I'm using Kubuntu 15.10 with Plasma 5 about 2 weeks.

It has been a few updates, but the problem is still, and it prevent to work normaly.

I don't know what problem is it, but this happens only with Qt apps.

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So if i run open dialog from Firefox (which used GTK window?) or open Transmission app, they work normaly.

I tried check and uncheck of 'Processor microcode firmware for Intel CPUs'. Disable animation (ALT+SHIFT+F12). Select OpenGL render 3.1, 2.0, and so on.

I also tried diffirent version of drivers, currently i have Nvidia 352.41 (nvidia-352-update).

So there is my spec, maybe it's help a little bit.

  • Kubuntu 15.10 (64-bit)
  • KDE Plasma: 5.4.2
  • Qt: 5.4.2
  • Kernel: 4.2.0-18-generic
  • Processor: 4 x Intel Core i5-4590 CPU @ 3.30GHz
  • Memory: 8GB
  • Video: Nvidia GeForce GTX970

I really enjoy using plasma5 and KDE ecosystem, but this bug is very annoying.

Upd 17.11.15

This problem is also represented on Ubuntu 14.04.2 LTS.

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Qt:5.2.1 on this ubuntu PC. So problem is more global then just KDE and Plasma.

P.s. sorry for my english.

  • I switch render engine on OpenGL 3.1 and restart(!) all software, and this looks like solution. I'll work tomorrow, and write here this as solution.
    – Niklan
    Nov 15 '15 at 19:15
  • Bad news, problem is still here. :( Switch to OpenGL doesn't help.
    – Niklan
    Nov 16 '15 at 12:19
  • 1
    See this: askubuntu.com/questions/693136/… Nov 18 '15 at 11:26

So yes, native render for Qt is solution of this problem. Steps i'm doing to fixing:

  1. sudo nano /etc/environment
  2. Add new line to the bottom of the file (second line for me) with this QT_GRAPHICSSYSTEM=native
  3. Save and exit by pressing: CTRL+O, CTRL+X
  4. Reboot the system: sudo shutdown -r

Thats it.

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