Re: [Bug 221437] New: asus-wmi: gpu_fan RPM reads 0 on M6500XV when dGPU has no driver (fan physically spinning)

[Borislav Petkov]

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On Thu, Apr 30, 2026 at 01:39:35AM +0000, bugzilla-daemon@xxxxxxxxxx wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=221437
> 
>             Bug ID: 221437
>            Summary: asus-wmi: gpu_fan RPM reads 0 on M6500XV when dGPU has
>                     no driver (fan physically spinning)
>            Product: Platform Specific/Hardware
>            Version: 2.5
>           Hardware: All
>                 OS: Linux
>             Status: NEW
>           Severity: normal
>           Priority: P3
>          Component: x86-64
>           Assignee: platform_x86_64@xxxxxxxxxxxxxxxxxxxx
>           Reporter: nix.sasl@xxxxxxxxx
>         Regression: No
> 
> Summary of the issue:
> On ASUS Vivobook M6500XV with dGPU (RTX 4060) running without a driver
> (D3cold), the GPU fan physically spins under load but fan2_input always reads 0
> RPM. Writing to pwm2_enable fails with EIO.
> 
> Hardware:
> Product: Vivobook_ASUSLaptop M6500XV_M6500XV
> Board:   M6500XV
> BIOS:    M6500XV.309
> Kernel:  7.0.2-arch1-1
> linux-firmware-git: 20260429.56a13f98-1
> Relevant dmesg:
> asus_wmi: BIOS WMI version: 9.4
> asus_wmi: SFUN value: 0x21
> asus_wmi: fan_curve_get_factory_default (0x00110024) failed: -19
> asus_wmi: fan_curve_get_factory_default (0x00110025) failed: -19
> asus_wmi: fan_curve_get_factory_default (0x00110032) failed: -19
> 
> Findings:
> 
> fan2_input always 0 even when fan is physically spinning
> pwm2_enable node exists in sysfs but writes fail with EIO
> asus-ec-sensors rejects hardware with ENODEV
> ec_sys accessible but dump returns all zeros (interrupt-driven EC mode)
> dev_id reads 0x00000000
> 
> Expected behavior: fan2_input should report actual GPU fan RPM.
> 
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-- 
Regards/Gruss,
    Boris.

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