board.version: Not Available
glxinfo: Error: [Errno 2] No such file or directory
|affects:||xorg (Ubuntu) → xserver-xorg-video-intel (Ubuntu)|