Comment 4 for bug 563481

I'm also experiencing this issue: about once a month the entire X session will lock; even the cursor stops moving. I previously assumed that this was the hardware locking up, but I've just discovered I can SSH into the box while it's locked up. Running 'reboot' does very little, and I get a black square with some randomly-placed coloured pixels up the top-left of my desktop.

Until recently I was running Jaunty, and I was experiencing the issue there as well. I dist-upgraded to Lucid via Karmic a few weeks ago. I haven't been able to link the crashes to any specific activity. I'm reasonably sure my memory is ok; I plan to run memtest86 soon to confirm.

I'll run apport-collect as requested as soon as I can work out how to login to launchpad (#556927, awesome...).