After installing newest Nvidia drivers, my kde5 desktop has suffered this error: (from Xorg.0.log)
(EE) [mi] EQ overflowing. Additional events will be discarded until existing events are processed. (EE) (EE) Backtrace: (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4a) [0x55b91a15b9fa] (EE) 1: /usr/lib/xorg/Xorg (mieqEnqueue+0x253) [0x55b91a13d4b3] (EE) 2: /usr/lib/xorg/Xorg (QueuePointerEvents+0x52) [0x55b91a00e002] (EE) 3: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f76c95b6000+0x6277) [0x7f76c95bc277] (EE) 4: /usr/lib/xorg/modules/input/evdev_drv.so (0x7f76c95b6000+0x6a8d) [0x7f76c95bca8d] (EE) 5: /usr/lib/xorg/Xorg (0x55b919fa2000+0x95438) [0x55b91a037438] (EE) 6: /usr/lib/xorg/Xorg (0x55b919fa2000+0xba8f2) [0x55b91a05c8f2] (EE) 7: /lib/x86_64-linux-gnu/libc.so.6 (0x7f76cfb07000+0x35860) [0x7f76cfb3c860] (EE) 8: /lib/x86_64-linux-gnu/libc.so.6 (nanosleep+0x10) [0x7f76cfbd3700] (EE) 9: /lib/x86_64-linux-gnu/libc.so.6 (usleep+0x34) [0x7f76cfc05664] (EE) 10: /usr/lib/xorg/modules/drivers/nvidia_drv.so (0x7f76ca85e000+0x57ca55) [0x7f76caddaa55] (EE) (EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack. (EE) [mi] mieq is *NOT* the cause. It is a victim. [ 7409.944] nvLock: client timed out, taking the lock [ 7409.945] [mi] Increasing EQ size to 1024 to prevent dropped events. [ 7409.945] [mi] EQ processing has resumed after 33 dropped events.
After this error, you cannot change from one virtual desktop to other anymore, but programs what are at current desktop are running (of course) still usable.
Basically only thing what can be done at situation like this is “service lightdm restart”
I’m not allowed to attach files (few kB file is “too big”), so Xorg.0.log can be found https://drive.google.com/open?id=0B_nQziZUPvaubVpHYTN2dWVMaHc