*** This bug is a duplicate of bug 1399564 ***
    https://bugs.launchpad.net/bugs/1399564

Same problem here:

Ubuntu 14.04 64bits, xfce desktop

Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
Advanced Micro Devices, Inc. [AMD/ATI] RV515/M54 [Mobility Radeon X1400] 

Using the drivers from system.

After a long sleep (~1h), unlock the user session and the screen got
blank.

I send a Ctrl+Alt+supr and session locks again, but what is curious, is
that if I unlock with a different user that has not initiated the
session, the session starts and the screen works perfectly fine.

But the original session is impossible to reactivate, it's necessary
restart xfce4-session.

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

Title:
  black screen after longer screen lock

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