Can you switch to another screen locker (probably xscreensaver) and see if the problem still occurs?
The light-locker fix for bug 1307545 may require tweaking to cover some corner case which still triggers the black screen issue.
Can you switch to another screen locker (probably xscreensaver) and see if the problem still occurs?
The light-locker fix for bug 1307545 may require tweaking to cover some corner case which still triggers the black screen issue.