I have a notebook with a 7th gen i7 processor (Kaby Lake) and I use a setup with two external monitors, one is connected via HDMI, the other via Display Port.
This used to work fine until two weeks ago (I guess it was a kernel update). Now one of the screens randomly turns off and on again, sometimes 10 times in a row. Sometimes it's the HDMI screen, sometimes it's the Displayport screen. Sometimes the issue goes away when I unplug one of the monitors, sometimes it doesn't. Completely random.
And there's nothing in the system logs (
dmesg there are not graphics-related messages, only wifi.
The kernel I use at the moment is
4.10.0-38-generic #42~16.04.1-Ubuntu SMP
What can I do to diagnose this problem?