RE: [BUG] Intel ISH (8086:E445) not working on Panther Lake - ACPI ISHD device missing _HID

>-----Original Message-----
>From: Zhang, Lixu <[email protected]>
>Sent: Wednesday, August 5, 2026 10:02 AM
>To: Zhang, Lixu <[email protected]>
>Subject: FW: [BUG] Intel ISH (8086:E445) not working on Panther Lake - ACPI
>ISHD device missing _HID
>
>From: mailto:[email protected] <mailto:[email protected]>
>Sent: Monday, August 3, 2026 7:07 PM
>To: Pandruvada, Srinivas <mailto:[email protected]>
>Cc: mailto:[email protected] <mailto:linux-intel-
>[email protected]>; mailto:[email protected]
><mailto:[email protected]>
>Subject: [BUG] Intel ISH (8086:E445) not working on Panther Lake - ACPI ISHD
>device missing _HID
>
...
>Firmware loading fails:
>```
>intel_ish_ipc 0000:00:12.0: ISH loader: load firmware: intel/ish/ish_ptl.bin
>intel_ish_ipc 0000:00:12.0: ISH loader: cmd 2 failed 10

Hi Frank,

` cmd 2 failed 10` means the firmware image loaded is wrong.
Please refer to https://lore.kernel.org/linux-input/SJ0PR11MB5613CE62B68CA4AD9B1ED33693D52@SJ0PR11MB5613.namprd11.prod.outlook.com/T/#u

>intel_ish_ipc 0000:00:12.0: ISH loader: cmd 0 failed 6
>intel_ish_ipc 0000:00:12.0: ISH loader: cmd 0 failed 6
>```
...
>
>## Questions
>
>1. Is Panther Lake ISH support planned for the upstream ISH driver?
The driver already supports the Panther Lake ISH.

>2. Does the ISHD ACPI device need a _HID for Linux to probe it?
No.

>3. Should the intel_ish_ipc driver call ACPI _DSM during initialization?
No.

>4. Is there a specific ISH firmware version needed for Panther Lake?

Please refer to https://lore.kernel.org/linux-input/SJ0PR11MB5613CE62B68CA4AD9B1ED33693D52@SJ0PR11MB5613.namprd11.prod.outlook.com/T/#u

Best regards,
Lixu