[SOLVED] Only One Monitor Displays the Desktop Environment at a Time

ncerrone · 2022-12-15 12:07:47

So a general overview:
I left my desktop on last night. I returned to one of my monitors with no signal. The other was completely blank and only displayed my mouse. A reboot resulted in both monitors coming back to life, but only up until the login screen. After the desktop environment (KDE Plasma) boots, one of my monitors loses signal. After messing around with it a bit, I have figured out that as long as only one monitor is connected to my GPU, either monitor will work individually.

I just installed Arch yesterday and I'm fairly new to Linux overall, so let me know if there is any more info / logs I should provide. I've attached my Xorg.0.log from my last boot with both monitors attached.

Xorg.0.log: http://0x0.st/onwH.txt

Solution:
Delete the dirctory ~/.local/share/kscreen and reboot!
Deleting just the contents of the directory did not fix the problem.

Last edited by ncerrone (2022-12-15 18:44:11)

seth · 2022-12-15 14:37:37

Output of "xrandr -q"?

ncerrone · 2022-12-15 14:41:17

seth wrote:

Output of "xrandr -q"?

Screen 0: minimum 8 x 8, current 1920 x 1080, 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) 598mm x 336mm
1920x1080 60.00*+ 59.94 50.00 60.05 60.00 50.04
1680x1050 59.95
1600x1200 60.00
1440x900 59.89
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 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 connected (normal left inverted right x axis y axis)
2560x1440 59.95 + 165.00 144.00 120.00 99.95 84.98 23.97
1024x768 60.00
800x600 60.32
640x480 59.94
DP-5 disconnected (normal left inverted right x axis y axis)

ncerrone · 2022-12-15 14:48:18

Update:
Now in my display configuration, the other monitor shows up (which wasn't happening before). I can enable it and set it as my primary monitor, but once I apply changes I get something similar to what I was greeted with this morning. One monitor loses signal and the other goes black with only my mouse visible.

seth · 2022-12-15 14:50:52

Please use code tags, https://bbs.archlinux.org/help.php#bbcode (welcome to the forum )

xrandr --output DP-4 --auto --right-of HDMI-0

This is probably a kscreen problem, look around in ~/.local/share/kscreen/ and in doubt delete all files there.

Edit

once I apply changes I get something similar to what I was greeted with this morning. One monitor loses signal and the other goes black with only my mouse visible.

"goes black with only my mouse visible" means that either the session crashed to the compositor mis-reacts to the randr event (for whatever reason)
To check the latter theory, SHIFT+alt+F12 toggles the compositor, see whether there's any response to that.
Though the other output deactivating sounds like there's another issue w/ this.
Still try using xrandr to configure the output.
You can also do so from a different VT (Ctrl+Alt+F2,F3,F4…) but will first have to

export DISPLAY=:0

Last edited by seth (2022-12-15 14:55:18)

ncerrone · 2022-12-15 17:29:34

seth wrote:

Please use code tags, https://bbs.archlinux.org/help.php#bbcode (welcome to the forum )
xrandr --output DP-4 --auto --right-of HDMI-0
This is probably a kscreen problem, look around in ~/.local/share/kscreen/ and in doubt delete all files there.
Edit
once I apply changes I get something similar to what I was greeted with this morning. One monitor loses signal and the other goes black with only my mouse visible.
"goes black with only my mouse visible" means that either the session crashed to the compositor mis-reacts to the randr event (for whatever reason)
To check the latter theory, SHIFT+alt+F12 toggles the compositor, see whether there's any response to that.
Though the other output deactivating sounds like there's another issue w/ this.
Still try using xrandr to configure the output.
You can also do so from a different VT (Ctrl+Alt+F2,F3,F4…) but will first have to
export DISPLAY=:0

OK, sorry for the delay! After running

xrandr --output DP-4 --auto --right-of HDMI-0

I see some response from my other display. Something triggers the no-signal text to appear again and the monitor turns on for a brief moment, but still no image.

When I enable the disabled display and my screen turns black, if I use SHIFT+alt+F12 I get an image from the display that was already working. The other display still remains black.

When I go to the virtual terminal with ctrl+alt+f2 and do

export DISPLAY=:0
xrandr --output DP-4 --auto --right-of HDMI-0

I get

X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  7 (RRSetScreenSize)
  Serial number of failed request:  44
  Current serial number in output stream:  45

Thanks for all the help btw

psionman · 2024-05-07 11:41:58

@seth's suggestion worked for me

> This is probably a kscreen problem, look around in ~/.local/share/kscreen/ and in doubt delete all files there.

Last edited by psionman (2024-05-07 11:43:05)

V1del · 2024-05-07 11:59:17

You are responding to a two year old solved thread, please pay attention to the dates before bumping.

Closing this old thread.

Arch Linux

#1 2022-12-15 12:07:47

[SOLVED] Only One Monitor Displays the Desktop Environment at a Time

#2 2022-12-15 14:37:37

Re: [SOLVED] Only One Monitor Displays the Desktop Environment at a Time

#3 2022-12-15 14:41:17

Re: [SOLVED] Only One Monitor Displays the Desktop Environment at a Time

#4 2022-12-15 14:48:18

Re: [SOLVED] Only One Monitor Displays the Desktop Environment at a Time

#5 2022-12-15 14:50:52

Re: [SOLVED] Only One Monitor Displays the Desktop Environment at a Time

#6 2022-12-15 17:29:34

Re: [SOLVED] Only One Monitor Displays the Desktop Environment at a Time

#7 2024-05-07 11:41:58

Re: [SOLVED] Only One Monitor Displays the Desktop Environment at a Time

#8 2024-05-07 11:59:17

Re: [SOLVED] Only One Monitor Displays the Desktop Environment at a Time

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