I see there are lots of messages about fedora 12 freezing.
Actually I have such a problem with fedora 11 since I updated to kernel 2.6.30.
My laptop, all of a sudden, freezes. Everything is freezed: mouse is not working, keyboard not responding (hitting caps lock produces nothing), can't switch to terminals, ctrl+alt+canc don't work. I can just push the power button to shutdown the system. BUT the hard disk activity is still going on. I can see and hear the sleeping daemons that cause some usual disk activity while the rest of the system is completely freezed.
My system is a HP DV5-1025el with an AMD Turion ZM-80, Ati Radeon HD3450, 4Gb of RAM and 250gb HDD.
I got fedora 11 regularly updated, now has kernel 184.108.40.206-105.2.23.fc11, but it is used to happen also with older 2.6.30 kernels, NEVER happened with 2.6.29 kernels. Video driver isn't the cause, since it happens with both proprietary fglrx and OSS radeon drivers.