More info. So normally I had the minimal xorg configuration, and would
just use twinview when plugging in an external monitor.
I switched it to this:
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 280.13 (buildd@yellow) Fri Aug 5 12:31:28 UTC
2011
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "0"
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"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Apple"
HorizSync 30.0 - 75.0
VertRefresh 60.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 9600M GT"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "TwinView" "1"
Option "metamodes" "DFP-0: nvidia-auto-select +0+0, DFP-1:
nvidia-auto-select +1440+0"
SubSection "Display"
Depth 24
EndSubSection
EndSection
And on first boot/login, the monitor works fine. However, If I open up
nvidia-settings and disable the external monitor, nvidia settings complains but
no more windows are placed on it (the mouse can still traverse into it).
Upon re-adding the external monitor to TwinView, however, this effect
happens again.. black area where mouse can traverse but no windows.
Logging out / back in "fixes" this, but that means loss of my session.
So it seems that whatever method nvidia settings uses to re-configure
displays isn't being honored by Unity.
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https://bugs.launchpad.net/bugs/813343
Title:
nvidia drivers, second monitor covered by black
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