lspci -k 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) Subsystem: Dell Device 054f Kernel driver in use: i915 01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT 640M] (rev ff)
cat /proc/acpi/bbswitch 0000:01:00.0 OFF
lspci -k
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
Subsystem: Dell Device 054f
Kernel driver in use: i915
01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT 640M] (rev ff)
cat /proc/acpi/bbswitch
0000:01:00.0 OFF