// uname -r
[vexisu@PowerBook ~]$ uname -r
4.9.20-1-MANJARO

// pacman -Qs bbswitch
[vexisu@PowerBook ~]$ pacman -Qs bbswitch
local/linux49-bbswitch 0.8-18 (linux49-extramodules)
    kernel module allowing to switch dedicated graphics card on Optimus laptops


// dmesg | grep bbswitch
[vexisu@PowerBook ~]$ dmesg | grep bbswitch
[ 3904.025894] bbswitch: loading out-of-tree module taints kernel.
[ 3904.026431] bbswitch: version 0.8
[ 3904.026440] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
[ 3904.026448] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
[ 3904.026477] bbswitch: failed to evaluate \_SB_.PCI0.PEG0.PEGP._DSM {0xF8,0xD8,0x86,0xA4,0xDA,0x0B,0x1B,0x47,0xA7,0x2B,0x60,0x42,0xA6,0xB5,0xBE,0xE0} 0x100 0x0 {0x00,0x00,0x00,0x00}: AE_NOT_FOUND
[ 3904.026495] bbswitch: failed to evaluate \_SB_.PCI0.PEG0.PEGP._DSM {0xA0,0xA0,0x95,0x9D,0x60,0x00,0x48,0x4D,0xB3,0x4D,0x7E,0x5F,0xEA,0x12,0x9F,0xD4} 0x102 0x0 {0x00,0x00,0x00,0x00}: AE_NOT_FOUND
[ 3904.026576] bbswitch: No suitable _DSM call found.