Re: hp-wmi: WHCM AE_AML_OPERAND_TYPE and fan init -22 on HP OmniBook 5 16-ag1xxx (board 8DF4)

[Krishna Chomal <krishna.chomal108@gmail.com>]

On Fri, Oct 16, 2026 at 09:06:03AM +0200, Lorenzo Collevecchio wrote:
>Subject: Re: hp-wmi: WHCM AE_AML_OPERAND_TYPE and fan init -22 on HP
>OmniBook 5 16-ag1xxx (board 8DF4)
>
>Hi Krishna,
>
>Thanks a lot for digging into the ACPI code, the explanation makes
>everything fit: the missing GMCF call for HPWMI_GM, Local2 being left
>as an Integer, and the -22 coming from that.
>
>I also tried your suggestion about the platform profile. With
>HPWMI_READ/WRITE the errors should not appear:
>
>  Before: dmesg | grep -c WHCM  ->  3 (the three boot-time errors)
>  cat /sys/firmware/acpi/platform_profile  ->  quiet
>  After:  dmesg | grep -c WHCM  ->  3 (no new errors)
>
>On the fan: thanks for confirming that acpi_fan reads the EC value
>correctly. Together with hearing the fan on Mint and on CachyOS at
>idle, that makes me fairly comfortable that the 0 RPM readings are the
>fan really being off.
>
>Your plan to query the fan count and hide pwm1_enable and
>fan{1,2}_input when it fails sounds good to me. I am happy to test it
>on 8DF4 whenever you have a patch, and I can rebase it onto a stable
>kernel tree on my side if that is easier for you.
>
>I also tried 7.2.10-1-cachyos: dmesg and the hp-wmi hwmon folder are
>identical to 7.2.9 (three WHCM errors, then the -22 message, and
>pwm1_enable still present).
>
>Thanks again for the time you spent on this.

Thanks, I will share the final proposed patch on your Bugzilla report
(222138), and leave this thread for others to pick up the WQBC/WQBE
errors.

>Best regards,
>Lorenzo
>
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