August 29, 2022 at 10:35 #39908
If I connect to a virtual screen instead of an existing desktop session, the KDE taskbar is missing.
Same happens on both Manjaro and Gentoo. I first thought it was a gentoo issue but it wasn’t.
Default manjaro installation.
DE: Plasma 5.24.6
WM: KwinAugust 29, 2022 at 15:13 #39924
Please follow the configuration tips for Arch-based installations which are from a separate topic:
I’ve pasted them here for your convenience
1. Create a backup of nx PAM configuration (sudo cp -a /etc/pam.d/nx /etc/pam.d/nx.original). Then change /etc/pam.d/nx in this way:
auth include system-login account include system-login password include system-login session include system-login
2. Change DefaultDesktopCommand in /usr/NX/etc/node.cfg in order to have this on KDE:
DefaultDesktopCommand "/usr/bin/dbus-launch --sh-syntax --exit-with-session /usr/bin/startplasma-x11"
3. Stop display manager:
sudo systemctl stop display-manager
4. Restart NoMachine:
sudo /etc/NX/nxserver --restart
Does the taskbar appear?August 29, 2022 at 19:53 #39929
No, that just gave me a black desktop. I think the issue I was facing was due to that it tried to connect to a running Xorg server and it couldn’t find the display/screen which’s a somewhat known problem on laptops if the lid is closed.
However I also would like to have to be able to chose between a virtual desktop or running Xorg server. If I have Xorg running it connects me straight to that “session/server”. I can’t figure out what configuration I need to change for that.August 30, 2022 at 13:31 #39944
If you have the lid closed on the laptop you should stop the graphic interface and use it as a headless machine. The remote session will then work as a virtual session (see this article for futher information: https://kb.nomachine.com/AR03P00973). hen connecting via NoMachine to a headless Linux, it will detect that no display is running and ask you if you want to create one.
If the lid is open, Xorg will work as it should and physical sessions will work correctly.August 30, 2022 at 14:34 #39947
Yea, adding a dummy display made things work, no black screen… I’ll play around some more later, I need to tweak the configs a bit.August 31, 2022 at 08:48 #39950
There are some tricks to get it working even if the lid is closed. You can also add a custom resolution if you’re limited by the laptop screen resolution.
I’m now logged in to the X server session when the lid was closed, running in 1080p (the laptop screen supported only 720p), KDE taskbar works and there’s no slowness/lag.
To get the display running when the lid is closed you need to do the following:
1. First find your display id (in this case it’s, eDP-1), just run
xrandrin an X terminal window.
2. Make a script containing the following and put it in KDE Autostart as a login script, make sure the script is executable (chmod a+x <script>):
#!/bin/sh (sleep 5s && xrandr –output eDP-1 –auto) &
3. Add custom 1080p resolution to the session, run this in an X terminal window:
xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync xrandr --addmode eDP-1 "1920x1080_60.00"
4. Change to the 1080p resolution in gnome/kde/xfce or whatever DE you’re running.
No dummy display dongle neeeded!September 1, 2022 at 12:38 #39970
I can’t edit the above post but I finetuned the scripting a bit, and adding plasmashell –replace at the end solves all problems.
!/bin/sh (sleep 5s && xrandr --newmode "1920x1080_60.00" \ 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync && xrandr --addmode eDP-1 "1920x1080_60.00" \ && xrandr --output eDP-1 --auto && plasmashell --replace) &September 1, 2022 at 14:39 #39975
Maybe the low resolution the headless physical display had was the cause of the KDE problems. Glad to know you’ve solved your issues anyway. Although I’m not quite sure if you’ve resolved the “black screen” or “missing kde taskbar” 🙂September 2, 2022 at 07:55 #39984
I did manage to get the virtual desktop working but I felt the performance wasn’t the same as using the Xorg server session, so I went ahead trying to fix that session instead.
Regarding the missing KDE taskbar in the session, specifically the Xorg session, the command
plasmashell --replacefixes it.
xrandr --output eDP-1 --autocommand in the script fixes the slowness if the lid is closed on the laptop.
The xrandr modelines adds a custom 1080p resolution, my laptop screen supports 1080p but the mode isn’t detected automatically, so those lines doesn’t apply for everyone.September 2, 2022 at 20:00 #40022
In our case, we also found that
DefaultDesktopCommand "env DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$(id -u)/bus /usr/bin/startplasma-x11"
should be enough to start virtual sessions on Arch/manjaro with KDE Plasma.
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