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Re: Cpufreq drivers not working on T480S
- To: Milky <milky_way_303030@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 12 Jan 2026 09:43:02 +0100
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jason Andryuk <jandryuk@xxxxxxxxx>
- Delivery-date: Mon, 12 Jan 2026 08:43:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.01.2026 09:44, Milky wrote:
> On Thursday, January 8th, 2026 at 7:46 AM, Jan Beulich <jbeulich@xxxxxxxx>
> wrote:
>
>>> The same is also true under Debian Live; does it mean that frequency
>>> scaling, since it seems to be working under Debian Live, doesn't always
>>> rely on this?
>>
>>
>> Yes, that's possible afaik. Which driver is in use there?
>
> `/sys/devices/system/cpu/cpu0/scaling_driver` shows `intel_pstate`; confirmed
> also using `dmesg`, which shows Intel P-state initialisation and HWP being
> enabled.
>
>>> Maybe also with Xen's command line try cpufreq=xen:no-hwp to disable
>>> HWP and see if the regular ACPI cpufreq driver works better
>
> Following from Marek's message elsewhwere in the thread, I now tried adding
> in grub the correct Xen flag to disable HWP on Qubes: `cpufreq=xen,no-hwp`. I
> am pasting below the output of `xl dmesg`. It seems it no longer reports HWP
> being enabled. However, `xenpm get-cpufreq-para` still says "failed to get
> cpufreq parameter", `xenpm get-cpufreq-states` returns nothing.
And was is meanwhile checked that ACPI provides the necessary tables, and
xen-processor-acpi manages to processes and upload them?
Jan
|
