jacmet at sunsite.dk
Mon Jun 8 23:54:45 PDT 2015
>>>>> "Peter" == Peter Hutterer <peter.hutterer at who-t.net> writes:
>> A typical use case is to set the coordinate transformation matrix for
>> touchscreens in multihead setups.
>> In the likely situation that the touchscreens are of the same type they
>> will have the same device name, so you need to fish out the
>> corresponding /dev/input/event* device node and pass it to udevadm info
>> (assuming that the server is local) to E.G. key off the ID_PATH
>> (E.G. the USB port the touchscreen is connected to).
> yeah, fair enough but that's not what I suspected from the original message
> (Kai only talks of a single device, afaict).
> related question for this case though: would xinput get-id call be
> interesting then? e.g. for two touchscreens you'd get
> $ xinput get-id "touchscreen"
> 12 16
Well, a bit - Bu you'd still need to extract the Device Node property
and pass it to udev, so it doesn't help much.
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