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