[Wayland-bugs] [Bug 70253] Touch points are not mapped to the correct output in multi-display setup

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70253

--- Comment #2 from Brian Lovin <brian.j.lovin at intel.com> ---
I asked krh about this yesterday, there is a way to use the udev rules to
specify which touch device is mapped to which display - it's a udev environment
variable "WL_OUTPUT".

So like so for two touch monitors:
ENV{ID_VENDOR_ID}=="0XXX",ENV{ID_MODEL_ID}=="XXXX",ENV{WL_CALIBRATION}="-1.0935\
84 -0.022783 1514.135864 0.011188 1.339519 -115.937012",ENV{WL_OUTPUT}+="HDMI3"

If the touch device is has the previous VENDOR_ID and MODEL_ID and is plugged
into display HDMI3.

Is this written down somewhere? To remember the variable to use I had to grep
the source code...

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