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Re: Cpufreq drivers not working on T480S
- To: Milky <milky_way_303030@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 8 Jan 2026 08:46:34 +0100
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jason Andryuk <jandryuk@xxxxxxxxx>
- Delivery-date: Thu, 08 Jan 2026 07:46:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 07.01.2026 21:02, Milky wrote:
> On Tuesday, January 6th, 2026 at 1:06 AM, Jason Andryuk <jandryuk@xxxxxxxxx>
> wrote:
>> You could de-compile the ACPI tables and see if they have CPU info.
>> Something like:
>> mkdir acpi-tables
>> cd acpi-tables
>> cp /sys/firmware/acpi/tables/* .
>> iasl -d *
>> grep -r -e _PCT -e _PPC -e _PSS *.dsl
>>
>> That could help confirm the tables are missing.
>
> Unfortunately it would appear so. Grepping doesn't return any results.
>
> 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?
Jan
> I'm currently trying to find someone else with a librebooted T480S to check
> their ACPI tables, since I'm wondering if I botched my libreboot build.
>
>
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