[Solved] Partial rendiging error since 1.2
 

I recently upgraded the Displaylink drivers from 1.1.62 to 1.2.65.

Since the update I experience glitches. I attached a screenshot to outline the problem. I simple moved the browser window around.

https://imgur.com/m6ML1MI https://imgur.com/m6ML1MI

My current setup:
Ubuntu 16.04 with XFCE as desktop environment.
Intel Corporation HD Graphics 520
Linux 4.4.0-45-generic x86_64
ThinkPad USB 3.0 Pro Dock
X.Org X Server 1.18.4

I'm willing to debug/assist with the developers to resolve this issue.

Update:
---------
I reenabled the compositor under 'Window Manager Tweaks' => Compositor. See this video https://www.youtube.com/watch?v=3esPpe-fclI for a better understanding of X11 and the compositors responsibility.

Is there a way to force full screen repaints in XFCE? If yes, does it mitigate the problem?

We'll try to reproduce the problem in house. Could you attach logs gathered with our Linux Support Tool?

Regards,
Michal

Use the XFCE compositor (or another one) to perform full-screen repaints. (though this may be taxing on the CPU with DisplayLink).

You can also mitigate this issue by having the compositor determine which areas need repainting.
i.e. I use compton with --glx-use-copysubbuffermesa.

I experience this issues as well on Linux Mint with Cinnamon.

It only happens on one of the screens. On my screenshot you can see how i dragged the window across.

My setup is:
Linux Mint 18 Cinnamon 64-bit
Cinnamon 3.0.7
Kernel 4.4.0-45-generic
Intel(R) HD Graphics 4600
Dell D3100 Dock
X.Org X Server 1.18.4

Edit:
After reboot it seems like both of the screens have the issue. Not sure what I did to make it work on one of them.

Thx. I did disable the built in composite for some reason. I enabled the composite and the error went away.
I watched https://www.youtube.com/watch?v=3esPpe-fclI to understand the reason to run a composite.

I had the same problem initially with Mint 18 and Cinnamon. I found a video somewhere targeted at Ubuntu but it works in mint.

Add these lines to /etc/environment
CLUTTER_PAINT=disable-clipped-redraws:disable-culling
CLUTTER_VBLANK=True

I'll be honest, I have no idea what that does, but it works.

I'll try to find the link again.

Thanks! That solved my issues as well.