Comment 16 for bug 1751268

[ 3.562059] bbswitch: loading out-of-tree module taints kernel.
[ 3.562266] bbswitch: version 0.8
[ 3.562272] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.VID_
[ 3.562278] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG_.VID_
[ 3.562286] ACPI Warning: \_SB.PCI0.PEG.VID._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20180105/nsarguments-100)
[ 3.562634] bbswitch: detected an Optimus _DSM function
[ 3.562644] pci 0000:01:00.0: enabling device (0000 -> 0003)
[ 3.562676] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on

Can you disable the discrete card and run without out-of-tree stuff?