4K Resolution Issues

anlumo

Hello,

I'm running Ubuntu 18.04 on the AIO-3399J with a 4k screen (HDMI 2.0), and I'm having problems with the display. Everything flickers, the display turns off and back on again every few seconds, I sometimes get green dots in a regular pattern and video playback has a lot of artifacts (parts of the video shown in the wrong location etc).

Everything works fine at lower resolutions. Is there a way to fix this? I think I also had the same artifacts with the preinstalled Android 7.1.

anlumo

The higher resolutions are listed. The screen works fine on other machines with HDMI 2.0.