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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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Undervolt stable on Windows but crashes on Linux (lemmy.world)

submitted 1 year ago by Infernal_pizza@lemmy.world to c/linux@lemmy.ml

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I undervolted my CPU about a year ago and haven't had any issues with it till now. I've been dual booting Linux recently and noticed whenever I was in Linux it would crash/reboot after a couple of hours or less of using it. I noticed the behavior was similar to when I set the voltages too low when initially setting up the undervolt so I disabled it and haven't had any crashed since. Any idea why it would be stable on Windows but not Linux? I tried a couple of different distros as well. I'll probably just raise the voltage until I get it stable again but I'm interested to know what could cause this! If its relevant my CPU is a Ryzen 7 3800x

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[–] Infernal_pizza@lemmy.world 4 points 1 year ago (1 children)

I'm on 6.4.12 so not the very latest but close. You did make me think to check the CPU frequency scaling though and I've spotted a couple of things it could be. I seem to be using the acpi-cpufreq driver rather than amd_pstate, not sure if its worth switching over? It also seems to be set to keep the frequency between 2.2-3.9GHz whereas on Windows my CPU almost always boosts to around 4.2-4.3. I might change that if I notice any performance issues but tbh I might leave it for now and see how things go. It might run a bit cooler if its not always boosting and I can probably still undervolt just not by as much

[–] SteveTech@programming.dev 4 points 1 year ago (1 children)

It might run a bit cooler if its not always boosting

I've heard that amd_pstate is a lot more power efficient (thus cooler) compared to acpi.

Like I believe amd_pstate has a lot more states than acpi-cpufreq so it gives Linux much more granular control over the CPU's performance.

[–] Dremor@lemmy.world 4 points 1 year ago (1 children)

I can validate that. Switched my NAS to amd_pstate, went from 2.12 kW.h per day to 1.95 kW.h per day.

[–] Infernal_pizza@lemmy.world 1 points 1 year ago

hmm I might give it a try then, last time I mentioned it I was recommended to just stick with the defaults