[BUG] Redmi Book Pro 16 2024 platform_profile write fails on Linux 7.1.7

Hello,

I am testing Linux kernel support on a Xiaomi Redmi Book Pro 16 2024 laptop.

I found a problem with platform_profile handling on the Arch Linux 7.1.7 kernel.

Hardware:

Laptop: Xiaomi Redmi Book Pro 16 2024
Model: TM2309
CPU: Intel Core Ultra 7 155H (Meteor Lake)
BIOS: RMAMT6B0P0B0B
BIOS date: 06/10/2025


Kernel comparison:

Problematic kernel:

Linux 7.1.7-arch1-1

Reference kernel:

Linux 6.18.43-1-lts

On Linux 6.18.43 LTS the platform_profile sysfs interface is not
exposed, so the issue cannot be reproduced there.

Installed packages:

linux 7.1.7.arch1-1
linux-lts 6.18.43-1
power-profiles-daemon 0.30-1


Problem description:

On Linux 7.1.7 the platform_profile interface exists and exposes the
following profiles:

$ cat /sys/firmware/acpi/platform_profile_choices

low-power balanced balanced-performance performance


Current profile:

$ cat /sys/firmware/acpi/platform_profile

balanced


Reading the current profile works correctly, but writing some profiles fails.


Working example:

$ echo low-power | sudo tee /sys/firmware/acpi/platform_profile

Result:

low-power


Verification:

$ cat /sys/firmware/acpi/platform_profile

low-power


However, the following profiles fail:

$ echo performance | sudo tee /sys/firmware/acpi/platform_profile

Result:

performance
tee: /sys/firmware/acpi/platform_profile: Operation not supported


Same behavior with:

$ echo balanced-performance | sudo tee /sys/firmware/acpi/platform_profile

Result:

balanced-performance
tee: /sys/firmware/acpi/platform_profile: Operation not supported


The same issue causes power-profiles-daemon failure:

$ powerprofilesctl set performance

Failed to communicate with power-profiles-daemon:

Failed to activate platform driver 'platform_profile':
Failed to write to acpi_platform_profile:
Error writing '/sys/firmware/acpi/platform_profile':
Operation not supported (15)


Expected behavior:

All profiles listed in:

/sys/firmware/acpi/platform_profile_choices

should be writable successfully, especially:

balanced-performance
performance


Actual behavior:

Writable:

- low-power
- balanced

Not writable:

- balanced-performance
- performance


Module information:

Linux 7.1.7:

$ modinfo redmi_wmi

filename:
/lib/modules/7.1.7-arch1-1/kernel/drivers/platform/x86/redmi-wmi.ko.zst

srcversion:
E64350B38255B1100E64863


Linux 6.18.43 LTS:

filename:
/lib/modules/6.18.43-1-lts/kernel/drivers/platform/x86/redmi-wmi.ko.zst

srcversion:
369C9F3502463ADD78FDC0F


Dmesg information:

The laptop is detected correctly:

DMI:
XIAOMI Redmi Book Pro 16 2024/TM2309

WMI device:

input:
Redmibook WMI keys


No specific redmi_wmi error appears in dmesg.


Additional observation:

On Linux 7.1.7:

$ powerprofilesctl

performance:
CpuDriver: intel_pstate

balanced:
CpuDriver: intel_pstate
PlatformDriver: placeholder


The platform profile backend is detected but cannot switch to
performance or balanced-performance.


Possible affected components:

- drivers/platform/x86/redmi-wmi
- platform_profile framework
- processor_thermal_soc_slider
- ACPI platform profile handling


I can provide additional logs, ACPI tables, or help with testing
patches if needed.

Thank you.