Powertop --auto-tune: Refused to change power state

[postadelmaga]

Kernel: 4.12.10-1-ARCH Nvidia: 01:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 940MX] (rev ff) Driver: Nvidia 384.69

powertop --auto-tune makes Nvidia card not usable on battery

How to replicate:

1. Execute powertop --auto-tune OR echo 'auto' > '/sys/bus/pci/devices/0000:01:00.0/power/control';
2. unplug the power and run on battery
3. sudo tee /proc/acpi/bbswitch <<<ON and then cat /proc/acpi/bbswitch
4. Try to run any app with optirun ... fails

• This is what I see in dmesg: pci 0000:01:00.0: Refused to change power state, currently in D3
• Plug in the power again OR revert the PM setting (echo 'on' > '/sys/bus/pci/devices/0000:01:00.0/power/control';), don't solve the issue but I need to reboot the system:

Another user reported same issue here: https://github.com/Bumblebee-Project/bbswitch/issues/140#issuecomment-283809440

[Lekensteyn]

It is the same problem as #140. You must not enable runtime PM for the Nvidia device or alternatively boot with the pcie_port_pm=off option as described in #140.