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Bug#1150950: linux-image-7.2.10+deb14-amd64: ACPI BIOS ERROR hard blocks wlan interface at boot -cannot be unblocked through software

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On Thu, Oct 15, 2026 at 02:14:01AM +0100, Josh Burke wrote:
>    * What exactly did you do (or not do) that was effective (or
>      ineffective)?
>    When booting my machine, ACPI BIOS ERROR's appear, showing that Field D008 exceeds the target buffer size. I believe this causes something in the ACPI to act as if my machine's wifi kill switch is permanently on.
> So, specifically this is the error's I'm seeing on boot:
> _AML_BUFFER_LIMIT, Field [D008] at bit offset/length 128/8 exceeds size of targe>
> od \_SB.WMID.HWMC due to previous error (AE_AML_BUFFER_LIMIT) 20250807/psparse-5>
> od \_SB.WMID.WMAD due to previous error (AE_AML_BUFFER_LIMIT) 20250807/psparse-5>

This means it is a firmware problem.  The ACPI code is invalid and newer
Linux versions actually check this.

> ** Command line:
> BOOT_IMAGE=/@boot/vmlinuz-7.2.10+deb14-amd64 root=UUID=fae26db8-2a31-42f3-b082-8c0174ab81a3 ro rootflags=subvol=@ quiet splash acpi_osi=! blacklist=hp_wmi

Why are you overriding the ACPI OS setting with "acpi_osi=!"?  Please
try without, esp older firmwares use sometimes weird selections based on
this.

> ** Model information
> sys_vendor: Hewlett-Packard
> product_name: HP Pavilion g6 Notebook PC
> bios_vendor: Insyde
> bios_version: F.25

Please see if you can find a newer firmware/BIOS for this device.  As
this is now over 15 years old, it is unlikely to be fixed anywhere.

What you can do is: override the ACPI table with a fixed one, but what
fixed mean might be hard to figure out.  The process is outlined in
https://www.kernel.org/doc/html/latest/admin-guide/acpi/initrd_table_override.html

Bastian

-- 
There is a multi-legged creature crawling on your shoulder.
		-- Spock, "A Taste of Armageddon", stardate 3193.9

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Bug#1150950: linux-image-7.2.10+deb14-amd64: ACPI BIOS ERROR hard blocks wlan interface at boot -cannot be unblocked through software Josh Burke <josh@joshburke.co.uk> - 2026-10-15 03:20 +0200
  Bug#1150950: Error messages Josh Burke <josh@joshburke.co.uk> - 2026-10-15 03:30 +0200
  Bug#1150950: linux-image-7.2.10+deb14-amd64: ACPI BIOS ERROR hard blocks wlan interface at boot -cannot be unblocked through software Bastian Blank <waldi@debian.org> - 2026-10-26 14:10 +0100

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