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 <
[email protected]> wrote:

> 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
>