Comment 35 for bug 402892

Same problem on Lubuntu 14.04
Touchscreen: (MasterTouch MT-500 USB), supports only single touch.
Mouse not connected.

problem appears in next apps:
- Chromium: 62.0.3202.75
- Firefox 28.0

Sometimes MouseUp just not firing:
https://prnt.sc/hefody

then i close Chromium / Firefox with ALT+F4

but mouse still stuck in "MouseDown" state _systemwide_ :
https://www.dropbox.com/s/bf57bg47f3zsq2m/test.mp4?dl=0

Even if I connect the mouse to the computer after the problem occurs - the left mouse button will not work.

But mtpaint works fine! There is some difference in how mtpaint and (chromium, firefox) works with mousedown / mouseup events.

Any ideas? I need use touchscreen and don't need mouse. So i can't disable the touchscreen as recommended, because this will make the whole system unusable.

Thanks