Comment 696 for bug 752542

The NVIDIA card sometimes fails to leave D0 (after 4-5 attempts switching between intel and intel+NVIDIA) on Ubuntu 14.04 (
linux 3.13.0-24-generic)

[ 243.241320] [drm] Module unloaded
[ 243.243046] bbswitch: disabling discrete graphics
[ 243.243061] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20131115/nsarguments-95)
[ 243.255861] pci_raw_set_power_state: 141 callbacks suppressed
[ 243.255868] pci 0000:01:00.0: Refused to change power state, currently in D0