Bug 1294840

Same problem here. 

+ Dell Latitude E7450
+ Intel driver
+ Dell U2515H (secondary display)

And here... only happened since I dnf updated yesterday  (using FC22)
and received kf5-plasma-5.17.0-2.fc22.x86_64

Dell Optiplex 780SF with dual DVI.  Radeon HD3450 graphics.


In addition this plasma has some other serious issues... I had desktop
icons placed nicely on both screens and a couple of times it
lost the dual-head status and displayed same stuff on both screens,
and then decided to rearrange all my icons.  I had to reboot
the system to get dual-head status back again, but the icons are
now all misplaced (overlapping in some cases).

But... the icon maagement popups that allow me to resize/move the icons
no longer appears when I hover over the icons, so I can't put them
back where they should be!

Related to the dual screen mode fail the panel that was on the right
screen got dumped on top of the panel at the bottom of the left
screen.   I've moved it to another location on the left screen
so it doesn't overlap but I can't move it back to the right screen,
nor can I create a new panel there.

Help!

 grep plasma /var/log/dnf.rpm.log
Jan 05 19:59:00 INFO Upgraded: kf5-plasma-5.17.0-2.fc22.x86_64
Jan 05 19:59:00 INFO Upgraded: kf5-plasma-5.17.0-2.fc22.x86_64
Jan 05 19:59:53 INFO Upgraded: kdeplasma-addons-5.5.0-3.fc22.x86_64
Jan 05 19:59:53 INFO Upgraded: kdeplasma-addons-5.5.0-3.fc22.x86_64
Jan 05 20:02:31 INFO Cleanup: kdeplasma-addons-5.5.0-1.fc22.x86_64
Jan 05 20:02:31 INFO Cleanup: kdeplasma-addons-5.5.0-1.fc22.x86_64
Jan 05 20:02:41 INFO Cleanup: kf5-plasma-5.16.0-2.fc22.x86_64
Jan 05 20:02:41 INFO Cleanup: kf5-plasma-5.16.0-2.fc22.x86_64

kf5-plasma-5.17.0-2.fc22.x86_64 here as well, although the behaviour predates that.

This is a very annoying bug.  The problem is that the panel always migrates to th e first screen, is imposible to have a panel in the second screen.

If you edit the file plasma-org.kde.plasma.desktop-appletsrc and put lastscreen=1, when you start the session you could see the panel in the second screen just one second, and after an instant the panel migrates to the first screen.

Please, take a look, this is a very big usability problem when you have two screens.

The problem went away for me in a later update; I'm running kf5-plasma-5.19.0-2.fc22.x86_64 now

This bug is still present for me in kf5-plasma-5.19.0-2.fc22.x86_64.
@Ian: did you have to do anything in order to make the problem go away?

I noticed a change in behaviour, in that the new panel now gets added to the screen top edge rather than the bottom.

Can't recall anything special; I think I just did a remove panel of the excess one on the 1st screen and added a new one as normal to the 2nd screen.

I still occasionally find panels that stop working and need to be recreated...

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