(If this is in the wrong place, please let me know)
Ever since I went to the 2.6.39-2-686-pae kernel (HP HDX16; Centrino 2/4gig RAM/250meg HDU, running Mint XFCE 201104), once in a while, I've gotten some odd lockups.
It happened once switching between XFCE workspaces, and once when the machine had sat unused running a download for at least 45 minutes (given that the download had sucessfully completed). The symptoms were that it stopped responding to the keyboard or touchpad, and one oddity: the caps lock light kept flashing. I had to hard power off, which left the filesystem unclean, but I was able to fsck it both times (the 2nd times with an external USB key, just to be safe).
I've checked several of the logs (messages, dmesg, Xorg,) and nothing jumps out at me, so I don't know if its an X problem or something related to the kernel. I did have to manually install the Nvidia drivers for my card, and though it worked fine under 2.6.32-2.686, I don't know if I need to go to newer drivers, but Nvidia's site doesn't have any newer once listed for my card.
I'm a bit new to this sort of thing, so any guidance would be appreciated.