Comment 12 for bug 227882

Further testing with Intrepid gave me random locks, though it is much more stable than Hardy. Hardy will lock up unattended. Intrepid requires user activity before it will lock up, and even then it will run for an hour or so.
I tried swapping out my video card, ATI Radeon 8500, with an ATI Rage 128 (don't laugh, it's the only spare I've got) and got 80 minutes of uptime with Hardy and 2.5 hours in Intrepid with that combination of hardware.
Perhaps I'm seeing a problem a problem with the video driver, like described in Bug #141551. I still don't see any errors in the logs.
Any pointers as to how to narrow down the problem to the card, driver or kernel?