Arch Linux

CodingThunder

Member

Registered: 2024-11-01

Posts: 2

[Solved] Asus TUF F15 - CPU freq locked at 400MHz manual fan control

When I set /sys/class/hwmon/hwmon5/pwm1_enable and /sys/class/hwmon/hwmon5/pwm2_enable to 1, which sets the cpu fans to manual mode. The cpu fan speeds can be then controlled using:

/sys/class/hwmon/hwmon5/pwm1_auto_point1_pwm
/sys/class/hwmon/hwmon5/pwm1_auto_point1_temp
/sys/class/hwmon/hwmon5/pwm1_auto_point2_pwm
/sys/class/hwmon/hwmon5/pwm1_auto_point2_temp
/sys/class/hwmon/hwmon5/pwm1_auto_point3_pwm
/sys/class/hwmon/hwmon5/pwm1_auto_point3_temp
/sys/class/hwmon/hwmon5/pwm1_auto_point4_pwm
/sys/class/hwmon/hwmon5/pwm1_auto_point4_temp
/sys/class/hwmon/hwmon5/pwm1_auto_point5_pwm
/sys/class/hwmon/hwmon5/pwm1_auto_point5_temp
/sys/class/hwmon/hwmon5/pwm1_auto_point6_pwm
/sys/class/hwmon/hwmon5/pwm1_auto_point6_temp
/sys/class/hwmon/hwmon5/pwm1_auto_point7_pwm
/sys/class/hwmon/hwmon5/pwm1_auto_point7_temp
/sys/class/hwmon/hwmon5/pwm1_auto_point8_pwm
/sys/class/hwmon/hwmon5/pwm1_auto_point8_temp
/sys/class/hwmon/hwmon5/pwm1_enable

When the cpu fans are set to manual, no matter what speed I put them to, cpu frequency of all cores is limited to 400MHz. Setting /sys/class/hwmon/hwmon5/pwm1_enable and /sys/class/hwmon/hwmon5/pwm2_enable back to 2 (auto), brings back the cpu frequency to what they should be. Also a weird behaviour I noticed, just setting /sys/class/hwmon/hwmon5/pwm2_enable to 2, also sets the former to 2. I tried using cpupower to change the cpu frequency, but it didn't make any change

Just want to know how I can remove this 400MMhz limit cause it makes my laptop around atleast 6x slower

Last edited by CodingThunder (2025-02-28 17:54:37)

CodingThunder

Member

Registered: 2024-11-01

Posts: 2

Re: [Solved] Asus TUF F15 - CPU freq locked at 400MHz manual fan control

Seems like a firmware bug. Updating the bios with fwupd, magically resolved the bug. Wild the changelog only contained that it was a security fix containing the latest list of forbidden signatures.