Can you suggest a good resource for learning how to properly edit the xorg.conf file?
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I still think xrandr should work. something like this :
xrandr --output LVDS-0 --auto --output DP-1 --auto --right-of LVDS-0 --output DP-2 --auto --right-of DP-1
If this still fails, I'd start with the nvidia-xconfig or use nvidia settings to generate an xorg.conf first. Then re-start X and make sure it works as-is - even if it's not correctly setup yet, you want to be able to get back to your desktop safely.
Once you have a working xorg.conf, then make a backup copy of it so you can restore it and re-gain your desktop if you mess up during editing. You do not need to do a full reboot to reload X, just restart the display manager:
sudo service lightdm restart
If you kill your desktop and end up in the text terminal, just navigate to /etc/X11 and restore the last working copy of xorg.conf. Something like this series of commands:
cd /etc/X11
sudo mv xorg.conf xorg.conf.1bad
sudo cp xorg.conf.1good xorg.conf
sudo service lightdm restart
Once you have one that works and is backed up, then add a monitor and screen section for each one and then set your server section to use all three. Best way to get help is to web search on your setup - three monitor xorg.conf - or something like that.
Something else you should be doing is reading your /var/log/Xorg.0.log to see what's going on. It might tell us why the third monitor isn't coming on.Comment
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using nvidia driver version 304.116Comment
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Before i ran nvidia-xconfig I did not have an xorg.conf file. Even with the new one in place nothing changes.Originally posted by oshunluvr View PostComment
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I found this little tidbit:
nvidia-xconfig --base-mosaic --metamodes="GPU-0.LVDS-0: nvidia-auto-select +0+0, GPU-0.DP-1: nvidia-auto-select +1920+0, GPU-0.DP-2: nvidia-auto-select +3840+0"
I don't know if base-mosaic will work on a single card.
this might be worth trying too:
nvidia-xconfig --twinview --metamodes="LVDS-0: nvidia-auto-select +0+0, DP-1: nvidia-auto-select +1920+0, DP-2: nvidia-auto-select +3840+0"Comment
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Yeah, it's not going to change all by itself. Attach a copy of what you got.Originally posted by jrob09BHS View PostComment
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Couldn't get the file to upload but here is the contentsOriginally posted by oshunluvr View Post
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 304.116 (buildmeister@swio-display-x86-rhel47-01) Mon Oct 28 21:46:08 PDT 2013
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "Files"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 28.0 - 33.0
VertRefresh 43.0 - 72.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "BaseMosaic" "True"
Option "MetaModes" "GPU-0.LVDS-0: nvidia-auto-select +0+0, GPU-0.DP-1: nvidia-auto-select +1920+0, GPU-0.DP-2: nvidia-auto-select +3840+0"
SubSection "Display"
Depth 24
EndSubSection
EndSectionComment
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As far as I can see that should work. Maybe it doesn't like the third monitor because the default resolution is different. Try this:
xrandr --output LVDS-0 --auto --output DP-1 --auto --right-of LVDS-0 --output DP-2 --1920x1080--right-of DP-1Comment
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It doesn't like the --1920x1080 option.Originally posted by oshunluvr View Post
"unrecognized option --1920x1080"
I could not upload the logs to the forums so i put then on my server
Here is Xorg.0.log http://jrobcomputers.com/downloads/Xorg.0.log
and an older log file http://jrobcomputers.com/downloads/Xorg.0.log.oldComment
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Sorry that was my fault:
xrandr --output LVDS-0 --auto --output DP-1 --auto --right-of LVDS-0 --output DP-2 --mode 1920x1080 --right-of DP-1
would have been the right command to try.
Even a quick glance at your log file reveals that the EDID for your Dell U2410 isn't being read correctly. You'll have to define the monitor manually in xorg.conf.
Some thing like this:
Section "Monitor"
Identifier "DP-2"
VendorName "DELL"
ModelName "U2410"
HorizSync 30 - 81
VertRefresh 56 - 76
Option "UseEDID" "false"
ModeLine "1920x1200" 193.16 1920 2048 2256 2592 1200 1201 1204 1242 +HSync -VSync
EndSection
Obviously, use your correct freqs. and build a new modeline(s) using the cvt command.
The other thing that your log shows is that the BaseMosiac function only works with multiple video cards, so it's being ignored. I think you might need three monitor and screen sections and to make your server section look like:
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
Screen 1 "Screen1" LeftOf "Screen0"
Screen 2 "Screen2" LeftOf "Screen1"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSectionComment
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that xrandr command renders this:Originally posted by oshunluvr View Post
xrandr: cannot find crtc for output LVDS-0Comment
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That may be occurring because it's already active.
Try it this way:
xrandr --output DP-2 --mode 1920x1080 --right-of DP-1
I'm just about out of ideas.Comment
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that just changes the resolution of my 24" to 1920x1080
. BUT i am getting different results now with the xorg.conf. This is what i have so far http://www.jrobcomputers.com/downloa...base.jrobinson
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