Dell ST2220T Touchscreen Monitor stops working after kernel update

[saturnine_sweet]

When I update the Kubuntu kernel from 3.0.0.12 to 3.0.0.14, touch function stops working. in .12, it works, if only as a single touch, not as multitouch. After update, touching the screen only brings up panel options.

Does anyone have some helpful hints on this? I haven't really dug into the problem much yet, but was hoping for a little direction so I don't have to sift through everything. Im fairly new to Linux, though by and large I am familiar with all the common procedures, commands, etc, as they are mostly the same as other environments in concept, just different in terminology. I suspect that this kernel issue isnt just a matter of a simple setting, as the base kernels for the other distros I sampled had similar issues with the hardware, which is what lead me to Kubuntu in the first place. This leads me to think that how touch screens--or at least this particular screen--are handled on a kernel level has changed in some fundamental way from .12 to .14. But, again, Im pretty new to this game, and might just be barking up the wrong tree.

[saturnine_sweet]

Re: Dell ST2220T Touchscreen Monitor stops working after kernel update

A little help? lol I tried the daily of 12.04 LTS, still no dice. its been added to the HID driver in the main kernel, it appears, but isn't in the Kubuntu kernel at this point. How would I go about fixing this issue?

[SteveRiley]

Re: Dell ST2220T Touchscreen Monitor stops working after kernel update

Touch input is still very much a work in progress. I'd recommend you investigate a project called TouchEgg.

You can revert to prior behavior by re-installing the older kernel and then pinning it so that it won't be upgraded. What is your touch device, and what module is/was it using?

[saturnine_sweet]

Re: Dell ST2220T Touchscreen Monitor stops working after kernel update

Touchegg doesn't really address what I was speaking of, really, as I haven't got to the point of customizing input options. I know how to use the old kernel, but there are issues with that, too, so I had been looking at the new kernel, as well as the fact that 12.1 is slated to release in a few months, so if Im going to swap to Linux as a primary OS, I need functionality in new kernels. The device is recognized as "LG Display LGD-MultiTouch." From what I saw, the system picks it up fine. In any kernel over 3.0.12, touching the screen doesn't register the pointer at all, just brings up the panel options. In 3.0.12, the issue is that I cannot find a way to bind the pointer to JUST the touch display--rather, it automatically spans across both monitors in my setup, which renders it effectively useless. I can always just use WIndows, of course, but with the poor multimonitor support in Win7 and the entire "PC-as-an-appliance" concept of Win8, I was really hoping to jump ship to Linux, but every distro seems to have some giant flaw in what I hope to use it for. Which was what has kept me from Linux in the past, as it always seems a couple generations behind on hardware vs software, only running great on 2+ yr old hardware, which is about the time I phase my hardware out for new.

[SteveRiley]

Re: Dell ST2220T Touchscreen Monitor stops working after kernel update

You're right about TouchEgg. It really doesn't do what I thought. I've spent a couple hours working with it this evening, and it seems very selective about which devices it'll work with. I know that both the Synaptic touchpad and MosArt touchscreen on my laptop are multitouch devices, and xinput happily tells me all kinds of information, but TouchEgg seems not to even be aware that these devices exist. And there's precious little information in the wiki or support page.

If you don't already have it, you might consider installing the xinput package. You can reassign button mappings and other properties with that tool. I'm going to experiment with it during the next few days to see what I can come up with.