Bug 373836

Summary: Cannot use more than 1 screen
Product: [Plasma] plasmashell Reporter: unfa <unfa00>
Component: generic-multiscreenAssignee: Aleix Pol <aleixpol>
Status: RESOLVED WORKSFORME    
Severity: major CC: germano.massullo, kde, notmart, plasma-bugs-null
Priority: NOR    
Version First Reported In: 5.8.4   
Target Milestone: 1.0   
Platform: Mint (Ubuntu based)   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description unfa 2016-12-18 15:22:17 UTC 
I'm using a laptop with external monitor.
I have internal laptop display - let's call it A.
I have an external monitor connected via VGA - let's call it B.

I had severe problems with using the external monitor with Plasma 5.6.4.

Now I upgraded to 5.8.4 and initially I thought my problems are gone - I connected B - it was on, with it's own panel there.
I disconnected B - it was off, the B's panel was hidden, not falling back onto A, covering it's panel. Great! I suspened and restored the machine - now the problems are even worse. I reid rebooting - no luck. I am unable to use two monitors at the same time now after the upgrade.

When I run the laptop with B unconnected, A is running fine.
As soon as I connect B, A goes off. Panel and windows from A move to B, and now B is my only display.

When I disconnect B, A goes back on and the panel and windows go back to A.

In Plasma 5.6.4 I was able to finally get both A and B working by reconnecting B several times and reopening the Display Configuration several times. Now it doesn't help - I can never have both A and B on at the same time.

After connecting B I open the Display Configuration and I can see B enabled there, and A disabled - I enable A and hit Apply. As a result B is on, but goes all black and I only see the mouse cursor on it, while A is still off - not just black, there's no backlight.

I'm recovering my system to a state before upgrade to be able to use both screens again.
Comment 1 Marco Martin 2016-12-20 15:24:11 UTC 
can you paste here plasmashellrc and plasma-org.kde.plasma.desktop-appletsrc config files?
a screenshot of the display configuration would be useful as well.
Comment 2 Marco Martin 2016-12-21 17:12:09 UTC 
Git commit 6ae3a073dbd19869b5bbcdc4736c9e0bd0b5a51c by Marco Martin.
Committed on 21/12/2016 at 17:11.
Pushed by mart into branch 'master'.

consider an empty panel always "applets loaded"

if a panel doesn't ahve applets, it can't have a "currently
loading" as the status of its applets.
this fixes panels sometimes not showing up when reconnecting screens

M  +4    -0    src/plasma/containment.cpp

https://commits.kde.org/plasma-framework/6ae3a073dbd19869b5bbcdc4736c9e0bd0b5a51c
Comment 4 Germano Massullo (Thetra) 2018-12-04 16:26:15 UTC 
unfa could you please give us an update if you still experience this problem? Thank you
Comment 5 David Edmundson 2018-12-04 17:27:44 UTC 
marking as needs info till then
Comment 6 Bug Janitor Service 2018-12-19 03:44:15 UTC 
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!
Comment 7 Bug Janitor Service 2019-01-03 03:44:22 UTC 
This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!