Forwarding this bug from Ubuntu reporter Giovanni Condello: https://bugs.edge.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/397839 [Problem] Sometimes the internal laptop display (LVDS) goes off (like a DPMS standby) for no reason (there is user activity going on). Moving the mouse or typing on the keyboard makes the screen turn on again (no password request or user logout happens) This happens on a fully updated Karmic with a mobility radeon X700 using the standard radeon driver. [lspci] 00:00.0 Host bridge [0600]: Intel Corporation Mobile 915GM/PM/GMS/910GML Express Processor to DRAM Controller [8086:2590] (rev 03) Subsystem: Acer Incorporated [ALI] Device [1025:0066] 01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Radeon Mobility X700 (PCIE) [1002:5653] Subsystem: Acer Incorporated [ALI] Device [1025:0066] [More Info] ProblemType: Bug Architecture: i386 Date: Fri Jul 10 15:11:22 2009 DistroRelease: Ubuntu 9.10 Lsusb: Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Acer, inc. Yspire 1690 Package: xserver-xorg-video-ati 1:6.12.99+git20090629.f39cafc5-0ubuntu1 ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-2-generic root=UUID=79c83fad-2c20-4754-b080-8a8e9e451b51 ro quiet splash ProcEnviron: LANG=it_IT.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 2.6.31-2.16-generic RelatedPackageVersions: xserver-xorg 1:7.4+3ubuntu5 libgl1-mesa-glx 7.5~rc4-1ubuntu3 libdrm2 2.4.11-1ubuntu1 xserver-xorg-video-intel 2:2.7.99.901+git20090702.74227141-0ubuntu1 xserver-xorg-video-ati 1:6.12.99+git20090629.f39cafc5-0ubuntu1 SourcePackage: xserver-xorg-video-ati Uname: Linux 2.6.31-2-generic i686 dmi.bios.date: 03/14/06 dmi.bios.vendor: Acer dmi.bios.version: 3A44 dmi.board.name: Crane II dmi.board.vendor: Acer, Inc. dmi.board.version: Not Applicable dmi.chassis.type: 1 dmi.chassis.vendor: , Inc. dmi.chassis.version: N/A dmi.modalias: dmi:bvnAcer:bvr3A44:bd03/14/06:svnAcer,inc.:pnYspire1690:pvrNotApplicable:rvnAcer,Inc.:rnCraneII:rvrNotApplicable:cvn,Inc.:ct1:cvrN/A: dmi.product.name: Yspire 1690 dmi.product.version: Not Applicable dmi.sys.vendor: Acer, inc. fglrx: Not loaded system: distro: Ubuntu architecture: i686kernel: 2.6.31-2-generic
Created attachment 28235 [details] BootDmesg.txt
Created attachment 28236 [details] CurrentDmesg.txt
Created attachment 28237 [details] XorgLog.txt
Fwiw, I've also been noticing similar behavior on my own -ati system, although the message I see in my Xorg.0.log is different. Since it seems to have some relation to the dpms power management, I've not been sure whether it is X or something deeper in the platform stuff. Any pointers would be much appreciated, as I've had a lot of different people mention this issue to me.
This sounds like a problem with the xserver dpms timer or gpm or whatever you are using to control the dpms timeout. If you see things like: disable LVDS enable LVDS in your log when it happens, then some external event is causing the driver's dpms function to be called. Some other possible causes include video apps that fiddle with the dpms state to keep the screensaver from kicking in, or in the case of a momentary blanking of the screen on older cards, apps that query the randr state on a regular basis.
FWIW I have the same bug on two Intel video machines
https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/397839/comments/11 Looks like it was an issue accidentally introduced in xserver and accidentally fixed as well recently
Closing this bug
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.