Feature Request: ASPM support

[emansom]

Is your feature request related to a problem? Please describe.

Currently when running GameMode on e.g. a laptop, where Active State Power Management might be in the lowest ASPM power state (superpowersave) to preserve power: there's no way to toggle ASPM to performance automatically on game start.

This currently leads to stuttering when the full link bandwidth can't be utilized and higher GPU clocks can't be reached.

Describe the solution you'd like

GameMode to introduce a new (disabled by default) setting to manage ASPM, similar to the AMDGPU performance level setting.