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#1 2024-12-17 15:38:57
- dziad
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- Registered: 2024-12-17
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[SOLVED] CPU limit issues on ThinkPad X270 running Arch Linux
When the laptop is plugged into power, everything works fine — there are no CPU limits or other issues. However, when I unplug the charger and try to run a game (even something like The Binding of Isaac), the CPU gets limited to 400 MHz. I tried modifying the GRUB configuration, which partially helped — the CPU limit is disabled when the processor is not under load (e.g., while browsing the web). However, when I launch a program that heavily loads the CPU, the 400 MHz limit comes back.
I also tried changing BIOS settings, including all options related to the CPU, but unfortunately, it didn’t help.
Last edited by dziad (2024-12-21 11:50:50)
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#2 2024-12-17 16:11:47
- gromit
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Re: [SOLVED] CPU limit issues on ThinkPad X270 running Arch Linux
Which CPU and kernel are you using? Also do you have any powersaving daemon installed?
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#3 2024-12-17 16:19:59
- dziad
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Re: [SOLVED] CPU limit issues on ThinkPad X270 running Arch Linux
Im using Intel Core i5-6300U, linux kernel, about the powersaving dameon im on a fresh install of arch so no i dont have it installed
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#4 2024-12-17 21:56:03
- V1del
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Re: [SOLVED] CPU limit issues on ThinkPad X270 running Arch Linux
Very often in firmware and not directly influenced in linux/by the OS, check your UEFI settings whether there's an option to disable a potential limit/try updating said UEFI.
FWIW an U processor is a low level and mainly power saving CPU it could very much be somewhat intentional...
Last edited by V1del (2024-12-17 21:56:45)
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#5 2024-12-20 08:26:04
- dziad
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Re: [SOLVED] CPU limit issues on ThinkPad X270 running Arch Linux
i updated the bios and disabled/enanbled hyper threading, changing mode on battery to optimized etc still nothing
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#6 2024-12-20 20:28:27
- gromit
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Re: [SOLVED] CPU limit issues on ThinkPad X270 running Arch Linux
Which kernel version do you have installed? Is it any different with the linux-lts kernel?
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#7 2024-12-21 11:49:26
- dziad
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Re: [SOLVED] CPU limit issues on ThinkPad X270 running Arch Linux
okay i found the solution, i needed to disable something called BD PROCHOT via MSR.
guide on how to do it: https://github.com/yyearth/turnoff-BD-PROCHOT
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