[SRU][N] Request

[Manuel Diewald]

On Thu, May 15, 2025 at 01:54:52PM +0200, Yahya Dakhil wrote:
> Hi Ubuntu kernel team,
> 
> Please, can you consider re-reverting an upstream commit e4731baaf294
> ("cpufreq:
> amd-pstate: Fix the inconsistency in max frequency units") [1]
> <https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/?id=342e57b2330b>
> to undo a
> previous revert [0]
> <https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/?id=d76c1093e3fc>
> on Jammy kernel branch hwe-6.8-next and Noble kernel.
> 
> In fact, after that revert [0]
> <https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/?id=d76c1093e3fc>
> of the upstream commit e4731baaf294 ("cpufreq:
> amd-pstate: Fix the inconsistency in max frequency units") [1]
> <https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/?id=342e57b2330b>,
> pushed in
> Ubuntu-6.8.0-48.48 / Ubuntu-hwe-6.8-6.8.0-48.48_22.04.1, incorrect value of
> cpuinfo_max_freq has been seen when disabling the cpufreq boost in passive
> mode
> (when amd_pstate=passive is passed to the kernel in the boot command line).
> This
> revert was originally introduced to address a regression observed in older
> stable kernels (precisely on 6.6.y, see [2]
> <https://lore.kernel.org/all/18882bfe-4ca5-495c-ace5-b9bcab796ae5@amd.com/>).
> However, this regression is linked
> to the absence of the linux upstream commit 5547c0ebfc2e ("cpufreq:
> amd-pstate:
> Unify computation of {max,min,nominal,lowest_nonlinear}_freq") that is not
> backported on 6.6.y but it is present in both 6.9.y [3]
> <https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=d10692ac4a4a2>
> and linux-hwe-6.8 [4]
> <https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/?id=7a7da95b1e7c>
> .
> 
> Thus, the revert should not have been applied to linux-hwe-6.8.
> 
> [0]
> https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/?id=d76c1093e3fc
> [1]
> https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/?id=342e57b2330b
> [2]
> https://lore.kernel.org/all/18882bfe-4ca5-495c-ace5-b9bcab796ae5@amd.com/
> [3]
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=d10692ac4a4a2
> [4]
> https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/noble/commit/?id=7a7da95b1e7c
> 
> Here is the launchpad entry:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2109609
> 
> 
> Regards,
> Yahya

> -- 
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team

Hi Yahya,

Thanks for investigating and pointing this out. I've submitted a patch
to fix this to the mailing list.

-- 
 Manuel
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