Cannot Change Screen Resolution for Ubuntu 12.04 Desktop
Today my Ubuntu decided to "forget" it got 2 monitors connected. Once I activated the 2nd monitor again, I could only choose a max screen resolution of 1024×768.
After some searching I found the solution on Ask Ubuntu 
Open Terminal and type:
$ xrandr
it will show you the available screen resolutions for the connected monitors.
$ xrandr
Screen 0: minimum 320 x 200, current 2944 x 1080, maximum 8192 x 8192
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1920×1080+1024+0 (normal left inverted right x axis y axis) 509mm x 286mm
1920×1080 60.0*+
1280×1024 60.0
1440×900 59.9
1280×800 59.8
1152×864 75.0
1024×768 70.1 60.0
800×600 60.3 56.2
640×480 66.7 60.0
720×400 70.1
VGA-0 connected 1024×768+0+312 (normal left inverted right x axis y axis) 0mm x 0mm
1024×768 60.0*
800×600 60.3 56.2
848×480 60.0
640×480 59.9
Screen 0: minimum 320 x 200, current 2944 x 1080, maximum 8192 x 8192
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1920×1080+1024+0 (normal left inverted right x axis y axis) 509mm x 286mm
1920×1080 60.0*+
1280×1024 60.0
1440×900 59.9
1280×800 59.8
1152×864 75.0
1024×768 70.1 60.0
800×600 60.3 56.2
640×480 66.7 60.0
720×400 70.1
VGA-0 connected 1024×768+0+312 (normal left inverted right x axis y axis) 0mm x 0mm
1024×768 60.0*
800×600 60.3 56.2
848×480 60.0
640×480 59.9
VGA-1 is the monitor that has a max screen resolution of 1024×769.
So, next command in terminal:
$ xrandr --addmode VGA-0 1920×1080
And check:
$ xrandr
$ xrandr
Screen 0: minimum 320 x 200, current 2944 x 1080, maximum 8192 x 8192
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1920×1080+1024+0 (normal left inverted right x axis y axis) 509mm x 286mm
1920×1080 60.0*+
1280×1024 60.0
1440×900 59.9
1280×800 59.8
1152×864 75.0
1024×768 70.1 60.0
800×600 60.3 56.2
640×480 66.7 60.0
720×400 70.1
VGA-0 connected 1024×768+0+312 (normal left inverted right x axis y axis) 0mm x 0mm
1024×768 60.0*
800×600 60.3 56.2
848×480 60.0
640×480 59.9
1920×1080 60.0
Screen 0: minimum 320 x 200, current 2944 x 1080, maximum 8192 x 8192
HDMI-0 disconnected (normal left inverted right x axis y axis)
DVI-0 connected 1920×1080+1024+0 (normal left inverted right x axis y axis) 509mm x 286mm
1920×1080 60.0*+
1280×1024 60.0
1440×900 59.9
1280×800 59.8
1152×864 75.0
1024×768 70.1 60.0
800×600 60.3 56.2
640×480 66.7 60.0
720×400 70.1
VGA-0 connected 1024×768+0+312 (normal left inverted right x axis y axis) 0mm x 0mm
1024×768 60.0*
800×600 60.3 56.2
848×480 60.0
640×480 59.9
1920×1080 60.0
Last step: Open Display settings and change the resolution for the monitor in question.
Done, enjoy 
Reference:
Screen resolution stuck at 1024×768
http://askubuntu.com/questions/37411/screen-resolution-stuck-at-1024×768
3938
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