I found a great 19" touchscreen (that just works when you plug it in to the Pi 3 with an unalterd system) on ebay at http://www.ebay.com/itm/BK-SEMS-19-Touc ... Swv9hW3dCh, but I want to run it in portrait mode.
I managed to add a line to /boot/config.txt to turn the screen 90 degrees, but the touch interface naturally did not follow. I found drivers for redhat, Ubuntu & Fedora here: http://www.inexio.co.kr/07_download/download02.html but I don't really know enough to utilize them.
I obviously want to swap axes on the touchscreen, but any tutorials I've found were for the smaller official touchscreens.
Since the driver was already there, it seems to me that swapping the axes would be a feature of that driver, but I cannot discover what it is. I pulled a lsusb and found it listed as port 5, dev 6, class=hid Driver=usbhid, 12M (verified by removing and re-adding it).
I really need to turn that touchscreen for a kiosk demo we're building for a show on the 17th of April, 2016.
We can go landscape if we need to, but our hearts are set on portrait! Can anyone help on this? Thanks, groovy Pi people!
