Date: Thu, 9 Nov 2023 18:30:53 +0100 From: Milan Obuch <freebsd-x11@dino.sk> To: freebsd-x11@freebsd.org Subject: Re: Touch screen with X multi monitor setup Message-ID: <20231109183053.4a9e3301@zeta.dino.sk> In-Reply-To: <e77f9843-b31e-1d92-7b4f-520d3d7fc002@blastwave.org> References: <20231109091010.349608ef@zeta.dino.sk> <e77f9843-b31e-1d92-7b4f-520d3d7fc002@blastwave.org>
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On Thu, 9 Nov 2023 10:47:56 -0500 Dennis Clarke <dclarke@blastwave.org> wrote: > On 11/9/23 03:10, Milan Obuch wrote: > > Hi, > > > > after some years using Acer T231H1 monitor for its monitor role, I > > decided now to try its touch screen interface. It uses USB > > interface, plugging it into my workstation shows just > > > > I also brought home a large touch screen back in 2014 or so. It > is actually an HP branded "digital display": > > LD4220tm LCD Interactive Display model XH216AA [ snip ] > s$ xrandr > Screen 0: minimum 320 x 200, current 5760 x 1080, maximum 16384 x > 16384 DisplayPort-0 connected primary 1920x1080+0+0 (normal left > inverted right x axis y axis) 930mm x 523mm > 1920x1080 60.00*+ 50.00 59.94 [ snip ] > DisplayPort-1 connected 1920x1080+1920+0 (normal left inverted right > x axis y axis) 521mm x 293mm > 1920x1080 60.00*+ 50.00 59.94 [ snip ] > DisplayPort-2 connected 1920x1080+3840+0 (normal left inverted right > x axis y axis) 521mm x 293mm > 1920x1080 60.00*+ 50.00 59.94 [ snip ] > DisplayPort-3 disconnected (normal left inverted right x axis y axis) > s$ > > So there you see Screen 0 on DisplayPort-0 where the resolution is > reported as 5760 x 1080. If I try to use the touch screen feature it > just maps the single monitor over that entire 5760 pixel wide stuff. So this situation is basically the same as that of mine. > > Acer monitor with touch screen is connected via DVI-D-1 connector in > > this case. Problem is absolute location of touch being not correct, > > coordinate Y (up/down) is OK, but coordinate X (left/right) is not. [ snip ] > I have not figured it out either but am willing to experiment a bit > and see what happens. Maybe we can sort out whatever magic is > required and here I do see : > > https://wiki.archlinux.org/title/Touchscreen I'll looke there for some ideas... > > And, one more idea, how could I use multiple touch screen monitors? > > At present, I have no such setup, but there are various small > > computers with multiple video connectors, often dual HDMI, so I can > > imagine it could be usefull. And how about rotated screen? For > > tablets and touch screen notebooks, it could be often the case (my > > GPD small notebook, not touch screen, has 1280x720 resolution, but > > it is actually rotated 720x1280 screen). > > Exactly the right questions. I am thinking that all my monitors can be > touch screen but then we need to sort out the mapping of the input. > Here I did find about something called libinput-tools in Debian Linux. Input, input, input... Ha! There is x11/xinput port, installing it, looking into xinput.1 man page, issuing xinput --map-to-output 12 DVI-D-1 et voila, it works as expected now! Thanks for hint! I am going to test it a bit more, but basically I am done now with this task. Regards, Milan
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