UD5: Flickering Dual-View with DVI and DisplayPort-to-DVI Adapter

Symptom

Some UD5 clients show a flickering screen if dual-screen configuration is used with the following combination:

This symptom only appears, if the client is cold, in most cases after the first boot after some time "off". The screen connected to the adapter starts flickering as soon as the xserver is started. It happens every time for about 5-20 minutes. On some clients the behavior is very extreme, on some clients its hardly visible. There might be some kind of digital noise with a dark wallpaper in use.

Problem

This might be the result of a clock generator tolerance on the mainboard. It was fixed in IGEL Linux 4.11.100 by changing a register inside the graphics driver.

Solution