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

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

[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.

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

[Armin Wolf]

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

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

[Anton Karasev]

Hi Armin,

I have the same machine as Martiya (Redmi Book Pro 16 2024, DMI
XIAOMI / TM2309, BIOS RMAMT6B0P0B0B, which is the latest BIOS Xiaomi
publishes for this model). In case it is useful to have it on the list,
here is its full acpidump (all tables, acpidump -o):

  https://bugzilla.kernel.org/attachment.cgi?id=310971

What the tables say about the Mifs interface on this BIOS, and what I
verified on the machine:

- The method is \_SB.PC00.WMID.WMAA, in the SSDT with OEM Table ID
  XMCC1806. It implements only command 0x08 (GET and SET), 0x0a
  subcommand 5, and 0x10 (GET subcommands 1-3, SET subcommand 2 only).
  Other command IDs answer 0xE000, including WMI_FN_SYSTEM_AC_TYPE,
  which your "Treat WMI_FN_SYSTEM_AC_TYPE as optional" patch now
  handles; unhandled subcommands mostly return status 0.

- The SET branches set only the return code and leave the function id
  at 0; only the GET branches fill it in. So on this BIOS "Detect failed
  function calls" reports every SET as failed with -ENOMSG, although the
  firmware applies it -- the same as Chris reported for the Xiaomi Book
  Pro 14 in "Only check the function id of GET responses". Verified with
  the for-next driver built for 7.2.7: every profile write failed with
  -ENOMSG while the EC mode changed; with Chris's patch on top, all of
  them succeed.

- The mode values are not the Bitland ones. SET of 0x08 stores the value
  in the EC register QFAN as is, and NTDP in the DSDT maps QFAN to the
  DPTF variable \_SB.ODV1: 0/1 balanced (ODV1 0), 2 quiet (2), 3
  performance/Turbo (1), 4 full speed/Geek (4). With your two patches
  the AC type check now passes on AC, and the value "performance" writes
  (3) happens to be Turbo here; "balanced-performance" writes 1, which is
  balanced, and after Fn+K to balanced (QFAN 1) platform_profile reads
  back balanced-performance. On battery performance is still refused by
  power_supply_is_system_supplied(), although the firmware accepts Turbo
  there.

- Command 0x10 is the battery interface on this firmware (subcommand 2
  is the 80 % charge protection), which makes the existing kb_mode
  attribute dangerous: writing "fixed" to it turns charge protection off.
  Verified on the machine.

I have put the details, including the test results, in a reply to
[PATCH v6 5/5] of the redmi-wmi merge series, since that is where the
per-machine table is being discussed. I am happy to test patches on
this model.

Thanks,
Anton Karasev