I connected my Ubuntu laptop to an external 24 inch monitor.  I then tried to set the resolution to a level appropriate for a 24 inch monitor: 1920×1200.  However when I looked in the settings the highest resolution was quite low.  I had to add additional resolution levels manually. 

Research Links

I followed the procedures detailed in the linked articles.  When I tried 1920×1200 resolution with 60Hz frequency it did not show up in the configuration gui list.  It must have been illegal.  When I changed to 70Hz it did work.   Note that it is important to generate the mode line individually for each resolution/frequency combination.  I did a bonehead thing and reused the line for the 1280×1024 for the 1920×1200 mode and of course that did not work. 

The changes made are not permanent and upon reboot will be lost.

Categories: ComputingLinux

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