Have this bug too. Very frequent screen freezes, mouse only thing usable, unfrozen with Alt + Tab.
I've been running Plasma 5 for sometime without issue, the problem seemed to appear when I upgraded from 14.04.1 to 14.10.
I'm currently testing 15.04 and the bug is still present.
Will report back when I'm back by the laptop, re: hardware specs and OpenGL version.
Have this bug too. Very frequent screen freezes, mouse only thing usable, unfrozen with Alt + Tab.
I've been running Plasma 5 for sometime without issue, the problem seemed to appear when I upgraded from 14.04.1 to 14.10.
I'm currently testing 15.04 and the bug is still present.
Will report back when I'm back by the laptop, re: hardware specs and OpenGL version.