https://bugs.kde.org/show_bug.cgi?id=527160

--- Comment #2 from Jimmothy <[email protected]> ---
Did some further testing. Confirmed the helper is the sole cause of the power
draw. Disabling it immediately drops idle power draw from 11w to 4 watts (pre
6.8 idle draw). 

I also made a revised helper (with the help of Codex), to test this further.
The new helper restores function without the idle draw. 

The new helper: 
- reads GT idle residency from sysfs (gtidle/idle_residency_ms), which doesn't
wake the GT
- reports 0% usage without opening any events if the GT was >=95% idle
- otherwise opens the engine events for a 50 ms sample, then closes them
  (only every 5 s if the GT is 80-95% idle)
- reads frequency from sysfs freq0/act_freq instead of the PMU

Test patch attached.

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