Add power-saver (SAV) option to RADEON_DPM_PERF*, RADEON_DPM_STATE* settings

[SkajpCZ]

This is the code that i used as PoC for the power-saver setting for RADEON_DPM_PERF* and RADEON_DPM_STATE*.

It works the way I expected. When I have my laptop plugged in with power-saver - its set to power-saver. When i put balanced or performance it respects the _AC setting, also the same applies from battery.

[linrunner]

Your commit looks good to me. However, you need to add the new parameters to tlp.conf:
https://github.com/linrunner/TLP/blob/main/tlp.conf.in#L381

I'm still wondering which parameter values you are actually using for all the profiles. Maybe you could just show

tlp-stat -c | grep RADEON

[SkajpCZ]

This is my configuration

> tlp-stat -c | grep RADEON
defaults.conf L0034: RADEON_DPM_PERF_LEVEL_ON_AC="auto"
/etc/tlp.conf L0387: RADEON_DPM_PERF_LEVEL_ON_BAT="auto"
/etc/tlp.conf L0388: RADEON_DPM_PERF_LEVEL_ON_SAV="low"
/etc/tlp.conf L0394: RADEON_DPM_STATE_ON_AC="performance"
/etc/tlp.conf L0395: RADEON_DPM_STATE_ON_BAT="battery"
/etc/tlp.conf L0396: RADEON_DPM_STATE_ON_SAV="battery"