Cmnt: [SRU][N/P/R:linux-azure][PATCH 0/1] Include cppc_cpufreq in linux-modules

[Bryan Fraschetti]

Hi Tim,

This is not a high priority for Plucky, feel free to NACK it. Thanks!

Bryan

>
> On Wed, Dec 03, 2025 at 10:04:24AM -0500, Bryan Fraschetti wrote:
> > BugLink: https://bugs.launchpad.net/bugs/2119465
> >
> > [Impact]
> >
> > Azure requested cppc_cpufreq to be available by default (without need to
> install modules-extra). Address this by moving it to linux-modules.
> >
> > Include cppc_cpufreq module in linux-modules package instead of
> linux-modules-extra so that cpufreq is enabled by default (without the need
> to install linux-modules-extra).
> >
> > The fix is fairly simple, add the cppc_cpufreq.ko modules to
> azure-nvidia.inclusion-list in linux-azure-nvidia package, and to
> azure.inclusion-list for the linux-azure package. The objective is for the
> kernel module to be available in all 6.8 and newer linux-azure kernels
> >
> > Note that this has been fixed in linux-azure-nvidia as of
> linux-azure-nvidia - 6.8.0-1025.27. For linux-azure, the fix needs to be
> applied to Noble, Plucky, and Resolute. Questing can be skipped due to the
> commit at [1], which consolidates linux-modules and linux-modules-extra due
> to improvements to zst compression as outlined in LP: #2042831 [2]. These
> improvements allow for the compression of both sets to be smaller than the
> original compressed size of the linux-modules set, thereby, negating the
> benefits of the separation. If the patch at [1] is applied to Resolute
> before the one for this LP bug is applied, then this patch can be dropped
> for Resolute. Otherwise this patch should be applied to Resolute in the
> interim to avoid a regression.
> >
> > [1]
> https://git.launchpad.net/~canonical-kernel/ubuntu/+source/linux-azure/+git/questing/commit/debian.azure/control.d?h=master-next&id=1f36467420212d3073f7ee78bf7cb16b5c340146
> > [2] https://bugs.launchpad.net/bugs/2042831
> >
> > [Test Case]
> >
> > Currently cppc_cpufreq is not included in linux-modules package.
> >
> > root at flavio:/home/ubuntu# uname -rv
> > 6.8.0-1019-azure-nvidia #20-Ubuntu SMP Fri Jun 27 23:52:00 UTC 2025
> > root at flavio:/home/ubuntu# lsmod | grep cpufreq
> > root at flavio:/home/ubuntu#
> > root at flavio:/home/ubuntu# cat
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> > cat: /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor: No such file
> or directory
> >
> > Preparing a test kernel with the fix and installing only the linux-image
> and linux-modules package, cppc_cpufreq is present.
> >
> > ubuntu at flavio:~$ uname -rv
> > 6.8.0-1020-azure-nvidia #21 SMP Mon Aug 4 16:37:34 UTC 2025
> >
> > root at flavio:/home/ubuntu# lsmod | grep cpufreq
> > cppc_cpufreq 262144 0
> > root at flavio:/home/ubuntu# cat
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> > ondemand
> >
> > [Where problems could occur]
> >
> > The fix just adds a module in linux-modules package. Not any severe
> regressions expected. However, those who expected to find this module in
> modules-extra will not find there anymore.
> >
> > [Other]
> >
> > Originally the request was only for linux-azure-nvidia, for Noble, 6.8,
> which has since been fixed. The request is to now add the module to
> linux-azure for 6.8 and newer kernels. The existing linux-azure-nvidia bug
> report has been updated to reflect this and include linux-azure as a
> target, rather than creating a new bug.
> > SF#413581
> >
> > Bryan Fraschetti (1):
> >   UBUNTU: [Config] azure: add cppc_cpufreq to azure.inclusion-list
> >
> >  debian.azure/control.d/azure.inclusion-list | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > --
> > 2.43.0
> >
>
> Hi Bryan,
>
> from the BugLink I can't tell whether this is a high priority
> for Plucky. We've been asked to NACK submissions for Plucky that are not
> at least high priority. If it is, please let me know. I'll be happy
> to review it.
>
> Thanks,
> Tim
>
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