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

Thanks for looking into this.

Attached:
- dmesg-failing-boot.txt - full dmesg from a failing boot, with
  i2c_hid.dyndbg=+p and i2c_hid_acpi.dyndbg=+p set on the kernel command
  line from the start, on the unpatched linux kernel (7.1.8-arch1-3).
- acpidump-output.txt - full acpidump output from the same machine.

Unfortunately I wasn't able to capture a successful boot for comparison
despite several attempts - in my experience the touchpad only initializes
successfully very rarely (I estimated roughly 1 in 10-15 boots when I was
testing before, but going by the last few days of retries it seems to be
even less frequent than that, maybe closer to 1 in 30+). I'm happy to keep
retrying over the coming days and send a successful-boot log if/when I
get one, if that's still useful.

Let me know if there's anything else that would help.

Thanks,
Adam

On Sat, Aug 15, 2026 at 9:33 PM Lovekesh Solanki <
lovekeshsolanki00@gmail.com> wrote:

On Mon, Aug 10, 2026 at 07:31:32PM +0200, Adam wrote:

quoted

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

quoted

(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

quoted

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