Related discussion in #ubuntu-desktop

18:24 < seb128> "we don't map touchscreens to an output, we map it to a portion 
of the desktop."
18:24 < seb128> " don't know how to fix this other than a database in the style 
of libwacom"
18:24 < tjaalton> that doesn't sound too promising..
18:24 < mlankhorst> probably needs to happen :/
18:26 < bregma> big problem with a generalized solution to that touchscreen 
problem is that there is no association between the touch device and the display
18:26 < mlankhorst> yeah..
18:27 < bregma> not even at the kernel level
18:28 < mlankhorst> but for now assuming touchscreen maps to the eDP or 
integrated screen would be best bet :/
18:29 < bregma> it would makea reasonable starting default but isn't anything 
like a good solution since there are lots of external touchscreens out there
18:30 < seb128> yeah
18:31 < mlankhorst> how are they handled on other platforms?
18:31 < seb128> it would also mean that if I dock my 3 years non-touch laptop 
on an external touch monitor things would be the wrong way around
18:31 < tjaalton> but confirmed..
18:31 < tjaalton> *bug
18:31 < mlankhorst> tjaalton: which?
18:31 < tjaalton> the touch one
18:32 < mlankhorst> ah
18:32 < tjaalton> i've got this lovely harris beach sdp..
18:32 < bregma> mlankhorst, how are they handled on other platforms? poorly, 
just like high-DPI
18:32 < tjaalton> now excuse me while it dist-upgrades trusty->trusty for the 
next two hours..
18:33 < tjaalton> hmm I have win8 on this too
18:35 < mlankhorst> could we make it a ui thing perhaps?
18:36 < mlankhorst> let the user suffer for next few years until things 
standardize :/

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https://bugs.launchpad.net/bugs/1287341

Title:
  Touchscreen controls both screens in dual-monitor setup

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