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From: Rain <rain@sunshowers.io>
To: linux-input@vger.kernel.org
Subject: Missing ABS_PRESSURE/ABS_MT_PRESSURE for SYNA7DB5:00 06CB:CD7E (Acer Swift Edge 16 SFE16-43)
Date: Thu, 07 Sep 2023 15:00:19 -0700	[thread overview]
Message-ID: <2bbb8e1d-1793-4df1-810f-cb0137341ff4@app.fastmail.com> (raw)

Hi there --

I have a new Acer Swift Edge 16 (model SFE16-43) I'm trying out and it
looks like on OpenSUSE Tumbleweed, as of kernel 6.4.12, the touchpad
is missing the ABS_PRESSURE and/or ABS_MT_PRESSURE device bits. The
device itself works fine, but without pressure information I think
there seem to be some finger detection issues (specifically, light
enough touches don't appear to register).

I'm not sure if the hardware itself doesn't support these bits
or if a quirk needs to be added to the kernel. I'm happy to help try
and figure this out. My understanding is that all modern Synaptics
touchpads support pressure information, though I could certainly be
wrong about that.)

Some debugging output that might be useful. Happy to provide more
as necessary:

---
# uname -a
Linux cumulus 6.4.12-1-default #1 SMP PREEMPT_DYNAMIC Fri Aug 25 08:26:31 UTC 2023 (f5aa89b) x86_64 x86_64 x86_64 GNU/Linux

# libinput measure touchpad-pressure       
Using SYNA7DB5:00 06CB:CD7E Touchpad: /dev/input/event2

This device does not have the capabilities for pressure-based touch detection.
Details: Device does not have ABS_PRESSURE or ABS_MT_PRESSURE

# dmesg | grep SYNA                 
[    2.034760] input: SYNA7DB5:00 06CB:CD7E Mouse as /devices/platform/AMDI0010:00/i2c-0/i2c-SYNA7DB5:00/0018:06CB:CD7E.0001/input/input1
[    2.034865] input: SYNA7DB5:00 06CB:CD7E Touchpad as /devices/platform/AMDI0010:00/i2c-0/i2c-SYNA7DB5:00/0018:06CB:CD7E.0001/input/input2
[    2.036331] hid-generic 0018:06CB:CD7E.0001: input,hidraw0: I2C HID v1.00 Mouse [SYNA7DB5:00 06CB:CD7E] on i2c-SYNA7DB5:00
[    2.266243] input: SYNA7DB5:00 06CB:CD7E Mouse as /devices/platform/AMDI0010:00/i2c-0/i2c-SYNA7DB5:00/0018:06CB:CD7E.0001/input/input5
[    2.266501] input: SYNA7DB5:00 06CB:CD7E Touchpad as /devices/platform/AMDI0010:00/i2c-0/i2c-SYNA7DB5:00/0018:06CB:CD7E.0001/input/input6
[    2.266821] hid-multitouch 0018:06CB:CD7E.0001: input,hidraw0: I2C HID v1.00 Mouse [SYNA7DB5:00 06CB:CD7E] on i2c-SYNA7DB5:00

---

A thing that's a bit strange to me is the separate reporting of mouse and
touchpad devices. I don't know if that's a red herring or a clue.

Reporting this directly here per similarity to [1] which was closed in libinput.

Thank you!

[1] https://gitlab.freedesktop.org/libinput/libinput/-/issues/780

                 reply	other threads:[~2023-09-07 22:00 UTC|newest]

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