root@brutall-ideapad:~# tee /proc/acpi/bbswitch <<<OFF
OFF
root@brutall-ideapad:~# cat /proc/acpi/bbswitch
0000:01:00.0 ON
root@brutall-ideapad:~# dmesg | tail
[35496.478006] EXT4-fs (dm-4): mounted filesystem with ordered data mode. Opts: (null)
[41689.739646] bbswitch: version 0.4.1
[41689.739666] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
[41689.739685] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.VGA_
[41689.739982] bbswitch: detected an Optimus WMMX function
[41689.739997] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
[41743.010022] bbswitch: disabling discrete graphics
[41743.010588] bbswitch: Result of WMMX call for Optimus: 11000059
[41776.567635] bbswitch: disabling discrete graphics
[41776.568121] bbswitch: Result of WMMX call for Optimus: 11000059