Hmm, ok reason I ask is looking at your Xorg.0.log everything looks totally bog standard except at the end there are 9 sequences of XRANDR queries to the monitor. Those queries can typically cause screen flickers such as what you're seeing. And it is not unprecedented for some arbitrary client application to set up polling calls of X server such as to check if a new monitor is installed; on some hardware this works without flicker, on some it does. This behavior is typically highly periodic, such as you're seeing. A way to check if this is the case would be to review what processes you have running (e.g. look at ps aux) and one by one shut them down until the blanking stops.
The other typical cause of blanking issues like this is underruns of the GPU. Basically, X is not able to feed data through to your graphics card fast enough. Often when this happens, there are error messages printed to dmesg and/or Xorg.0.log, yet this does not appear in your logs. Also, this problem tends to be intermittent/random rather than periodic. -- 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: screen repeatedly goes black for a fraction of a second -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
