Indeed, I can confirm that with the recently released stable 295.20
driver version the problem went away and no more hangs are experienced
after resume and the desktop is immediately responsive.

Switching to the console and back also works fine, although there seems
to be one buglet left:

Switching forth and back to the console and the X server requires the
triggering of a full redraw (e.g. by switching to another virtual
desktop) in order to restore the full desktop properly from an initially
black image.

Upon resume and after logging in, there are some graphics artifacts
(graphics memory corruption?) at the area where the unhidden dock would
reside. Once an action overdraws that screen area (the dock is unhidden
or a full refresh is triggered) everything is back to normal.

Not sure, if this is something that is supposed to be taken care of by
the driver or by the compositing manager.

Thx a lot for the fix of the modeswitch hang, though, which works
beautifully again.

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https://bugs.launchpad.net/bugs/933212

Title:
  FBO-using applications unresponsive for a long time after modeswitch

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