Help debug a coil whine issue, might be related to advanced HWP settings

[sunrez]

Hi there,

First thanks for this contribution! It makes tuning and playing with HWP easier, highly appreciated.

I wanted to ask, beyond the core HWP capability, is there any GPU or memory power management settings to tweak?

I am trying to debug a coil whine problem on a Dell XPS13 on Mojave and have traced it down to something in the power management / voltage scaling. If the laptop sleeps, and then wakes up, I notice a difference in power settings and whine disappears. I tried using CPUTune AFTER the coil whine goes away and changing "HWPRequest.conf" and played around and could NOT get the coil whine to come back. Conversely, I've played with HWP when coil whine is present and could NOT make it go away.

I've documented my experiences here (prior to using CPUTune, using HWPEnable utilities) here:

https://pastebin.com/Rkwu2DL2

theQuert/XPS-9360-macOS#25

Any suggestions would be appreciated!

[syscl]

You've raised a good point. I need to check if I can tune the GPU frequency at some point.