Kernel 6.11 ignores fixed CPU frequency

ptr1337 · September 26, 2024, 3:04pm

Well, as I said - I can help you with and compile you the kernels, but you need to test it.

Otherwise, just other people will face it as soon 6.12 is released. You can help there a lot.

axra · September 26, 2024, 3:08pm

Ok, I would like to help and test. How to start?

tomj44 · September 28, 2024, 12:13pm

hi same max is 3301Mhz for my 8840HS using cachyos 6.11-05 ,
no problem with 6.11.arch-1-1
I can also test .
Thomas

naim · September 30, 2024, 2:46pm

A little bit of update on this. @ptr1337 has also noticed a similar problem with the active driver: Core Performance Boost limited frequency is not respected with the 6.12 patches. He will bisect soon and follow up here. Sorry for the inconvenience.

naim · September 30, 2024, 3:11pm

Update: Our curent stance is to drop the 6.12 amd-pstate patches until there are fixes. See 6.11: Drop amd-pstate, add fixes for intel and btrfs, update BORE Sch… · CachyOS/kernel-patches@1db509e · GitHub

Stay tuned for 6.11.1

tomj44 · October 1, 2024, 6:09am

fixed with 6.11-2 thanks

axra · October 1, 2024, 6:26am

Yes, no issues with Linux 6.11.1-2-cachyos.

naim · October 1, 2024, 7:41am

Thanks. I’ll consider this solved for now. I will update again on this thread when we readd the 6.12 patchset with the necessary fixes.

axra · October 2, 2024, 5:32am

Same issue in 6.12.rc1-1.

naim · October 2, 2024, 7:29am

Obviously, as the patches were pulled in from 6.12 tree. There hasn’t been any fixes as far as I’m aware. No bisects have been made either.

ptr1337 · October 3, 2024, 4:22pm

Bisected it down and reported to AMD:
https://bugzilla.kernel.org/show_bug.cgi?id=219348

tomj44 · October 11, 2024, 6:08am

hi
bug back with 6.11.3-3-cachyos

naim · October 11, 2024, 6:24am

What about 6.11.3-2?

edit: @tomj44 what CPU do you have?

tomj44 · October 11, 2024, 6:47am

I haven’t test 6.11.3-2 , my cpu is 8840HS , Asus zenbook 14 UM3406HA
now i m back with arch kernel 6.11.3-1 , cpu freq ok but also less power consumption (laptop) than cachyos 6.11.1-2 (cachyos kernel 24h ago).
without do anything cachyos kernel 4 W , arch kernel 3W
YT same video cachyos 8W , arch 6W

axra · October 11, 2024, 6:58am

I cannot confirm. Working here on Ryzen 9 7940HS.
Tested with amd_pstate set to active and passive.
Linux 6.11.3-3-cachyos znver4

naim · October 11, 2024, 7:07am

@tomj44 Can you make a detailed steps-to-reproduce

e.g.

Steps to Reproduce:
1. Do this
2. Do that

Expected behaviour:
That should happen

Actual behaviour:
This happens instead

tomj44 · October 11, 2024, 7:25am

after reboot to cachyos kernel i can’t reproduce trouble , i m now able rich 5132Mhz , i was stuck at 3301 this morning
sorry no idea why but seems ok now , also power consumption is now same as arch kernel, yesterday is was not good maybe uefi bug
edit thanks u for fast reply

axra · October 15, 2024, 7:16am

Still the same issue in 6.12.0-rc3-1-cachyos-rc.

ptr1337 · October 16, 2024, 4:27pm

Cant reproduce anymore. Disabling boost is properly working.

axra · October 16, 2024, 5:10pm

You can see it in the pictures.
If I limit my max CPU Freq to 2500MHz some cores ignore this setting and go beyond. No matter which governor I choose and no matter if I set amd_pstate to active or passive. I don’t think this is boost related.
No such issue in latest Kernel 6.11.