Re: [REGRESSION] platform/x86: bitland-mifs-wmi: platform profiles cannot be changed on USB-C-only RedmiBook Pro 15 (TM2017)

[Mingyou Chen <qby140326@gmail.com>]

On 10/22/26 16:08, Serhiy Shliapuhin wrote:
>> Can you avoid it by blacklisting bitland-mifs-wmi?
> Yes. With bitland-mifs-wmi blacklisted no platform_profile handler is
> registered, and power-profiles-daemon switches all three profiles via
> intel_pstate EPP again, same as before the driver was added.
>
> The same can be achieved by running power-profiles-daemon
> with --block-driver=platform_profile, which is what I use now.
>
>> And does it still happen with vanilla 7.3? 7.0 is long EOL upstream
>> (and 7.2 soon, too).
> Yes, it is reproducible with vanilla 7.3-rc3 (Ubuntu mainline build,
> no distro patches; newer mainline builds are not available yet -
> bitland-mifs-wmi.c has not changed since 2026-07-03 anyway).
>
>    $ uname -r
>    7.3.0-070300rc3-generic
>    $ cat /sys/class/platform-profile/platform-profile-0/name
>    bitland-mifs-wmi
>
>    low-power             -> accepted, reads back "balanced"
>    balanced-performance  -> -EOPNOTSUPP, stays "balanced"
>    performance           -> -EOPNOTSUPP, stays "balanced"
>
> Understood regarding 7.0; I only mentioned it as the last kernel
> where profile switching worked on this machine, before
> bitland-mifs-wmi was added.
>
> Thanks,
> Serhiy Shliapuhin
>
> On Wed, Oct 21, 2026 at 5:56 PM Thorsten Leemhuis
> <regressions@leemhuis.info> wrote:
>> On 10/20/26 07:12, Serhiy Shliapuhin wrote:
>>> On my RedmiBook Pro 15 (2021) none of the platform profiles exposed
>>> by bitland-mifs-wmi can actually be selected. "performance" and
>>> "balanced-performance" are always rejected with -EOPNOTSUPP, even
>>> while the laptop is charging, and "low-power" is accepted but has no
>>> effect. As a result power-profiles-daemon can only stay in Balanced.
>>>
>>> This is a regression. With Ubuntu kernel 7.0.0-38-generic [...]
>> Can you avoid it by blacklisting bitland-mifs-wmi? And does it still
>> happen with vanilla 7.3? 7.0 is long EOL upstream (and 7.2 soon, too).
>>
>> Ciao, Thorsten
>>
Hi, We're tracking this issue in the recent patch series.

https://lore.kernel.org/platform-driver-x86/20261021123414.25516-1-qby140326@gmail.com/T/#t