Fedora 34 - Unable to write to MSR

[lakotamm]

Fedora 34 brings new issues with MSR and I do not seem to be able to find a solution. At the moment none of the solutions mentioned in the main repo's issue tracker work.

Kernel - 5.11.10-300.fc34.x86_64
throttled version - 0.8-3, installed from copr
Secure boot setting in BIOS - Disabled
lsm parameters:

lockdown,capability,yama,selinux

Systemctl status reported error:

Mar 29 13:35:34 fedora throttled[1161]: [E] Unable to write to MSR. Try to disable Secure Boot and check if your kernel does not restrict access to MSR.
Mar 29 13:35:34 fedora systemd[1]: throttled.service: Main process exited, code=exited, status=1/FAILURE
Mar 29 13:35:34 fedora systemd[1]: throttled.service: Failed with result 'exit-code'.

Attempted kernel parameters:

BOOT_IMAGE=(hd0,gpt4)/vmlinuz-5.11.10-300.fc34.x86_64 root=UUID=906d272f-a74d-4844-8ba3-03ea526bb9be ro rootflags=subvol=root rhgb quiet acpi_osi=!Linux-Lenovo-NV-HDMI-Audio lsm=capability,yama,selinux

BOOT_IMAGE=(hd0,gpt4)/vmlinuz-5.11.10-300.fc34.x86_64 root=UUID=906d272f-a74d-4844-8ba3-03ea526bb9be ro rootflags=subvol=root rhgb quiet acpi_osi=!Linux-Lenovo-NV-HDMI-Audio msr.allow_writes=on

I am using Lenovo T490 with both Manjaro Stable 21.0 and Fedora 34 Beta. On Manjaro with kernel 5.11, the kernel parameter msr.allow_writes=on works well. I have no clue why this is not the case with Fedora 34.

[timrichardson]

I thought Lenovo fixed this on the T490 with a BIOS update. I'm on the T480 and there is no BIOS fix. I think Fedora has made a kernel config change to stop MSR writes with F34, since it still works in F33 in 5.11

[lakotamm]

I am still using old BIOS 1.53 from August 2019 on my T490, because all newer BIOSes limit the dGPU temperature to 56 degrees C, which is very annoying. But I am not sure I understand the connection with BIOS.

[timrichardson]

The BIOS connection is that the throttling of the T480 and T490 (and later models) is due to Intel firmware designed only for Windows. Lenovo had great difficulty fixing it for the T480 and 490, and decided only to fix the 490. At least, this is what they said. The fix is some kind of reverse engineered firmware update which arrives via a 'BIOS' update.

…

On Mon, 12 Apr 2021, 04:15 lakotamm, ***@***.***> wrote: I am still using old BIOS 1.53 from August 2019 on my T490, because all newer BIOSes limit the dGPU temperature to 56 degrees C, which is very annoying. But I am not sure I understand the connection with BIOS. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#17 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAHCNYVFCP2D5LIMUY34BQ3TIHRMBANCNFSM42ADQCKA> .

[elwerene]

It needs a selinux policy: erpalma/throttled#250 (comment)

[abn]

Guess we can make that a subpackage. Happy to accept a PR for this.