SUMMARY *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** STEPS TO REPRODUCE 1. Log into KDE with 3rd monitor attached/Attach 3rd monitor while logged in 2. Open Display settings 3. OBSERVED RESULT 3rd monitor not present in Display screen configuration or in drop-down menu of available monitors. 3rd monitor either remains dark or flickers with mirror of second monitor display. EXPECTED RESULT 3rd monitor should be visible and configurable in Settings This was working in Plasma 5.26 SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: 6.1.13-1-lts (available in About System) KDE Plasma Version: 5.27.1 KDE Frameworks Version: 5.103.0 Qt Version: 5.15.8 ADDITIONAL INFORMATION Graphics Platform X11 Using a USB-C hub to provide two additional monitor outputs
Also tried Wayland Session and behavior is the same.
Can you paste the output of `kscreen-doctor -o` before plugging in the 3rd screen, and afterwards? Also, when the 3rd screen is plugged in, can you run `kscreen-console bug` and paste the contents of the "EDID" sections for each detected screen? Thanks!
Created attachment 157130 [details] kscreen-doctor -o after pluggin in 3rd monitor This is the output after plugging in 2nd and 3rd monitors. Display settings shows both now, and both are checked as enabled, but they are not getting a signal.
Created attachment 157131 [details] This is the output of kscreen-doctor -o before monitors were plugged in This is output after system reboot. Plugging in monitors after worked as expected. This is a laptop and the system had been sleeping before the other attachment.
Thanks. The output shows four disabled DP screens in the "before" state. Are there actually 4 disabled DP screens? Do you have any docks or KVM switched or other display-related hardware plugged in?
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!
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!
Created attachment 158086 [details] kscreen-doctor output before
Created attachment 158087 [details] kscreen-doctor output after
I'm experiencing the same issue after updating to version 5.26.5 I've attached the kscreen-doctor outputs for before and after pluging the 3rd monitor (2nd external) In the KDE Settings -> Display Configuration, while my 2nd external is plugged in, the messages "An ouput has been removed. Settings have been reloaded." and "A new output has been added. Settings have been reloaded" appear few seconds each in a never ending loop. 3rd monitor works and mirrors the main monitor when in raw console/shell mode.
(In reply to kde from comment #10) > I'm experiencing the same issue after updating to version 5.26.5 > > I've attached the kscreen-doctor outputs for before and after pluging the > 3rd monitor (2nd external) > > In the KDE Settings -> Display Configuration, while my 2nd external is > plugged in, the messages "An ouput has been removed. Settings have been > reloaded." and "A new output has been added. Settings have been reloaded" > appear few seconds each in a never ending loop. > > 3rd monitor works and mirrors the main monitor when in raw console/shell > mode. UPDATE : I've been able to re-establish my 3rd monitor, but had to select the monitor that was constantly appearing/disappearing from the drop-down monitor selection box, then click on the Enabled checkmark, then fianlly click on Apply, all that within about 2 seconds (that took me about 15m to accomplish tho!) Will update if that occurs again and/or if I find relevant logs.
(In reply to kde from comment #11) > (In reply to kde from comment #10) > > I'm experiencing the same issue after updating to version 5.26.5 > > > > I've attached the kscreen-doctor outputs for before and after pluging the > > 3rd monitor (2nd external) > > > > In the KDE Settings -> Display Configuration, while my 2nd external is > > plugged in, the messages "An ouput has been removed. Settings have been > > reloaded." and "A new output has been added. Settings have been reloaded" > > appear few seconds each in a never ending loop. > > > > 3rd monitor works and mirrors the main monitor when in raw console/shell > > mode. > > UPDATE : I've been able to re-establish my 3rd monitor, but had to select > the monitor that was constantly appearing/disappearing from the drop-down > monitor selection box, then click on the Enabled checkmark, then fianlly > click on Apply, all that within about 2 seconds (that took me about 15m to > accomplish tho!) > > Will update if that occurs again and/or if I find relevant logs. UPDATE 2 : Just noticed that the 3rd monitor resolution was automatically set to 1080i instead of 1080p. The only way I could resolve this was to change to another resolution, apply it, accept it, then putting it back to 1920x1080 to recoved the 1080p resolution.
kde@assez.biz, can you please upgrade to Plasma 5.27, and if it's still happening, submit a new bug report for your issue? This one is being used for bginsburg's issue, which is almost certainly different in root cause from yours since you're using different hardware and Plasma versions and there was a major multi-monitor bug-fix spree for 5.27. bginsburg, can you provide information I asked for so we can keep triaging this issue? Or, if it's no longer happening for you, feel free to set the status to RESOLVED WORKSFORME.