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1b1ed1a
(Get the code!)
This bug report looks like what I have experienced on my system. I want to distinguish this from other bug reports about blank screens or blank screens. With this bug the entire screen is black but the cursor is still visible and the desktop still works. I have only had this happen after leaving the computer for an extended period though it doesn't happen every time I leave the computer for an extended period. The screensaver has activated and the desktop has locked. When this happened this morning I was able to verify that despite no login box being visible I was able to log in and my mouse cursor reflected my desktop contents (namely that the cursor changed to reflect the google map that had been on my desktop the night before). This is using "gnome classic with effects" and I believe it to be a bug with the Intel video driver. This bug may be misdiagnosed as people may not realize their desktop is still responsive.
This is not the same as bugs 780653 or 762918 as they have been reported though some people commenting to those bugs may actually have this issue. This issue may also be related to those issues.
I mean to try the following suggestions next time:
sudo pkill X
or
sudo killall -w -s KILL compiz
DISPLAY=:0.0 compiz --replace