I'm in the process of upgrading my LMDE system, and the last step was upgrading to Gnome 3. It went OK, with some solvable issues. But one was quite annoying: if I left the system idle long enough for the screen saver to activate, the system would not resume, no matter what I typed or how I moved my mouse.
I suspected gnome-screensaver and purged it. Nothing changed. But, after reading a bit on how suspend/lock/screensave works here:
https://wiki.edubuntu.org/DebuggingScre ... ckingWorks
I targeted gnome-power-manager as to blame. I purged it, and voilá: the issue is gone.
I'm in a desktop, so I don't need gnome-power-manager. But this will be a real issue for laptop users.
BTW, I saw there's a relationship between this gpm bug and an nVidia driver:
But I don't have nVidia hardware - my video chipset is Intel. So there's more to it.
Wel, so far, that's what I got: for those who don't need gpm, just purge it.