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f70d3e deseven 2025-06-12 13:30:10
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# C-States
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### Problem
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When running Linux, especially older 6.x kernels, you might find that the CPU doesn't use C-states below C1, constantly running on higher frequences and eating power.
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### Solution
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For some reason I couldn't make it work with either `acpi_cpufreq` or `amd_pstate`, but [CoreFreq](https://github.com/cyring/CoreFreq) turned out to be a perfect solution once again.
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Assuming that you already have it installed and working (otherwise check [[this guide|Guides/Hardware-Monitoring]] first):
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```bash
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# /etc/kernel/cmdline
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... initcall_blacklist=acpi_cpufreq_init nmi_watchdog=0 idle=halt amd_pstate=disable tsc=unstable nowatchdog
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```
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```bash
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# /etc/modprobe.d/blacklist.conf
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k10temp
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acpi_cpufreq
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```
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```bash
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# /etc/modprobe.d/corefreqk.conf
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options corefreqk Register_ClockSource=1 Register_CPU_Freq=1 Register_Governor=1 Register_CPU_Idle=1 Override_SubCstate="1,1,1,1,1,1,0,0"
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```
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Don't forget to do `update-initramfs -u -k all` after changing kernel's cmdline.