Re: [PATCH] Revert "Input: synaptics - enable SMBus for HP Elitebook 850 G1"

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Hi Vishal,

On Sat, Nov 07, 2026 at 01:10:52AM +0530, Vishal Tyagi wrote:
> Commit f04f03d3e99b ("Input: synaptics - enable SMBus for HP Elitebook 850 G1")
> added PNP ID "SYN3003" to smbus_pnp_ids[] to enable SMBus/InterTouch mode.
>
> However, on Haswell-generation HP EliteBooks sharing this touchpad controller
> (including HP EliteBook 840 G1 and HP EliteBook 850 G1), the touchpad fails
> to resume after ACPI S3 suspend:
>
>   rmi4_smbus 0-002c: failed to get SMBus version number!
>   rmi4_f01 rmi4-00.fn01: Resume failed with code -6.
>   rmi4_physical: Failed to resume rmi4-00: -6

Could you please try the patch recently posted by Markus Rathgeb (CCed)
that retries reading the SMBus version on -ENXIO during resume, and see
if it resolves the S3 resume issue on your EliteBook without reverting
SMBus support:

https://lore.kernel.org/linux-input/20261105204953.69572-1-maggu2810@mailbox.org/

Thanks.

-- 
Dmitry