[Bug 222138] New: hp-wmi: HPWMI_GM queries fail with AE_AML_OPERAND_TYPE on OmniBook 5 16-ag1xxx (8DF4); firmware WHCM never calls GMCF

[Bug 222138] New: hp-wmi: HPWMI_GM queries fail with AE_AML_OPERAND_TYPE on OmniBook 5 16-ag1xxx (8DF4); firmware WHCM never calls GMCF

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=222138

            Bug ID: 222138
           Summary: hp-wmi: HPWMI_GM queries fail with AE_AML_OPERAND_TYPE
                    on OmniBook 5 16-ag1xxx (8DF4); firmware WHCM never
                    calls GMCF
           Product: Drivers
           Version: 2.5
          Hardware: AMD
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: Platform_x86
          Assignee: drivers_platform_x86@kernel-bugs.osdl.org
          Reporter: lorenzocollevecchio17@gmail.com
        Regression: No

Created attachment 311136
  --> https://bugzilla.kernel.org/attachment.cgi?id=311136&action=edit
acpidump

Hardware: HP OmniBook 5 Laptop 16-ag1xxx (16-AG1002SL)
Board: HP 8DF4
BIOS: F.12, 04/10/2026
Kernels tested: 7.2.9-2-cachyos, 7.2.10-1-cachyos; also seen on
Linux Mint 22.3 (6.14.0-37-generic)

Symptoms (every boot):
 - \_SB.WMID.WHCM aborts with AE_AML_OPERAND_TYPE (three times at boot)
 - hp-wmi: "Failed to apply initial fan settings: -22"
 - \_SB.WMID.WQBC / WQBE abort with AE_AML_OPERAND_VALUE (these go
   away with modprobe.blacklist=hp_bioscfg)
 - hp hwmon device exposes only pwm1_enable; no pwm1, no fan inputs
 - acpi_fan works (fan1_input)
 - ACPI thermal: Invalid critical threshold (-274000), no valid trip points

Analysis (Krishna Chomal, on the platform-driver-x86 list): in WHCM,
the case for command 0x00020008 (HPWMI_GM) only does "RTCD = RTCC" and
never calls the dispatcher GMCF. Local2 is therefore never assigned,
and the later DerefOf (Local2 [Zero]) fails on an Integer, producing
AE_AML_OPERAND_TYPE. HPWMI_READ/WRITE commands still work.
This is a firmware bug and cannot be fixed in the driver; a driver
change to hide pwm1_enable/fan inputs when the fan count query fails
has been proposed.

Related: bug 222107 (board 8D9C), bug 221385.
acpidump and dmesg attached.

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[Bug 222138] hp-wmi: HPWMI_GM queries fail with AE_AML_OPERAND_TYPE on OmniBook 5 16-ag1xxx (8DF4); firmware WHCM never calls GMCF

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=222138

--- Comment #1 from lorenzocollevecchio17@gmail.com ---
Created attachment 311137
  --> https://bugzilla.kernel.org/attachment.cgi?id=311137&action=edit
dmesg

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[Bug 222138] hp-wmi: HPWMI_GM queries fail with AE_AML_OPERAND_TYPE on OmniBook 5 16-ag1xxx (8DF4); firmware WHCM never calls GMCF

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=222138

Krishna Chomal (krishna.chomal108@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |krishna.chomal108@gmail.com

--- Comment #2 from Krishna Chomal (krishna.chomal108@gmail.com) ---
Created attachment 311148
  --> https://bugzilla.kernel.org/attachment.cgi?id=311148&action=edit
Proposed patch for disabling fan support in hwmon

Hi Lorenzo,

Could you test the proposed patch and check if the WHCM errors appear only once
during driver init and not regularly.

Also, all hwmon attributes have been disabled, this includes:
- pwm1_enable
- pwm1
- pwm2
- fan1_input
- fan2_input

Thanks

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