Unable to get events from my touchscreen in Weston using libinput

[Pekka Paalanen]

On Tue, 30 Sep 2014 11:57:31 +0100
Aurelien Bouin <a_bouin at yahoo.fr> wrote:

> Hello,
> 
> Thank you for your answer !!
> It was exactly that ! The only way I had to understand what was wrong with the touch was to add weston_log into src/input.c ...
> I feel like weston-calibrator is not really usefull ...

Oh yeah... I can see weston-calibrator would not work at all in a case
where the device coordinates are *so* much off they never even hit the
weston-calibrator's window.

> 
> What I actually did to solve my problem was to add a rule to udev into /etc/udev/rules.d with this kind of datas inside :
> ATTRS{name}=="ADS7846 Touchscreen", ENV{WL_CALIBRATION}="-0.211380 -0.007522 1739.4189 -0.000290 0.143116 -632.012695"
> 
> I manually computed thoses 6 datas with the /etc/pointercal generated by tslib ...
> FYI =>
> Supposing in /etc/pointercal you have those 9 variables :
> a b c d e f g h i
> Then the 6 variables to set are ENV{WL_CALIBRATION}="a/g b/g c/g d/g e/g f/g"
> 
> Hope it will help someone...

That's a good find. We would really need some way to calibrate
even when the device coordinates are really wild.


Thanks,
pq

> 
> Now I am trying to make GTK+3 working with touchscreen with wayland backend since it has not been supported in the 3.12 ...
> 
> Thank you again for the time !
> 
> Aurelien BOUIN
> 
> 
> 
> Le Mardi 30 septembre 2014 12h24, Pekka Paalanen <ppaalanen at gmail.com> a écrit :
> 
> 
> 
> On Wed, 24 Sep 2014 16:59:44 +0100
> 
> Aurelien Bouin <a_bouin at yahoo.fr> wrote:
> 
> > Hello,
> > 
> > I am using weston-1.6.0 with wayland-1.6.0 libinput-0.6.0 compiled for ARM with yocto
> > When I start weston I can see that the touch is detected in the logs : 
> > """[13:28:20.166] input device 'ADS7846 Touchscreen', /dev/input/event0 is a touch device """
> > Here is the complete log : http://pastebin.com/raw.php?i=dHjWSH16
> > But I am unable to get a launcher launch ... or weston-calibrator do not detect a touch ...
> > 
> > What is wierd though is that when weston goes to screensaver ... when I touch the screen it wakes up ... 
> > I can see event with event-debug the tools of libinput ...
> > I tried export WAYLAND_DEBUG=1 ... I am sure that debug is enable since there is a bunch of messages at start up ... but i get nothing on touch event ... when I plug a mouse then I get event when the mouse is moving ...
> > 
> > 
> > Where should I look to ?
> 
> Hi,
> 
> maybe the coordinates are somehow completely off... you could try
> adding weston_log() in src/input.c notify_touch() to print the
> coordinates (use e.g. wl_fixed_to_int()).
> 
> If the coordinates do not hit any surface, you won't see them in the
> protocol debug either.
> 
> 
> Thanks,
> pq