Just a quick update. Upgraded to KDE Plasma 5.7 and the problem persist if I don't use R600_DEBUG=nodma. This is the modeline I'm running (it uses VGA out) > xrandr --newmode 1366x768 85.50 1366 1436 1579 1792 768 771 774 798 > +hsync +vsync > xrandr --addmode DisplayPort-2 1366x768 > xrandr --output DisplayPort-2 --mode 1366x768 - Mads On 2016-06-22 18:30, Mads wrote: > Just throwing this out there, but the Carrizo with the issues is > running a custom modeline with resolution 1366x768. Don't know if this > is of any significance at all, but thought you should know at least. > > Can provide the modeline if necessary. > > - Mads