2nd Monitor Detected And On But Screen Is Black

English Hardware
#1

Hi everyone, I am having a weird issue with my recent Tumbleweed install. While I am able to display windows on my 2nd monitor and it is being detected, the screen is entirely black, almost as if the desktop isn’t extending past my primary monitor. I can almost live with it except for the fact that if I decide to go fullscreen on said 2nd monitor the browser window or whatever other application I am using on that monitor goes completely black too. I am currently running the 460.32.03 proprietary driver and my video card is a GTX 1060 6GB. Oddly enough, if I go into my NVIDIA X Server settings the X Server Information says that I have 1 screen despite the 2nd monitor being detected. I have messed around with numerous display settings in both NVIDIA X Server as well as the Display Configuration settings in KDE but so far nothing has fixed it.

Has anyone had this sort of issue before? If so, were you able to solve it and how? I am new to these sort of troubleshooting issues and openSUSE itself, so if there is any command I should run to help diagnose this issue that I am missing, please let me know. Below is my xrandr output, if there is any other command I should run please let me know and I’ll get back to you.

Screen 0: minimum 8 x 8, current 3840 x 1200, maximum 32767 x 32767 
DVI-D-0 disconnected (normal left inverted right x axis y axis) 
HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm 
   1920x1080     60.00*+  59.99    59.94    50.00    60.05    60.00    50.04   
   1680x1050     59.95   
   1600x1200     60.00   
   1440x900      59.89   
   1366x768      59.79   
   1280x1024     75.02    60.02   
   1280x960      60.00   
   1280x720      60.00    59.94    50.00   
   1152x864      75.00   
   1024x768      75.03    70.07    60.00   
   800x600       75.00    72.19    60.32    56.25   
   720x576       50.00   
   720x480       59.94   
   640x480       75.00    72.81    59.94    59.93   
DP-0 disconnected (normal left inverted right x axis y axis) 
DP-1 connected 1920x1200+1920+0 (normal left inverted right x axis y axis) 550mm x 340mm 
   1920x1200     59.95*+ 
   1920x1080     59.94    50.00    60.00    50.04   
   1680x1050     59.95   
   1440x900      59.89   
   1440x576      50.08   
   1280x1024     75.02    60.02   
   1280x960      60.00   
   1280x720      60.00    59.94    50.00   
   1152x864      75.00   
   1024x768      75.03    70.07    60.00   
   800x600       75.00    72.19    60.32    56.25   
   720x576       50.00   
   720x480       59.94   
   640x480       75.00    72.81    59.94    59.93   
DVI-D-1 disconnected (normal left inverted right x axis y axis)
#2

Oh, this might help describe my issue a little better
https://i.imgur.com/81Cob39.png

#3

Most users of multiple displays have only one “screen” as Xorg defines it](https://nouveau.freedesktop.org/MultiMonitorDesktop.html). This includes yours. A short way to describe an Xorg “Screen” is anywhere on the desktop one pointing device can reach.

I’ve seen what you describe before, but it’s been a while. I don’t remember much, other than being concerned little about it.

First thing to do is check if it also happens when you log into an IceWM session instead of Plasma.

Something to try is making the 1920x1200 screen primary. You can easily test this:

xrandr --output DP-1 --primary

Is one screen still black this way?

Something else might be Kscreen and NVidia’s proprietary driver stepping on each other for control. It might be worth disabling KScreen in systemsettings > startup & shutdown > background services.

https://susepaste.org/61348399

As the screenshot shows (assuming it works in submit - the https://forums.opensuse.org/showthread.php/549759-2nd-Monitor-Detected-And-On-But-Screen-Is-Black?p=3000947#post3000947 image is ignored in preview), Plasma with 2 displays (comprising one screen) is working here using the upstream default modesetting DDX driver.

#4

Some user had a similar issue. I sent these images and he fixed it:

http://www.mistelberger.net/Bildschirm1.png

http://www.mistelberger.net/Bildschirm2.png

#5

Thanks for the response, sorry for the late reply but I broke my install on accident and had to fix it. Anyway, I installed icewm and I do not have this same issue when using it, although I have another issue using icewm where I couldn’t connect to Wifi for some reason. When I changed my primary monitor over to my 2nd monitor, the desktop came back but then the desktop went away on my first monitor. It seems that I get no visible desktop on anything that isn’t set as my primary display. Disabling KScreen 2 did not do anything to fix this issue. I could go use icewm for the time being, although I need to figure out why I cannot connect to Wifi when using it.

#6

Only in Plasma, right?

I could go use icewm for the time being, although I need to figure out why I cannot connect to Wifi when using it.
This should be a new thread in the network/internet forum if you can’t solve it on your own.

Something else to try is whether this is an NVidia driver problem. If you uninstall (per NVidia’s instructions) and reboot, does the problem in Plasma remain? If you then

sudo zypper rm xf86-video-nouveau

and reboot, does the problem in Plasma remain? If neither, then you have a good reason to goto NVidia’s forums for suggestions, or just keep using either modesetting DDX driver or nouveau DDX driver.