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GTRONICK

Member

Registered: 2016-07-17

Posts: 41

Screen flickering after re enable desktop effects KDE Plasma

Hello everybody, and let me say thank you for your help.

What is the problem?

I noticed that, recording the screen with SimpleScreenRecorder, will produce videos with flickering. Also, if I disable the desktop effects and enable it again, and then, open Dolphin or system settings, hovering the mouse over any control will cause the screen to flicker, showing black spaces intermittently.

What have I tried?

- Use UXA as accel method on 20-intel.conf. This is the actual file:

#/etc/X11/xorg.conf.d/20-intel.conf

Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   Option      "AccelMethod"  "uxa"
   Option      "DRI"    "3" 
EndSection

- Use OpenGL 3.1 and Full Screen repaints for VSync, and Accurate scale method.
- Some people suggets to use GLX as OpenGL interface, but I can't find that option in System Settings.
- Use OpenGL 2.0
- Disable desktop effects and enable again.

What have worked?

- Scale Method: Smooth(slower)
- Rendering Backend: XRender
- Tearing prevention: Automatic

However, effects like Blur and Wobbly Windows get disabled. Also, the vertical Sync is affected, so, when you move a window fast, you can notice the screen refresh. I'm looking for a real solution for this, I mean, no flickering with OpenGL.

System information:

Plasma version: 5.9.1
KDE Framework version: 5.30.0
QT Version: 5.8
Kernel Version: 4.9.8-1-ARCH
OS Type: 64-bit
Video driver: x86-video-intel

Thanks in advance.

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,657

Re: Screen flickering after re enable desktop effects KDE Plasma

Remove that 20-intel.conf and xf86-video-intel, it is known to break KDE effects and largely unmaintained, and mostly the xorg built-in modesetting driver should be preferred in this case.

Last edited by V1del (2017-02-13 14:22:19)

GTRONICK

Member

Registered: 2016-07-17

Posts: 41

Re: Screen flickering after re enable desktop effects KDE Plasma

Hello!, Thanks for your advise. I have uninstalled xf86-video-intel, and removed the 20-intel.conf file. Then rebooted. However, the problem is still present. I forgot to mention that, I also have

mesa-libgl

, and

lib32-mesa-libgl

installed.

Last edited by GTRONICK (2017-02-14 02:00:17)

seth

Member

Registered: 2012-09-03

Posts: 51,017

Re: Screen flickering after re enable desktop effects KDE Plasma

export KWIN_USE_BUFFER_AGE=0
export KWIN_PERSISTENT_VBO=0
kwin_x11 --replace &

One of the variables is likely unneeded (so figure which it is, if this works)

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GTRONICK

Member

Registered: 2016-07-17

Posts: 41

Re: Screen flickering after re enable desktop effects KDE Plasma

Thanks, I tried it, but no luck. However, the animation speed is improved a little, but, when maximizing windows, the tittle bar dissapears, or only the half is shown.

Last edited by GTRONICK (2017-02-14 23:44:18)