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[EN] Setting up xorg for three monitors
finotti:
I've been able to set up my three monitors in plasma, but I wanted to have it set in xorg.conf, if possible:
--- Code: ---$ xrandr
Screen 0: minimum 320 x 200, current 5560 x 1920, maximum 16384 x 16384
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-3 connected 1920x1200+0+360 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 59.95*+
1920x1080 60.00 50.00 50.00 59.94
1600x1200 60.00
1680x1050 59.95
1280x1024 75.02 72.05 60.02
1440x900 74.98 59.89
1280x720 60.00 50.00 59.94
1024x768 75.03 70.07 60.00
800x600 72.19 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 72.81 66.03 60.00 59.94
720x400 70.08
HDMI-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
HDMI-4 disconnected (normal left inverted right x axis y axis)
DisplayPort-1-4 connected primary 2560x1440+1920+240 (normal left inverted right x axis y axis) 597mm x 336mm
2560x1440 59.95*+
1920x1200 59.95
2048x1080 60.00 24.00
1920x1080 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98
1600x1200 60.00
1680x1050 59.95
1280x1024 75.02 60.02
1440x900 59.95
1280x800 59.95
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
DisplayPort-1-5 connected 1080x1920+4480+0 right (normal left inverted right x axis y axis) 527mm x 296mm
1920x1080 60.00*+
1680x1050 60.00
1600x900 60.00
1280x1024 75.02 60.02
1440x900 60.00
1280x800 60.00
1152x864 75.00
1280x720 60.00
1024x768 75.03 60.00
800x600 75.00 60.32
640x480 75.00 59.94
720x400 70.08
1920x1080 (0x4c) 148.500MHz +HSync +VSync
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.50KHz
v: height 1080 start 1084 end 1089 total 1125 clock 60.00Hz
1920x1080 (0x4e) 148.500MHz +HSync +VSync
h: width 1920 start 2448 end 2492 total 2640 skew 0 clock 56.25KHz
v: height 1080 start 1084 end 1089 total 1125 clock 50.00Hz
1920x1080 (0x4f) 148.352MHz +HSync +VSync
h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.43KHz
v: height 1080 start 1084 end 1089 total 1125 clock 59.94Hz
1600x1200 (0x50) 162.000MHz +HSync +VSync
h: width 1600 start 1664 end 1856 total 2160 skew 0 clock 75.00KHz
v: height 1200 start 1201 end 1204 total 1250 clock 60.00Hz
1280x1024 (0x52) 135.000MHz +HSync +VSync
h: width 1280 start 1296 end 1440 total 1688 skew 0 clock 79.98KHz
v: height 1024 start 1025 end 1028 total 1066 clock 75.02Hz
1280x1024 (0x54) 108.000MHz +HSync +VSync
h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 63.98KHz
v: height 1024 start 1025 end 1028 total 1066 clock 60.02Hz
1280x720 (0x57) 74.250MHz +HSync +VSync
h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 45.00KHz
v: height 720 start 725 end 730 total 750 clock 60.00Hz
1280x720 (0x58) 74.250MHz +HSync +VSync
h: width 1280 start 1720 end 1760 total 1980 skew 0 clock 37.50KHz
v: height 720 start 725 end 730 total 750 clock 50.00Hz
1280x720 (0x59) 74.176MHz +HSync +VSync
h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 44.96KHz
v: height 720 start 725 end 730 total 750 clock 59.94Hz
1024x768 (0x5a) 78.750MHz +HSync +VSync
h: width 1024 start 1040 end 1136 total 1312 skew 0 clock 60.02KHz
v: height 768 start 769 end 772 total 800 clock 75.03Hz
1024x768 (0x5c) 65.000MHz -HSync -VSync
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz
v: height 768 start 771 end 777 total 806 clock 60.00Hz
800x600 (0x5e) 49.500MHz +HSync +VSync
h: width 800 start 816 end 896 total 1056 skew 0 clock 46.88KHz
v: height 600 start 601 end 604 total 625 clock 75.00Hz
800x600 (0x5f) 40.000MHz +HSync +VSync
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz
v: height 600 start 601 end 605 total 628 clock 60.32Hz
720x576 (0x60) 27.000MHz -HSync -VSync
h: width 720 start 732 end 796 total 864 skew 0 clock 31.25KHz
v: height 576 start 581 end 586 total 625 clock 50.00Hz
720x480 (0x61) 27.027MHz -HSync -VSync
h: width 720 start 736 end 798 total 858 skew 0 clock 31.50KHz
v: height 480 start 489 end 495 total 525 clock 60.00Hz
720x480 (0x62) 27.000MHz -HSync -VSync
h: width 720 start 736 end 798 total 858 skew 0 clock 31.47KHz
v: height 480 start 489 end 495 total 525 clock 59.94Hz
640x480 (0x63) 31.500MHz -HSync -VSync
h: width 640 start 656 end 720 total 840 skew 0 clock 37.50KHz
v: height 480 start 481 end 484 total 500 clock 75.00Hz
640x480 (0x66) 25.200MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.50KHz
v: height 480 start 490 end 492 total 525 clock 60.00Hz
640x480 (0x67) 25.175MHz -HSync -VSync
h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz
v: height 480 start 490 end 492 total 525 clock 59.94Hz
720x400 (0x68) 28.320MHz -HSync +VSync
h: width 720 start 738 end 846 total 900 skew 0 clock 31.47KHz
v: height 400 start 412 end 414 total 449 clock 70.08Hz
--- End code ---
--- Code: ---$ inxi -G
Graphics:
Device-1: Intel Raptor Lake-S GT1 [UHD Graphics 770] driver: i915 v: kernel
Device-2: AMD Navi 24 [Radeon RX 6300] driver: amdgpu v: kernel
Device-3: Logitech Webcam C270 driver: snd-usb-audio,uvcvideo type: USB
Display: x11 server: X.Org v: 1.21.1.8 with: Xwayland v: 23.2.0 driver: X:
loaded: amdgpu,modesetting unloaded: fbdev,radeon,vesa dri: iris
gpu: amdgpu,i915 resolution: 1: 1920x1200~60Hz 2: 2560x1440~60Hz
3: 1080x1920~60Hz
API: OpenGL v: 4.6 Mesa 23.1.6-1 renderer: Mesa Intel Graphics (RPL-S)
--- End code ---
I had tried the following 10-monitor.conf in /etc/X11/xorg.conf.d to copy that set up:
--- Code: ---Section "Monitor"
Identifier "DP-1-5"
Option "Primary" "true"
Option "Position" "1920 240"
EndSection
Section "Monitor"
Identifier "DP-1-6"
Option "Position" "4480 0"
Option "Rotate" "right"
EndSection
Section "Monitor"
Identifier "DP-3"
Option "Position" "0 360"
EndSection
--- End code ---
I noticed that the identifiers from xrandr changed. (Instead of DP-1-5, it now shows DisplayPort-1-5, for instance. I assume that's why it did not work...)
How do I find the proper identifier for each monitor?
ro_sid:
Hello! It has been quite some time, that I was manually setting up xorg X11 configurations, but I am pretty sure, the "Identifier" has only a name-giving meaning. You are totally free in your choice. To order "monitors" to your liking, you need to have a devices, screen and monitor section and select the connector/connection via an option in the device(?) section.
Have a look at "How do I configure xorg.conf for two X screens on one Nvidia card?"(https://askubuntu.com/questions/1376935/how-do-i-configure-xorg-conf-for-two-x-screens-on-one-nvidia-card) to get an idea, how to do it.
You can, of course, divide the sections into different files in the xorg.d directory, instead of a putting them into a single file.
finotti:
--- Quote from: ro_sid on 2023/09/12, 00:20:38 ---To order "monitors" to your liking, you need to have a devices, screen and monitor section and select the connector/connection via an option in the device(?) section.
--- End quote ---
Thanks for the reply! I checked your suggestions and attempted to fix the issue. Unfortunately, I could not get it to really work. SDDM just shows one monitor.
I have two cards, and I used their addresses to add Devices:
--- Code: ---$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Raptor Lake-S GT1 [UHD Graphics 770] (rev 04)
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 24 [Radeon RX 6300]
--- End code ---
(You can see xrandr and inxi -G in the previous post.)
Here is what I made:
--- Code: ---# cat /etc/X11/xorg.conf.d/10-monitor.conf
Section "Monitor"
Identifier "Dell27"
Option "Primary" "true"
Option "Position" "1920 240"
EndSection
Section "Monitor"
Identifier "Dell24"
Option "Position" "4480 0"
Option "Rotate" "right"
EndSection
Section "Monitor"
Identifier "Lenovo"
Option "Position" "0 360"
EndSection
Section "Screen"
Identifier "ScreenL"
Device "intel"
Monitor "Lenovo"
EndSection
Section "Screen"
Identifier "ScreenM"
Device "amd"
Monitor "Dell27"
EndSection
Section "Screen"
Identifier "ScreenR"
Device "amd"
Monitor "Dell24"
EndSection
--- End code ---
--- Code: ---# cat /etc/X11/xorg.conf.d/20-amdgpu.conf
#Section "OutputClass"
# Identifier "AMD"
# MatchDriver "amdgpu"
# Driver "amdgpu"
#EndSection
Section "Device"
Identifier "intel"
#Driver "intel"
BusID "PCI:00:02:0"
#Screen 0
EndSection
Section "Device"
Identifier "amd"
Driver "amdgpu"
BusID "PCI:03:00:0"
#Screen 1
EndSection
--- End code ---
I get no errors in /var/log/Xorg.0.log and SDDM start with no problems, but only one monitor (the one connected to the intel card) starts.
If I switch to a TTY, the same monitor switches, but the other two display what was there before in the X session.
It is not a huge deal, but it would be nice if it could work properly...
eriefisher:
SDDM starts the xserver so your configuration is likely being ignored. You need to tell SDDM what to do. Not sure if this is still relavent but it might get you started. I don't know much about SDDM as I really don't like it and replace it with LightDM,
https://blog.victormendonca.com/2018/06/29/how-to-fix-sddm-on-multiple-screens/
finotti:
--- Quote from: eriefisher on 2023/09/15, 01:29:04 ---SDDM starts the xserver so your configuration is likely being ignored. You need to tell SDDM what to do. Not sure if this is still relavent but it might get you started. I don't know much about SDDM as I really don't like it and replace it with LightDM,
https://blog.victormendonca.com/2018/06/29/how-to-fix-sddm-on-multiple-screens/
--- End quote ---
Thanks for that! This did fix SDDM, where now the login screen appears in all monitors.
The thing that still remains (and bothers me) is that when changing to a TTY, only my left screen goes to it, while the middle and right screen still show the plasma desktop. This makes me have to type looking to the left monitor instead of the center one...
With my previous computer (and two monitors), when going to a TTY, all monitors would display the same content (from the terminal). That was much better, and I can't seem to make it work.
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