topic Using touchscreen with 2 displays in i.MX Processors

Using touchscreen with 2 displays

yavuz_mutlu — Tue, 24 Sep 2019 11:49:03 GMT

Hi there,

I am trying to run Linux image on two displays. The displays are OK. However, only one of the displays have touchscreen. We run 2 different QT application on 2 different displays. The touchscreen interface runs, however, the touch events we make on the touchscreen display is responsive on the display that does not have touchscreen, what I mean is for example, when I touch the touchscreen coordinates 100,100 on the touchscreen display, the board thinks that I touched 100,100 coordinates on the display that does not have touchscreen.

I tried to change the primary display in the device tree, but no luck. I have done research on weston, again I could not find anything to redirect touch events to the touch display.

The board is iMX8 Quad Max

Weston uses xwayland backend, Yocto BSP version is 4.14.98

What should I do to accomplish this?

Re: Using touchscreen with 2 displays

b36401 — Wed, 25 Sep 2019 09:38:45 GMT

Please also try to swap display numbers (0<->1) in device tree and u-boot.

Re: Using touchscreen with 2 displays

yavuz_mutlu — Wed, 25 Sep 2019 12:30:52 GMT

Hi,

I asked the same question to the wayland-devel mailing group, and they recommended that I should add WL_OUTPUT property to the udev rules for the input device. When I set the WL_OUTPUT=LVDS-2, the problem seems to be solved.

Thanks.