*** This bug is a duplicate of bug 88152 ***
https://bugs.launchpad.net/bugs/88152
Hey Bingo YOU rock! How about that? I'll just subscribe you so you see
this reply though (you may want to unsubscribe yourself from this bug to
avoid seeing replies).
As to your query, sync to vblank is there to stop tearing (at the cost
of speed). Your monitor has a refresh rate and if things are not timed
to be in sync with when a vertical blank takes place you can get tearing
(imagine you have a black screen and you go to draw a white cube. If for
whatever reason you can't draw the screen with the cube in less than the
time it takes to refresh or you are unlucky then you will end up with
half a cube at the bottom and a black screen at the top). See
http://www.mythtv.org/wiki/index.php/Frame_display_timing for a better
description.
(PS: if you want to see replies it is best to subscribe yourself to the
bug you pose the question in)
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[nvidia-glx][nvidia-glx-new] black/blank screen on resume after
suspend/hibernate/vt switch when using compiz/beryl/desktop effects unless sync
to vblank is disabled
https://bugs.launchpad.net/bugs/96240
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