dmesg

[   22.514398] bbswitch: version 0.4.2
[   22.514408] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
[   22.514418] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
[   22.514666] bbswitch: detected an Optimus _DSM function
[   22.514675] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
[   25.667477] bbswitch: disabling discrete graphics
[   25.667651] bbswitch: Result of Optimus _DSM call: 11000059
[   25.679502] pci 0000:01:00.0: Refused to change power state, currently in D0
[   25.709638] pci 0000:01:00.0: power state changed by ACPI to D3hot
[   96.598675] bbswitch: enabling discrete graphics
[   97.049644] pci 0000:01:00.0: power state changed by ACPI to D0
[   97.060252] pci 0000:01:00.0: Refused to change power state, currently in D3
[   97.120546] pci 0000:01:00.0: power state changed by ACPI to D0
[   97.133664] pci 0000:01:00.0: Refused to change power state, currently in D3
[  112.355071] bbswitch: enabling discrete graphics
[  112.355083] pci 0000:01:00.0: power state changed by ACPI to D0
[  112.365430] pci 0000:01:00.0: Refused to change power state, currently in D3
[  112.365441] pci 0000:01:00.0: power state changed by ACPI to D0
[  112.378761] pci 0000:01:00.0: Refused to change power state, currently in D3