From: Peter Hutterer <peter.hutterer@who-t.net>
To: Paul Menzel <pmenzel@molgen.mpg.de>
Cc: "Pali Rohár" <pali@kernel.org>, linux-input@vger.kernel.org
Subject: Re: No pinch events with Dell laptops and Alps
Date: Wed, 19 Aug 2020 07:59:51 +1000 [thread overview]
Message-ID: <20200818215951.GA2732983@koala> (raw)
In-Reply-To: <e2bcaf1e-2fa0-0d6e-0b51-646f1de2d206@molgen.mpg.de>
On Tue, Aug 18, 2020 at 03:13:45PM +0200, Paul Menzel wrote:
> 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].
thanks. based on the log, it's not a semi-mt touchpad and has 5 slots. So gestures
should work in theory, let's move this to a libinput bug please and continue
there: https://gitlab.freedesktop.org/libinput/libinput/issues
Cheers,
Peter
next prev parent reply other threads:[~2020-08-18 22:00 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
2020-08-18 21:59 ` Peter Hutterer [this message]
2020-08-19 16:06 ` Paul Menzel
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