first of all, i have disabled suspend since it does not work with my
hardware, so it's not a wake/thaw issue.

regarding "longer period": (1) tested up to an hour and it unlocks
although after longer time the desktop redraw is slow (even the pointer
looks kinda spritey). i guess this is caused by heavy swapping that's
why i suspect a memory leak. (2) today i have closed the lid (note: no
suspend/hibernate) in the morning and when i came back after more than
10 hours, again, i get a normal login screen with my icon but after
login the screen switches (flashing briefly the nvidia logo) to black
and nothing else. there is no crash, the desktop stuff seems to be
running normaly, i can hear skype sounds and browser burning cpu on some
ads etc. the only way out is reboot or X kill...

will install the xubuntu-dev ppa now...

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https://bugs.launchpad.net/bugs/1320989

Title:
  black screen after longer screen lock

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