From: Paul Menzel <pmenzel@molgen.mpg.de>
To: Peter Hutterer <peter.hutterer@who-t.net>
Cc: "Pali Rohár" <pali@kernel.org>, linux-input@vger.kernel.org
Subject: Re: No pinch events with Dell laptops and Alps
Date: Tue, 18 Aug 2020 15:13:45 +0200 [thread overview]
Message-ID: <e2bcaf1e-2fa0-0d6e-0b51-646f1de2d206@molgen.mpg.de> (raw)
In-Reply-To: <20200716232223.GA527251@koala>
Dear Peter,
Am 17.07.20 um 01:22 schrieb Peter Hutterer:
> On Thu, Jul 16, 2020 at 03:19:32PM +0200, Paul Menzel wrote:
>> On the Dell Latitude E7250 and Dell Precision 3340 I fail to get three
>> finger pinch events generated needed for GNOME Shell gestures [1].
>>
>> Debian Sid/unstable with Linux 5.7.6 is running on these systems.
>>
>> [ 1.602394] input: AlpsPS/2 ALPS GlidePoint as
>> /devices/platform/i8042/serio1/input/input2
>>
>> I am only able to create swipe events. (Four finger swipe works to switch
>> workspaces.)
>>
>> ```
>> $ sudo libinput debug-events
>> […]
>> -event1 DEVICE_ADDED AlpsPS/2 ALPS GlidePoint seat0 default
>> group10 cap:pg size 98x51mm tap(dl off) left scroll-nat scroll-2fg-edge
>> dwt-on
>> -event2 DEVICE_ADDED DELL Wireless hotkeys seat0 default
>> group11 cap:k
>> event1 - AlpsPS/2 ALPS GlidePoint: kernel bug: Wrong slot count (4),
>> reducing to 2
>> -event1 GESTURE_SWIPE_BEGIN +1.549s 3
>> event1 GESTURE_SWIPE_UPDATE +1.549s 3 -0.36/ 0.26 (-2.59/ 1.85
>> unaccelerated)
>> […]
>> ```
>>
>> Does the hardware and driver support that?
>
> The device is an Alps GlidePoint which are usually INPUT_PROP_SEMI_MT. On
> those devices, we don't support 3fg pinch gestures because we don't get
> enough data to make the gestures reliable. There is no specific quirk for
> your device otherwise, afaict.
Thank you for your reply, and the explanation.
Four finger gestures seem to work. At least in GNOME Shell workspaces
can be switched with that.
> If it's not semi-mt then it's too hard to say without more data, I'll need
> at least the output from libinput record to figure out why (that recording
> will contain the libinput version which also matters).
Sorry for omitting that. It’s 1.16.1 now. I uploaded the logs [2].
Kind regards,
Paul
[2]:
https://owww.molgen.mpg.de/~pmenzel/20200818-libinput-record-linux-5.7.10.txt
next prev parent reply other threads:[~2020-08-18 13:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-16 13:19 No pinch events with Dell laptops and Alps Paul Menzel
2020-07-16 23:22 ` Peter Hutterer
2020-08-18 13:13 ` Paul Menzel [this message]
2020-08-18 21:59 ` Peter Hutterer
2020-08-19 16:06 ` Paul Menzel
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