This is not a “tip” - just thought I’d mention an ugly glitch I’m having with a multiple monitor setup at work :
Ubuntu 18.04.1 on a Dell E7250 (16 GB RAM 512 mSATA SSD - 1366x768 screen)
Dell docking station
2 x Dell 24" monitors attached via displayport to docking station
The monitors will blink and go black for a few seconds “every so often” (maybe once an hour? no rhyme or reason - but seems to happen more often when the machine is busy [e.g. booting a VM in virtualbox] and playing music at the same time… most times they come back on - sometimes they stay off (and screens complain about no signal) - and I have to either undock, or unplug one of the monitor’s DP leads from the docking station, then reconnect… it’s a PITA… I’ve rebuilt the laptop from scratch and same issue… everything I’ve read seems to point to the operating system trying to do “sound” over displayport… some fixes seem to be to “mute” that displayport/HDMI sound device (didn’t work)… another fix? plug 3.5 mm headphones into one of the headphone ports - nada - doesn’t fix… nothing seems to fix it! I’ve replaced the docking station too!
It never happens when I dock the Windows 10 laptop on my desk (but I barely ever use it as I detest using Windows) to the same docking station/monitor setup…
I’ve got multiple monitor setups at home - even odd monitor combinations - e.g. my gaming “rig” desktop machine (Phenom II X6, 12 GB RAM GTX650ti - proprietary drivers) has a 24" 1680x1050 and a 19" 1280x1024 - no problems at all…
And for a while I used this same Dell laptop at home on a docking station, with 2 x 24" Dell monitors - the only difference being that only one of them was using displayport and the other DVI… so it would seem uniformity is more problematic than diversity!