[9] INFO: # Xorg pre-start hook
[9] INFO: Requested mode is: intel
[9] INFO: Checking for GDM display servers
[162] INFO: Available modules: ['nouveau']
[162] INFO: Loading module bbswitch
[162] ERROR: Cannot load bbswitch. Continuing anyways. Error is: module bbswitch is not available for current kernel. Is the corresponding package installed ?
[162] INFO: Setting GPU power to OFF via bbswitch
[162] ERROR: Xorg pre-start setup error
Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/optimus_manager/kernel.py", line 224, in _set_bbswitch_state
    with open("/proc/acpi/bbswitch", "w") as f:
FileNotFoundError: [Errno 2] No such file or directory: '/proc/acpi/bbswitch'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/optimus_manager/hooks/pre_xorg_start.py", line 33, in main
    setup_kernel_state(config, prev_state, requested_mode)
  File "/usr/lib/python3.8/site-packages/optimus_manager/kernel.py", line 24, in setup_kernel_state
    _nvidia_down(config)
  File "/usr/lib/python3.8/site-packages/optimus_manager/kernel.py", line 72, in _nvidia_down
    _set_bbswitch_state("OFF")
  File "/usr/lib/python3.8/site-packages/optimus_manager/kernel.py", line 227, in _set_bbswitch_state
    raise KernelSetupError("Cannot open /proc/acpi/bbswitch")
optimus_manager.kernel.KernelSetupError: Cannot open /proc/acpi/bbswitch
[163] INFO: Removing /etc/X11/xorg.conf.d/10-optimus-manager.conf (if present)
[163] INFO: Writing state {'type': 'pre_xorg_start_failed', 'switch_id': '20200515T175609', 'requested_mode': 'intel'}