On the Dell Vostro 3550, for which info is already attached, the ACPI call \_SB.PCI0.PEG0.PEGP._OFF successfully disables the onboard radeon card, or at least claims to and reduces power use dramatically.
After this acpi call is made, there's about a 10 second delay during resume from sleep as the radeon driver hunts around for the card. It looks like the intel video bios doesn't like the card disappearing either, complaining:
On the Dell Vostro 3550, for which info is already attached, the ACPI call \_SB.PCI0. PEG0.PEGP. _OFF successfully disables the onboard radeon card, or at least claims to and reduces power use dramatically.
After this acpi call is made, there's about a 10 second delay during resume from sleep as the radeon driver hunts around for the card. It looks like the intel video bios doesn't like the card disappearing either, complaining:
[ 238.692874] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting execute_ table_locked] *ERROR* atombios stuck executing CCB4 (len 62, WS 0, PS 0) @ 0xCCD0 execute_ table_locked] *ERROR* atombios stuck executing B9C8 (len 1036, WS 4, PS 0) @ 0xBAC5 execute_ table_locked] *ERROR* atombios stuck executing B95E (len 76, WS 0, PS 8) @ 0xB966
[ 238.692878] [drm:atom_
[ 238.692881] [drm:atom_
[ 238.692884] [drm:atom_
then repeatedly
[ 244.058077] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting execute_ table_locked] *ERROR* atombios stuck executing CCB4 (len 62, WS 0, PS 0) @ 0xCCD0
[ 244.058080] [drm:atom_
.... so be careful when turning off secondary video hardware.