Re: [Linuxwacom-devel] [PATCH] First version of Button Image setting

[Eduard H. <eha...@gm...>]

2011/9/29 Peter Hutterer <pet...@wh...>:
>> Ah, finally I understand the whole picture which Ping wanted me (us)
>> to tell. I see it similar. When looking at the 4 leds, I'm seeing
>> something like a software settable "rotary selection switch".
>> Applications want to be informed immediately when the value changes.
>> If not, the user would see the switch is on position B, while the
>> software thinks its still on A, and behave wrongly.
>
> That's a software bug then. Clients will get notified about LED changes.

This is the puzzle piece i'm missing. How, if not by means of a
(virtual) axis, will the clients be notified about led changes? The
way how I see it currently is that without axis the clients will need
to poll the led status all the time with XGetDeviceProperty.

Thanks,
Eduard