Dashed borders of my window manager (XFce)

Solution 1:

(Originally posted by user226952 at Dashed borders of my window manager (XFce) - Solution.)

I ran into the same problem as posted here and I found out that the problem only exists on my Intel video laptops (Nvidia was fine) and occurred only with themes having window borders with more than 1px width.

My solution was to create a file /usr/share/X11/xorg.conf.d/20-intel.conf with the content :

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

This switches off sandy bridge acceleration and turns back to slower but reliable uxa acceleration.