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I just installed Xubuntu 13.04 with Windows 8 dual boot on my Dell XPS 13 (2013) Ultrabook. All is good, except when I connect my ViewSonic HDMI 1080p Full HD External Monitor, it appears as Display DP1 in Xubuntu with a maximum screen resolution of 1024 x 768. The monitor is:

ViewSonic VX2739WM Model Number: VS12843 Optimum Resolution: 1920x1080 WUXGA

It is discontinued.

I am connecting to a new Dell XPS 13 (2013) ultrabook using the minidisplay port adapter:

I have also tried to used xrandr to fix the problem without much success. See below:

$ cvt 1920 1080
#Modeline "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync

$ xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync

$ xrandr --addmode DP1 1920x1080_60.00

$ xrandr --output DP1 --mode 1920x1080_60.00

The last command (STEP 4) below completely messes up my laptop display and my external display switches off completely.

I have a thread about this here, but all is quiet on the western front (hence why I am posting here):

Any help would be greatly appreciated!

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For STEP 1 you should try cvt -r 1920 1080
The -r switch will yield slightly different results, and for the next steps use that output.

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