I'm experiencing random freezes of two desktops, both up-to-date FC 18, totally different hardware (Core2Duo E5300, Core i7), different Graphis Cards but both Nvidia using nouveau with a dual monitor setup.
Desktop completely freezes, Num Lock on keyboard is dead. Gut feeling tells me it is induced by scrolling.
When happening, I can ssh into the machine, everything looks perfectly normal. No 100% CPU on nothing, no zombies, no whatever. Nothing in dmesg, Xorg.0.log, messages.
Restart of graphical.target does not do anything, when killing /usr/bin/X (with -9 though) I get kdm back.
Any thoughts where to debug further?