3

When I plug an additional screen to my laptop while the OS is running, there are mainly no problems. But:

  • when I move one of the screens to the other side of the second one in System Settings, the system logs out.

  • if I at first put one screen above the other and then set them as I wanted to, everything is ok.

  • if I run the system with both screens plugged, logging in through X is impossible: entering the password returns me back to the login screen.

  • logging out always makes the system forget the screens' settings.

These sometimes crash KDE (Plasma?) so much, that problem no. 3 appears always, even with the second screen plugged off. I managed to repair this case by removing the ~/.Xauthority file, but I'm not happy to do this all time. I have tried to remove ~/.local/share/kscreen files, clear ~/.cache, ~/.kde, but with no results.

I am using Kubuntu 15.10 (the lastest one) with KDE 5. I have an NVIDIA graphics card.

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2 Answers 2

Reset to default
1

I have the same problem and the way I've partially solved (as in it works most of the time, but not always) is by doing this after the forced logout:

  1. Unplug the second screen.

  2. Login.

  3. Open a terminal and run:

    rm .config/monitors.xml

    This removes the previously saved monitor configuration.

  4. Open Screen Display.

  5. Without changing any setting, just press Apply.

  6. Move the monitors to the setting you want, press Apply.

  7. You'll get an error dialog box, press OK.

Most of the time this works for me, until I reboot or power off. Then I have to repeat these steps all over again.

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  • At which step should it be plugged in? I may be having the same issue as you right now.
    – xeruf
    Nov 25, 2018 at 20:43
0

Hopefully OP resolved the issue as this might come in late but I'm just putting this here as others may encounter similar issue.

I encountered the same issue when i plugged in the additional monitors. No matter how I tried to sign in, I kept getting logged out. Only when i unplugged the monitors then am i able to sign in and enter the system. I suspected it might been due to the graphic card settings as i previously changed the prime-select settings to nvidia to make sure that I was able to use my dedicated NVIDIA graphic card as I have a AMD/NVIDIA graphic cards combo.

Hence, what i did was to change the prime select option to on-demand and this problem resolved for me.

$ sudo prime-select on-demand

The system I am using is Ubuntu 20.04 with integrated AMD Radeon 680M Graphics and dedicated NVIDIA 3070 Ti Graphics. Hopefully this might work for whoever that encountered this problem!

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