I'm field testing a corporate setup as part of our R&D. I'm running a Windows 8.1 Dell XPS 12. Last week, I ordered two of the S2340T external monitors for use with my setup. In the past, I've been able to successfully run two external monitors, for a three monitor setup. When I connected the first S2340T, everything worked great.
When I connected the second one, I lost touch-screen capability on the first one. On the second one, when I touched that screen, it was interacting as if I was touching the PC's own display, despite that it was properly running it as an extended desktop.
I finally found that each monitor needs to be running with the USB cable (I found this in a year old forum, even theough the instructions I received still made no mention of the necessity.)
Right now I have full touch on the Mobile PC display, as well as the first S2340T (monitor 1) that I connected. The second one that I connected (monitor 2) takes any touch action and correlates to the space within the mobile PC display. If I disconnect Monitor 1, then Monitor 2 will function perfectly as designed. If I then plug Monitor 1 back in, it will not function properly, allowing any touch on it immediately to show as a touch command on the Mobile PC display (thus mimicking the issue I had when the monitors were reversed).
I've fully replaced drivers from Dell, even the ones that it says are up to date. I've disabled and upgraded. At this point, I don't know what to try next. Dell recently told me to update my Bluetooth driver for a separate issue, and immediately following, I lost the Bluetooth connectivity option and the functionality of my Bluetooth mouse.
Any thoughts or ideas would be greatly welcome.