Am using openSUSE 12.1 (x86_64) with GNOME (not 12.2) and similar problems occured prior to my upgrade to 12.1.
Similar problem not frequent, however enough times need find solution other than turning the power OFF.
Each time appears at first glance to be a freeze/lockups, mouse still moves about, nothing else seems to respond, though clock keeps ticking.
For self, not yet identified IF exist common issues, apart from each time a user was logged in, then screen locked, then not done anything for over half an hour.
Noticed freeze is NOT total, as moving mouse over top of screen, looking at the top of screen application selectors, can see these open up - whilst easy to miss, as most remains hidden below desktop display image.
From another pc using Samba able to access my /home so could work with files, at least know the computer was not totally frozen
While using Samba copied .xsession-errors (a hidden file) into my problems folder so can look again later…
Samba disconnected from frozen computer
[Need learn how to connect from elsewhere using [b]NFS ]
Back to the frozen computer where found able to use Ctrl+Alt+F2 to open a full screen terminal !
Logged in then used top, however no ideas obvious to my NON-Technical mind…
Logged out, then logged back in as root, gave command shutdown -P now
Short recess, then returned and restarted,
This method hopefully improvement upon just disconnecting power…
Some differences, is this similar to the problem below ?