Comment 46 for bug 508699

While testing various kernels (mainly vanilla ones) I found:

booting Windows, then logging on installs the Windows Graphics driver. This driver installs and initializes a (irq-handler?). Rebooting the system leaves this installed handler intact. Linux (Ubuntu 10.04beta) uses this installed handler. Linux does not seem to reinstall or at least reinitialize the handler pointer again (I am not sure about this: maybe it does, but just overwrites it with the same value). All is OK then. X11 is running fine.

Switching the system off or suspending it (this removes the handler pointer, the handler itself seems to stay intact) removes the handler installed. As soon, as the system wants to call it it crashes ...