Linux CPU Frequency Scaling on the Intel i9 7980XE
I spent some time this morning trying to work out why my CPU - the beastly Intel i9 7980XE - was capped at 2.6ghz when the BIOS allows scaling to 4.3ghz.
When I ran the usually suggested cpufreq and cpupower commands, I received: "no or unknown cpufreq driver is active on this CPU".
The reason for this was that you need, in the UEFI/BIOS, to enable: Intel Enhanced SpeedStep and the option to expose pstates. Once these are enabled, the CPU scales within linux and cpufreq commands work.
Linux CPU Frequency Scaling on the Intel i9 7980XE was originally published by Martin Paul Eve at eve.gd: Martin Paul Eve on July 23, 2018.
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10.59348_sxzd8-ymd56.pdf
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Additional details
Description
I spent some time this morning trying to work out why my CPU - the beastly Intel i9 7980XE - was capped at 2.6ghz when the BIOS allows scaling to 4.3ghz. When I ran the usually suggested cpufreq and cpupower commands, I received: "no or unknown cpufreq driver is active on this CPU". The reason for this was that you need, in the UEFI/BIOS, to enable: Intel Enhanced SpeedStep and the option to expose pstates.
Identifiers
- GUID
- https://doi.org/10.59348/sxzd8-ymd56
- URL
- https://eve.gd/2018/07/23/linux-cpu-frequency-scaling-on-the-intel-i9-7980xe/
Dates
- Issued
-
2018-07-22T00:00:00Z
- Updated
-
2018-07-22T23:00:00Z