On elementary OS 0.3 Freya (64-bit), sometimes, when I lock my computer, my computer becomes unresponsive and all I get is a black screen.

[George Plymale II]

Sometimes, when I lock my computer, the whole system becomes unresponsive and all I have is a black screen. Not that my monitor shuts off, just a black screen. The only thing I can do to fix the problem is do a hard reset, and I am getting increasingly worried about file system corruption. Please fix this problem that occurs with the lock screen on elementary OS 0.3 Freya (64-bit).
Thanks.

EDIT:

Perhaps "lock" isn't the exactly proper term here; this problem happens when I close the lid of my laptop, i.e., when my system goes to sleep and then locks.

[Durk (durkpotgieter)]

I have the same issue. I lock the screen, if I mediately move the mouse i get the lock screen and can type my password to login. If I leave for while and come back, just black screen with flickering line in top left corner. From today if I press super+l I mediately get black screen with flickering line and have to reboot. Alt+F1 flashes cli login and back to blck screen, then stuck again and have to reboot or hold alt+crtl+del for reboot.

[Durk (durkpotgieter)]

Just want to add. Closing the lid on my laptop works fine it recovers or comes back every time without issues. Tested all day today.
HP8460p i7

[mu1 (m-u1)]

Same problem here, although closing the laptop lid just results in the backlight regularly cycling with a black screen. No keyboard combination gets a response; hard drive light is flashing showing that the file transfer I started before locking the session is still active.