Re: HP Omnibook Ultra Flip 14 - power profiles

[Armin Wolf <W_Armin@gmx.de>]

Am 30.06.25 um 14:32 schrieb Benjamin Hasselgren-Hallén:

>
>
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> Best regards,
> Benjamin Hasselgren-Hallén
>
>
> On Saturday, 28 June 2025 at 02:45, Kurt Borja <kuurtb@gmail.com> wrote:
>
>> On Fri Jun 27, 2025 at 5:49 PM -03, Benjamin Hasselgren-Hallén wrote:
>>
>>> Hi Kurt,
>>>
>>> I do not experience the same error messages as in the bug report - no error message at all. It respons to changing power profile without any errors.
>>> I also tried 6.12 but same behaviour as 6.15.3 (just getting some gpu glitches - problably because of Lunar Lake).
>>
>> Can you paste the output of `cat /sys/firmware/acpi/platform_profile` on
>> Linux v6.12?
> cat /sys/firmware/acpi/platform_profile_choices
> cool quiet balanced performance
>
> cat /sys/firmware/acpi/platform_profile
> cat: /sys/firmware/acpi/platform_profile: Invalid argument

Good, it seems that the firmware returns additional data when querying the current platform profile.
As the driver does not mask-out this data, he cannot determine what kind of platform profile is currently
selected and thus returns -EINVAL.+

I can provide you with an experimental patch, could you test that?

Thanks,
Armin Wolf

>>> I am trying to understand how power profiles work - I guess on a high level it's controlled by uefi and the profile is set by the OS? Or is it more complicated than that?
>>
>> Yes, as quick overview. Power profiles are usually a capability of
>> individual devices. Drivers of these devices expose this profiles to
>> userspace through some predefined interfaces. Then your DE enviroment
>> exposes this to you.
>>
>> KDE and Gnome use power-profiles-daemon. This program controlls mainly
>> two kernel interfaces: CPUFreq and platform-profile (there may be more).
>>
>> You can read about CPUFreq here [1], although I don't know much about
>> it. The platform-profile interface may be used by any platform driver -
>> in your case this is the hp-wmi driver.
>>
>> This driver exposes some firmware defined profiles to sysfs trough the
>> following paths.
>>
>> /sys/firmware/acpi/
>> /sys/class/platform-profile/
>>
>> You won't find the latter in the Linux LTS version though. You will find
>> documentation on these paths here [2] and [3] respectively.
>>
>> PD: Please, avoid top-posting in kernel mailing lists, interleaved style
>> is very much preferred [4].
>>
>>
>> [1] https://docs.kernel.org/admin-guide/pm/cpufreq.html
>> [2] https://docs.kernel.org/admin-guide/abi-testing-files.html#abi-file-testing-sysfs-platform-profile
>> [3] https://docs.kernel.org/admin-guide/abi-testing-files.html#abi-file-testing-sysfs-class-platform-profile
>> [4] https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
>>
>> --
>> ~ Kurt