Re: tablet touchscreen configuration

Bruce Perens <[email protected]> Wed, 26 Feb 2014 14:36:18 -0800
Newsgroups	gmane.comp.gnome.devel
Message-ID	<[email protected]>
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    Carlos,<br>
    <br>
    Thanks very much for your response. I have jhbuild building the
    target gnome-world-3.12 . Is that the correct target? I built
    jhbuild from source, the one in Debian unstable is out of date and
    fails.<br>
    <br>
    Jhbuild wasn't able to find the dependency for iptables, although
    Debian unstable has "iptables" and "iptables-dev". So, after it
    nicely installed all other dependencies, I had to run "jhbuild build
    --nodeps".<br>
    <br>
    It's been chugging along for an hour without failing, given one core
    of the core i5-3437U on the toughpad. Nice to be able to build Gnome
    on a tablet while all of the interactive stuff keeps working!<br>
    <br>
    =C2=A0=C2=A0=C2=A0 Thanks<br>
    <br>
    =C2=A0=C2=A0=C2=A0 Bruce<br>
    <br>
    <div class=3D"moz-cite-prefix">On 02/26/2014 04:16 AM, Carlos Garnach=
o
      wrote:<br>
    </div>
    <blockquote cite=3D"mid:1393416996.28804.18.camel@sacarino"
      type=3D"cite">
      <pre wrap=3D"">Hi Bruce!,

On lun, 2014-02-24 at 21:35 -0800, Bruce Perens wrote:
</pre>
      <blockquote type=3D"cite">
        <pre wrap=3D"">Hi folks,

Is there a mailing list for tablet issues or tablet developers? I
didn't see one. Indeed the mailing lists that aren't for developers
seem to be for specific applications rather than the system itself.
So, please forgive me if this is misplaced.
</pre>
      </blockquote>
      <pre wrap=3D"">
It is true that there is no specific ML around touch/tablet support,
most activity happens in the wider <a class=3D"moz-txt-link-abbreviated" =
href=3D"mailto:[email protected]">[email protected]=
</a> , or on
specific clutter/gtk+ mailing lists.

</pre>
      <blockquote type=3D"cite">
        <pre wrap=3D"">
I've set up Gnome 3 from Debian unstable on a Panasonic Toughpad
FZ-G1. This has two sensor surfaces on the screen: a stylus that is or
emulates a Wacom, and an eGalaxy Touch which is a multitouch finger
touchscreen. Both are using evdev, the eGalaxy also has mtdev. Kernel
is 3.14 .

If anyone has tested this device with Gnome or indeed Linux, there
isn't any web evidence. It works, with a few little issues that I am
now running down.

The Wacom works correctly. The eGalaxy Touch mostly works, but
something is different about the button events. On the screen
keyboard, the buttons highlight when I touch them but they don't act
as if they've been pressed. This also happens on all of the shell
panel buttons. But finger-touch on a dock icon correctly launches the
program.
</pre>
      </blockquote>
      <pre wrap=3D"">
This was a known bug in gnome-shell 3.8, which is fixed in gnome-shell
3.10.

</pre>
      <blockquote type=3D"cite">
        <pre wrap=3D"">
In xev, button press and release events look identical between the two
devices.
</pre>
      </blockquote>
      <pre wrap=3D"">
xev reports legacy events that toolkits don't use that much anymore
nowadays... "xinput test-xi2" will report the more modern events that
gnome-shell and gtk+ applications see, XI_TouchBegin/Update/End between
those, it is the interpretation of those what was causing the trouble
here.

</pre>
      <blockquote type=3D"cite">
        <pre wrap=3D"">
Nice to see that Gnome 3 is mostly usable on tablets. I can probably
test multitouch when I get through this issue.
</pre>
      </blockquote>
      <pre wrap=3D"">
That's something that's improving over the late/future release
cycles :). Unfortunately, this also means that having the latest and
greatest would help in testing here...

Cheers,
  Carlos


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