Can't figure how to write Xorg configuration for second screen

Basically I've got the main monitor going as it should, but I can't configure the secondary monitor.
The monitors:
Main monitor: 2560x1440, 144Hz, normal rotation, placed to the left.
Secondary monitor: 1920x1080, 60Hz, rotated clockwise, placed to the right.
An important detail is that the main screen has a broken EDID (/var/log/Xorg.0.log has errors and warnings about it). Without the lines currently present in my Xorg configuration, X won't start.
This is important to note because I can't rely on Xorg figuring out the monitors on its own (as I've done on most setups the last decade or so).
Here's the current version of /etc/X11/xorg.conf.d/10-monitor.conf:
Section "Monitor"
Identifier "DP-0"
Option "Primary" "true"
Modeline "2560x1440@144" 3322.15 2560 2592 15216 15248 1440 1460 1493 1513
EndSection
Section "Monitor"
Identifier "HDMI-0"
Option "Rotate" "Left"
Option "RightOf" "DP-0"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
Option "NoLogo"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "DP-0"
DefaultDepth 24
SubSection "Display"
Modes "2560x1440_144"
EndSubSection
EndSection
The second "Monitor" section seems to be non-working at the moment, that monitor stays black.
I've tried adding plenty of different things to that, but i can't ever get the secondary monitor going (the main one works).
The following command gets it working, but it's not in the configuration file and I don't how to translate the command:
xrandr --output HDMI-0 --mode 1920x1080 --right-of DP-0 --rotate left
Here's the output from xrandr before running the above command:
Screen 0: minimum 8 x 8, current 2560 x 1440, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected (normal left inverted right x axis y axis)
1920x1080 59.93 + 60.00 59.94 50.00 60.05 60.00 50.04
1680x1050 59.95
1280x1024 60.02
1280x960 60.00
1280x720 60.00 59.94 50.00
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 59.94
640x480 59.94 59.93
DP-0 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 598mm x 336mm
2560x1440 59.95 + 144.00* 120.00 99.95 84.98 23.97
DP-1 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)
Unknown-0 disconnected (normal left inverted right x axis y axis)
Here's the output from xrandr after running the command above:
Screen 0: minimum 8 x 8, current 3640 x 1920, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected 1080x1920+2560+0 left (normal left inverted right x axis y axis) 530mm x 300mm
1920x1080 59.93*+ 60.00 59.94 50.00 60.05 60.00 50.04
1680x1050 59.95
1280x1024 60.02
1280x960 60.00
1280x720 60.00 59.94 50.00
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 59.94
640x480 59.94 59.93
DP-0 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 598mm x 336mm
2560x1440 59.95 + 144.00* 120.00 99.95 84.98 23.97
DP-1 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)
Unknown-0 disconnected (normal left inverted right x axis y axis)
This suggests to me that in my Xorg configuration I should configure the "Screen" section differently, since in the second "xrandr" output, the first line (that starts with "Screen0") contains the resolution "3640 x 1920".
However, when I tried to replace the line "Modes "2560x1440_144"" with "Modes "3640x1920"", X didn't start.
Any ideas on how to solve this?
EDIT: Added more information.
Last edited by linduxed (2015-04-05 08:27:11)

Your PreferredMode line is wrong, it should be 2560x1440@144, not 2560x1440_144. You see, the numbers are meaningless, what you provide with Modeline is a name. And then everywhere else, you refer to that name. To demonstrate, if the Nvidia driver supports PreferredMode, this will work
Section "Monitor"
Identifier "DP-0"
Option "Primary" "true"
Modeline "ugabuga" 3322.15 2560 2592 15216 15248 1440 1460 1493 1513
Option "PreferredMode" "ugabuga"
EndSection
If this doesn't work, we'll try Nvidia's MetaModes option instead of PreferredMode.
About the Device section, you don't need it because selecting the nvidia driver is taken care of by /usr/share/X11/xorg.conf.d/nvidia-drm-outputclass.conf
Last edited by Gusar (2015-04-05 11:31:02)

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