Making weston (or maybe libinput) ignore an input device

[Matt Hoosier]

On Thu, Dec 7, 2017 at 2:05 AM, Pekka Paalanen <ppaalanen at gmail.com> wrote:
> On Tue, 5 Dec 2017 13:57:39 -0600
> Matt Hoosier <matt.hoosier at gmail.com> wrote:
>
>> Hi all,
>>
>> The thing I'd like to arrange is for a device which is otherwise a
>> valid keyboard, not to get automatically vacuumed up into the Weston
>> DRM backend's usage of libinput.
>>
>> Nowadays, Weston has delegated most of its former firsthand extraction
>> of UDev properties to libinput. Nothing exists (that I found) in
>> Weston's immediate sources to cause an input device reported through
>> the libinput UDev seats to be ignored. I also had a quick stroll
>> through libinput to look for some kind of sensitivity to a UDev
>> property with that effect, but didn't spot anything likely.
>>
>> Is there a best way to do this? The best thing I could think of was to
>> try to add a late-running UDev rule that subtracts out the
>> ID_INPUT_KEYBOARD=1 property, so that libinput won't know what to do
>> with the device. But that seems like a fragile solution -- some
>> package unknown to me could come along and install an even-later
>> running rule that messages that arrangement up.
>
> Hi Matt,
>
> you could try assigning that device to a different physical seat with
> the ID_SEAT property:
> https://wayland.freedesktop.org/libinput/doc/latest/udev_config.html

Aaaah, right. Thanks, that did the trick.

>
> There is also LIBINPUT_IGNORE_DEVICE mentioned on that page.
>
> Some talk about physical vs. logical (wl_seat) seats:
> https://wayland.freedesktop.org/libinput/doc/latest/seats.html
>
> A compositor usually handles only one physical seat, and Weston in
> particular does so.
>
>
> Thanks,
> pq