I was experiencing this issue on an HP Touchsmart TM2 (model tm2t-1000), with only an Intel video card, with kernels 2.6.35+ and 3.0.0-10 and was able to work around it using the kernel boot parameter "acpi=off". After updating the BIOS to the latest one provided by HP I no longer encountered this issue and did not need the kernel boot parameter.
I was experiencing this issue on an HP Touchsmart TM2 (model tm2t-1000), with only an Intel video card, with kernels 2.6.35+ and 3.0.0-10 and was able to work around it using the kernel boot parameter "acpi=off". After updating the BIOS to the latest one provided by HP I no longer encountered this issue and did not need the kernel boot parameter.