Ubuntu

I9-12900 stuck at 400mhz

Asked by Charles Evans

Booting ubuntu studio livecd
Kernel 5.15.0-54-lowlatency
Bios_limit shows 400000 for all CPUs
Cores 13-20 will boost to 2ghz under load
Cores 1-12 stay at 400mhz
How do I fix this?
Power management / energy saving
shows no profiles to switch to

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Charles Evans
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Revision history for this message
Charles Evans (crtiger) said : 		#1

Correction: only cores 17-20 will exceed 400mhz

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actionparsnip (andrew-woodhead666) said : 		#2

Does the system have a make and model?

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actionparsnip (andrew-woodhead666) said : 		#3

https://superuser.com/questions/1420298/processor-speed-limited-at-0-4-ghz

Could be insufficient power. The CPU can ramp up to 202 Watts of power use. If you have a small PSU then this can limit your chip

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Charles Evans (crtiger) said : 		#4

Power brick is 240W
Power draw under load has never exceeded 75W, due to low clock rate.

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Charles Evans (crtiger) said : 		#5

Katana GF66 12UGSK-831

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Charles Evans (crtiger) said : 		#6

Ubuntu studio does not come with
Cpupower
I will add it, via
Linux-tools-lowlatency
How should I request that it be added to the livecd?

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Charles Evans (crtiger) said : 		#7

System monitor shows
Lithium ion battery charging rate as -51w
When charger is pushing over 130w,
Should be +75W.

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Charles Evans (crtiger) said : 		#8

Systemd-udevd is pegged at 100% cpu
For 4 days (since boot)

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Charles Evans (crtiger) said : 		#9

Dmesg:thermal thermal_zone7: failed to read out thermal zone (-61)

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Charles Evans (crtiger) said : 		#10

Changed bios mode to performance,
Turned on speed shift in bios
Now all cores are boosting.
BTW page linked has good general info
Thanks all