I bet you do - kde has some real bastard issues with multi-monitor I've been finding.

If you're on 14.04, you're mostly hozed - they didn't fix kde remembering display setups until plasma 5.x.  This alone drove me into the 16.04 adventure with plasma 5.

I was actually just digging through their bugs when I saw this, there are a ton of issues with current releases in ubuntu and everything really, plasma 5.5 to current 5.7.1 all seem affected.

Now with 16.04 and plasma 5.5 on here, it remembers where my monitors go, but about everything else is broken.  Someone decided to remove a particular null monitor feature in kde that destroys it's ability cope with displays disappearing as things toggle around with xrandr functions, causing kwin, plasma, and about every other aspect of kde to freak out.  Now they seem to be trying to put it back, but so far everyone is still broken in 5.7.1.

Sadly most of these issues relate I found in the kde trackers around these issues are a year or more old, and they don't seem great about actually fixing old/persistent problems.  Seems they just keep making new features without fixing the old ones, like monitor placement in plasma 4. 

Easy for them to say "just upgrade to 5", but not when it requires a distro release upgrade, and then finding it is even more broken is slightly infuriating.

-mb


On 07/22/2016 09:07 AM, Stephen Partington wrote:
Odd KDE multi-monitor behavior with Optimus.

I have it working, and for the most part its great. But what i am getting now is some really strange behavior with Nvidia and Intel graphics.

Everything comes up and renders beautifully. I can even arrange them and move things back and forth. But anytime i move to the Intel controlled monitor (in this case laptop display) it slides the Nvidia controlled screens off to the side (or up if i set it below).

I have no idea where this behavior is controlled from and my google searching is coming up with nothing like it before. And while technically functional its kind of weird and not very helpful behavior.