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

Am 11.08.26 um 20:55 schrieb Martiya Aryan Mehr:

> 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.

Sorry for the late reply. Could you please share the output of "acpidump"?

Thanks,
Armin Wolf