.....

[    0.675248] pci 0000:00:02.0: vgaarb: setting as boot VGA device
[    0.675248] pci 0000:00:02.0: vgaarb: VGA device added: decodes=io+mem,owns=io+mem,locks=none
[    0.675248] pci 0000:01:00.0: vgaarb: VGA device added: decodes=io+mem,owns=none,locks=none
[    0.675248] pci 0000:00:02.0: vgaarb: no bridge control possible
[    0.675248] pci 0000:01:00.0: vgaarb: bridge control possible
[    0.675248] vgaarb: loaded

    .......

[    0.705041] pci 0000:00:02.0: Video device with shadowed ROM at [mem 0x000c0000-0x000dffff]
[    0.705593] pci 0000:01:00.1: D0 power state depends on 0000:01:00.0

    ........

[   16.238025] nvidia: module license 'NVIDIA' taints kernel.
[   16.238028] Disabling lock debugging due to kernel taint
[   16.299866] nvidia-nvlink: Nvlink Core is being initialized, major device number 239
[   16.300180] nvidia 0000:01:00.0: enabling device (0000 -> 0003)
[   16.300279] nvidia 0000:01:00.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=none:owns=none
[   16.300723] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  390.132  Fri Nov  1 00:40:14 PDT 2019 (using threaded interrupts)
[   16.365422] nvidia-modeset: Loading NVIDIA Kernel Mode Setting Driver for UNIX platforms  390.132  Fri Nov  1 04:06:17 PDT 2019
[   16.374918] [drm] [nvidia-drm] [GPU ID 0x00000100] Loading driver
[   16.374922] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:01:00.0 on minor 1

    ........

[   23.527636] bbswitch: version 0.8
[   23.527650] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
[   23.527662] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
[   23.527683] ACPI Warning: \_SB.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20190816/nsarguments-66)
[   23.528007] bbswitch: detected an Optimus _DSM function
[   23.528023] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
[   23.535762] [drm] [nvidia-drm] [GPU ID 0x00000100] Unloading driver
[   23.558863] nvidia-modeset: Unloading
[   23.578941] nvidia-nvlink: Unregistered the Nvlink Core, major device number 239
[   23.655282] bbswitch: disabling discrete graphics
[   23.671963] pci 0000:01:00.0: Refused to change power state, currently in D0

    ........