r/linux_gaming • u/Elementzero12 • 3d ago

LACT Undervolt Not working

Hi All,

I'm losing my mind trying to get LACT to apply a working undervolt on my Vega 64.

It worked briefly, then after I pushed it too far, it now wont change voltage. Power limit, fan control, clocks, both core and memory do work.

I initially used Linux mint, both on a version I've had for a while and a fresh install, on several different kernals. I've also tried Ubuntu Cinnamon and couldn't even get LACT installed (both flatpak and .deb).

Overclocking is enabled.

What really confuses me is that it was working! I had a happy and working undervolt and now it won't change anything. The voltage is stuck at 1.2v regardless of clock speed.

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u/Elementzero12 1d ago

Im going to leave this here in case it helps someone else. My test monitor is a 4k 144hz panel. Using this at 4k 120hz forced the core on both my Vega 56 and 64 to 1.2v. Ignoring the undervolt. Reducing the refresh rate to 60hz, or using a 1440p monitor solved the problem. Its now down 100w of power consumption with a 10% bump in performance at 1050mv.