"Don't know how to use device"

Simon Thum simon.thum at gmx.de
Fri Sep 26 03:14:18 PDT 2008

Søren Hauberg wrote:
> 2008/9/26 Simon Thum <simon.thum at gmx.de>:
>> Søren Hauberg wrote:
>>> (WW) TSC-10 DM TSC-10 DM: Don't know how to use device
>> Simply lookup evdev. Your kernel driver doesn't advertise buttons I guess,
>> so evdev thinks it can't handle it. Adding your case in EvdevProbe should do
>> the trick. The problem might become generating 'buttons' though.
> Okay, I don't know how I missed that -- thanks :-)
No problem.
> So, the 'usbtouchscreen' kernel only announces that it sends
> BTN_TOUCH, which is indeed the only thing it sends. The problem is
> that I can't just change how things work in the evdev X11 driver as
> that will most likely cause problems for people with touchpads. So,
> what is the proper solution? Should the touchscreens send a different
> signal (e.g. BTN_LEFT or possibly a new one called BTN_SCREENTOUCH)?
Well, I'm not so deep in that but anyway: I'd say if BTN_TOUCH is 
proper, evdev should cope with it. You could check for that and register 
the device using XI_TOUCHSCREEN. Then see how BTN_TOUCH behaves and try 
to guess a button press, maybe some threshold does it.

> P.S. Also CC'ing the list -- hope that's okay
It wasn't private by intent, just the wrong button.

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