Hi Ebus,
What version of hdmi cable are you using 1.4 , 1.3 or 1.2 ?
This can be important for good quality playback.
I use Hdmi 1.4 and good quality cable.
Update to Kodi 16 :
sudo add-apt-repository ppa:team-xbmc/xbmc-nightly
sudo apt-get update
sudo apt-get install kodi
If you have any addons (such as PVR clients), these must be updated as well (they will not be updated automatically).
Settings > video > acceleration > render method > software
I have render method set to AUTO DETECT and is ok but you can use SOFTWARE.
No problems for me , i only run 1080p movies. If you try to play games , this will not work well.
Ebus, have a look at this link , this might help you.
I do not want to experiment with my settings as nvidia for me is working well.
http://askubuntu.com/questions…-and-xbmc-with-nvidia-331
I hope this helps.
Regards.