A BIOS update has been released for the AMD muxless HP dv6/dv7 61xx series.
This for laptops with a 6470M(?) or 6770M.
The update enables Fixed Mode in the BIOS for discrete-only operation
with the Sandy Bridge IGP acting as a mux.
ftp://ftp.hp.com/pub/softpaq/sp54001-54500/sp54024.exe