no signal in dual monitors after logging in

[brad12s]

I am running Kubuntu 14.04 with a Nvidia GeForce GT 610 and dual monitors both DVI. I've been running this rig for almost a year with no problems until recently.
I am having trouble running both monitors now.
Both monitors have a signal and work at the kubuntu login (lightdm?) but as soon as I login into KDE they no longer receive any signal.
If i run either monitor one at a time it works fine but both loose all signal after logging in. Funny when they both work before logging in.

Switching to a vterm i see: /usr/bin/X running and lightdm running
After logging in and have no signal, a ctrl-alt-backspace to kill X will bring up the login manager again and both monitors work again.

All help would be appreciated. Here is what I've tried so far:
I've tried reinstalling the nvidia drivers: > sudo apt-get purge nvidia*; sudo apt-get install nvidia-current; sudo apt-get install nvidia-settings; sudo dpkg-reconfigure nvidia-current; sudo nvidia-xconfig; sudo reboot.
I've tried both the nvidia-xconfig xorg.conf and no xorg.conf.


help?

[oshunluvr]

output from xrandr when logged into a single monitor?

[brad12s]

output from xrandr when logged into a single monitor?

$ xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, 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)
DVI-I-2 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 598mm x 336mm
1920x1080 60.0*+
1680x1050 60.0
1440x900 59.9
1280x1024 60.0
1280x800 59.8
1280x720 60.0
1152x864 75.0
1024x768 70.1 60.0
800x600 60.3 56.2
640x480 59.9
DVI-I-3 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)

[oshunluvr]

Looks like your second monitor isn't being detected at all. Did I misunderstand your post? When you said "single" monitor, you meant unplugging one of them?

Plug them both in, at the log in screen, hit CRTL-F1 and log into the text console, then do xrandr again.

[brad12s]

I must have misunderstood the direction. The above xrandr output is from a single monitor plugged-in and logged-in with signal in the single monitor.
xrandr does not find the displays with both monitors plugged-in with signals at the login screen:

xrandr
Cant open display

xrandr -d :0
Invalid MIT-MAGIC-COOKIE-1 key Can't open display :0

I was able to get output from xrandr with both monitors plugged-in and logged-in with no signal on either:

xrandr -d :0

Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 16384 x 16384
DVI-I-0 disconnected primary (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
DVI-I-2 connected (normal left inverted right x axis y axis)
1920x1080 60.0 +
1680x1050 60.0
1440x900 59.9
1280x1024 60.0
1280x800 59.8
1280x720 60.0
1152x864 75.0
1024x768 70.1 60.0
800x600 60.3 56.2
640x480 59.9
DVI-I-3 connected (normal left inverted right x axis y axis)
1920x1080 60.0 +
1680x1050 60.0
1440x900 59.9
1280x1024 60.0
1280x800 59.8
1280x720 60.0
1152x864 75.0
1024x768 70.1 60.0
800x600 60.3 56.2
640x480 59.9
HDMI-0 disconnected (normal left inverted right x axis y axis)

thanks for the help!

[oshunluvr]

Re-reading your OP my first thought is you have a configuration issue in your user account. Try creating a new user and then logging as that user. Assuming that works, you'll either need to dig through your home and figure out which config is causing the problem or nuke your ~/.kde folder (and lose all your settings).

Another option is to use an xorg.conf file. Something like:

Section "ServerLayout"    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Option         "Xinerama" "0"
EndSection


Section "Files"
EndSection


Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       30.0 - 81.0
    VertRefresh     56.0 - 75.0
    Option         "DPMS"
EndSection


Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GT 610"
EndSection


Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Twinview" "1"
    Option         "TwinviewXineramaInfoOrder" "DFP-0"
    Option         "metamodes" "DFP-0: 1920x1080 +1920+0, DFP-1: 1920x1080 +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection