Dual monitor problem
I'm running Fedora 29, kernel 5.04. I usually use KDE/Plasma desktop I have 2 monitors - a Samsung (HDMI) and an Acer (DVI). The Acer is set up as the primary display.
Everything was working until a few days ago. A cable was bumped and the secondary display went black. Cables were all checked & re-fitted. The secondary display was still black.
On re-boot, POST messages displayed on the Samsung monitor as usual. The login prompt displayed on the Samsung. The KDE splash screen appeared on both monitors for a little while before going black. The desktop came up - no second display.
When I go into system settings/monitors - the system knows the second monitor is there but won't talk to it.
If I switch to GNOME desktop both monitors display properly.
Any ideas on what has gone wrong?
Have you looked at Plasma's screen/display settings? You can always restore them to defaults and set up again to your preference.
Sounds like your monitor setup file got corrupted. Check this file in your homedir: "./.config/monitors.xml"
I have reset the Plasma screen settings several times. The secondary monitor remains grayed out - even after reboot. Under Gnome, I can see/rearrange both monitors.
There were 2 monitor.xml files (one was "xml~") so I renamed them and tried rebooting - still no luck. The only difference between the files is one has the Samsung monitor listed first, the other has the Acer listed first. The actual settings for each monitor are the same.
What's in
xrandroutput? What if you delete (move) those files?xrandr -q gives the following:
DVI-I-0 connected 1280x1024+1920+220 (normal left inverted right x axis y axis) 376mm x 301mm 1280x1024 60.02+ 75.02
1152x864 75.00
1024x768 75.03 70.07 60.00
800x600 75.00 72.19 60.32 56.25
640x480 75.00 72.81 59.94
DVI-I-1 disconnected (normal left inverted right x axis y axis) HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 509mm x 286mm 1920x1080 60.00+ 59.94 50.00