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Re: Cpufreq drivers not working on T480S
- To: Milky <milky_way_303030@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 15 Jan 2026 08:51:30 +0100
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jason Andryuk <jandryuk@xxxxxxxxx>
- Delivery-date: Thu, 15 Jan 2026 07:51:44 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.01.2026 00:42, Milky wrote:
> On Wednesday, January 14th, 2026 at 11:12 AM, Jan Beulich <jbeulich@xxxxxxxx>
> wrote:
>> On 14.01.2026 11:58, Milky wrote:
>>
>>> Just wanted to update this thread to say that now another T480 user (the
>>> T480 is a very similar model to my T480S) using the release builds of
>>> libreboot (as of 26.01 RC1) also has the entries missing from the ACPI
>>> tables. That discussion was here
>>> https://codeberg.org/libreboot/lbmk/issues/394. So this confirms that I'm
>>> running a standard libreboot, rather than a bad build.
>>>
>>> Do you think there is any way to avoid the underclocking issue with Xen on
>>> such devices/firmware?
>>
>>
>> In principle there is, but in the absence of ACPI data that means holding
>> model-
>> specific data in Xen. Which iirc is what the intel-pstate driver in Linux
>> does
>> (using ACPI info nowadays only as "auxiliary" data). But I may be wrong
>> there,
>> as it has been a long time since I last looked at that driver.
>
> In that case, would you say this is settled now? Would it make sense to
> report back to the QubesOS community that librebooted T480/S will run
> underclocked, due to the missing data in ACPI tables and lack of native
> support in Xen? This information is important, as the device is only barely
> usable.
What to suggest to the Qubes community needs to be discussed there, I think.
Jan
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