Comment 99 for bug 681054

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