Re: [BUG] HID: i2c-hid: ELAN 04F3:30FD touchpad reset race causes -EREMOTEIO on HP Pavilion Gaming 15-ec1xxx

On Mon, Aug 10, 2026 at 07:31:32PM +0200, Adam wrote:
> Hello,
> 
> I'm reporting a reproducible probe failure for an ELAN i2c-hid touchpad
> (ACPI ELAN0718:00, VID:PID 04F3:30FD) on an HP Pavilion Gaming 15-ec1033nw
> (AMD platform, i2c bus under AMDI0010:03). The touchpad fails to
> initialize on nearly every boot on Linux, while the same hardware works
> reliably every time under Windows 11 on the same machine (dual context,
> same BIOS F.35 rev.A).
> 
> Kernel: 7.1.6-arch1-1 (Arch Linux)
> Also reported by other users with the same touchpad ID on different
> kernels/distros (Arch, Ubuntu, Linux Mint) going back to at least 2022:
> - https://bbs.archlinux.org/viewtopic.php?id=277393
> - https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2031061
> - https://forums.linuxmint.com/viewtopic.php?t=329212
> 
> Symptom (default logging):
> 
>   i2c_hid_acpi i2c-ELAN0718:00: failed to fetch HID descriptor: -121
>   i2c_hid_acpi i2c-ELAN0718:00: Failed to fetch the HID Descriptor
>   i2c_hid_acpi i2c-ELAN0718:00: probe with driver i2c_hid_acpi failed with
> error -121
> 
> With dynamic_debug enabled for i2c_hid and i2c_hid_acpi:
> 
>   i2c_hid_start_hwreset
>   i2c_hid_set_power: cmd=05 00 00 08
>   i2c_hid_xfer: cmd=05 00 00 01
>   i2c_hid_finish_hwreset: waiting...
>   i2c_hid_finish_hwreset: finished.
>   asking HID report descriptor
>   i2c_hid_xfer: cmd=02 00
>   reading report descriptor failed
>   can't add hid device: -121
>   probe with driver i2c_hid_acpi failed with error -121

Could you attach full dmesg with debug enabled, of failing boot and
successfull boot? And also acpidump?

Thanks,
Lovekesh