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Old 05-18-2016, 01:47 AM   #1
Knowbody
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Join Date: May 2016
Posts: 2
Default Graphical glitches when using OpenGL compositor in KDE

I've been able to install the Displaylink 1.1.62 drivers on my OS, which is:
* LMDE base install
* Debian sid repositories
* KDE Plasma with SDDM
* Intel Linux 1.4.0 graphics drivers

The hardware is:
* Toshiba Tecra 2 Z50-A
* i7-6500U + Integrated GPU
* Nvidia GT730M - which I haven't installed drivers for it and it isn't being used.
* Targus ACP70AU USB 3.0 dock which has the Displaylink outputs I'm using

I copied and pasted some of the commands from this script to install it:
http://displaylink.org/forum/showthread.php?t=64235

So anyway, I have a monitor connected to the HDMI port of the laptop itself, and a monitor connected to the HDMI port of the dock, and they're both working.

However, if I'm using OpenGL 2.0 or 3.0 as the compositor for KDE, I get some graphical glitches (copies of the mouse cursor left behind, etc), which does not happen if I use Xrender as the compositor, and also doesn't happen if I'm not using the Displaylink output and I am using OpenGL.
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Old 05-18-2016, 10:00 PM   #2
jhdl
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Join Date: May 2016
Posts: 7
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I get similar glitches - artifacts/copies of the mouse pointer.

I'm running Ubuntu Gnome 16.04 (not KDE). And using the Nouveau driver. I have a Dell XPS 15 9550 with nVidia gpu. Dell D3100 dock. Latest (May 16) display link driver.

The artifacts occur when running the mouse past window titles/menu bars, side scroll bars, and other such "boundaries". Some clean up after a few seconds, others clean up if you grab and drag a window.

Here's a picture for an example: https://drive.google.com/open?id=0B7...zlNc0xRWmt5S0k (attached, too)
Attached Images
File Type: jpg sc11.jpg (107.3 KB, 1 views)

Last edited by mlukaszek; 05-19-2016 at 12:20 PM.
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Old 05-24-2016, 11:17 PM   #3
dr_torch
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Join Date: May 2016
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I also have the same issue. If I use Xrender with KDE I do not see any artifacts, but I have a disappearing mouse pointer instead on the display that is connected directly to the laptop (not via the dock).

Has anyone had any luck solving these issues? It would be perfect if we could get this working 100%.

Cheers!
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