Launchpad has imported 8 comments from the remote bug at https://bugs.freedesktop.org/show_bug.cgi?id=37526.
If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. ------------------------------------------------------------------------ On 2011-05-24T02:50:54+00:00 Bryce Harrington wrote: Forwarding this bug from Ubuntu reporter Cobalt: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/681054 [Problem] Very brief periodic screen blanking every couple seconds. Regression began in 10.10 and continues in 11.04. Reporter has been testing upstream git snapshots and finds problem still persists. [Original Description] Since I upgraded from Ubuntu 10.04 to 10.10, the monitor displays correctly for a couple of seconds, then turns black for a fraction of a second and then repeats the on and off sequence, making the computer nearly unusable. The whole sequence is periodic, not random. Another bug reported earlier (#606987) persists in this release as well, perhaps with the exception that restarting the computer (as opposed to turning it on after a shutdown) gives a normal logon screen. (I only used Restart a couple of times since the upgrade.) With a live CD for natty, the display is fine up to the screen where I am shown the menu that includes using Ubuntu without installing. Once I choose this option the display changes and the name ubuntu appears, underscored by five dots whose color changes from white to red and back to show that the computer is doing work. It is there that the screen starts to blink. I have only one monitor, although at some level - at least for maverick and older versions - the computer seems to think that I have two. This is probably at least part of the cause of the other bug (#606987) I mentioned in the original description of this problem. Thanks and regards DistUpgraded: Fresh install GraphicsCard: Subsystem: ASUSTeK Computer Inc. Device [1043:82d9] Subsystem: ASUSTeK Computer Inc. Device [1043:82d9] MachineType: ASUSTeK Computer INC. NOVALITE PX20 version.compiz: compiz 1:0.9.2.1+glibmainloop4-0ubuntu11 version.libdrm2: libdrm2 2.4.23-1ubuntu3 version.libgl1-mesa-glx: libgl1-mesa-glx 7.10-1ubuntu1 version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu4 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.13.2+git20110124.fadee040-0ubuntu4 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-1ubuntu7 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu4 Architecture: i386 DistroRelease: Ubuntu 11.04 LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110405) Package: xserver-xorg-video-intel 2:2.14.0-4ubuntu6 PackageArchitecture: i386 Uname: Linux 2.6.38-7-generic i686 [lspci] Nux: lspci: 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller [8086:2592] (r Reply at: https://bugs.launchpad.net/xserver-xorg-video- intel/+bug/681054/comments/93 ------------------------------------------------------------------------ On 2011-05-24T02:52:25+00:00 Bryce Harrington wrote: Created attachment 47083 BootDmesg.txt Reply at: https://bugs.launchpad.net/xserver-xorg-video- intel/+bug/681054/comments/94 ------------------------------------------------------------------------ On 2011-05-24T02:52:54+00:00 Bryce Harrington wrote: Created attachment 47084 CurrentDmesg.txt Reply at: https://bugs.launchpad.net/xserver-xorg-video- intel/+bug/681054/comments/95 ------------------------------------------------------------------------ On 2011-05-24T02:55:29+00:00 Bryce Harrington wrote: Created attachment 47085 XorgLog.txt Reply at: https://bugs.launchpad.net/xserver-xorg-video- intel/+bug/681054/comments/96 ------------------------------------------------------------------------ On 2011-05-25T15:20:11+00:00 Chris Wilson wrote: There are too many possible factors; from output polling to fbc and fifos. Can we identify when the regression was introduced? Reply at: https://bugs.launchpad.net/xserver-xorg-video- intel/+bug/681054/comments/98 ------------------------------------------------------------------------ On 2011-06-16T10:35:39+00:00 Chris Wilson wrote: The workaround will be echo 0 > /sys/module/drm_kms_helper/parameters/poll. But that won't tell us why the periodic polling is causing the output to blank... Load detection on the VGA should be possible with the current mode settings, and the VGA crtc should not be stolen for any other load detections (TV). Reply at: https://bugs.launchpad.net/xserver-xorg-video- intel/+bug/681054/comments/99 ------------------------------------------------------------------------ On 2011-07-18T15:06:07+00:00 Chris Wilson wrote: The workaround would be to disable polling (drm_kms_helper.poll=0). Improving the locking around modesetting is a longer term issue, but I think the fundamental issue is more likely to a FIFO starvation when doing load-detection on the second pipe. Which falls into the DSPARB terroritory. A full drm.debug=0xe dmesg for boot-up + blanking period would help. (Reducing priority, not going to be fixed in the immediate term.) Reply at: https://bugs.launchpad.net/xserver-xorg-video- intel/+bug/681054/comments/100 ------------------------------------------------------------------------ On 2012-02-04T01:17:05+00:00 Bryce Harrington wrote: Created attachment 56587 dmesg.txt Reply at: https://bugs.launchpad.net/xserver-xorg-video- intel/+bug/681054/comments/106 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/681054 Title: [i915gm] screen repeatedly goes black for a fraction of a second (two monitors detected?) To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/681054/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
