ubuntu-x-swat team mailing list archive

[Bryce Harrington <681054@xxxxxxxxxxxxxxxxxx>]

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.

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https://bugs.launchpad.net/bugs/681054

Title:
  screen repeatedly goes black for a fraction of a second