Fix Ubuntu Extended Display resolution problem

It will give the following output in the terminal:

It outputs current screen resolution as well as all available solutions. ALL you need here is the display device name, in my case, it’s DP-1.

2. Run command to calculate mode lines by given resolution:

It will give the following output:

Replace 1600 900 (1600X900 in my case) in the command to your desired screen resolution.

3. Copy the Modeline (words with a red underline, see the previous picture), and run command to add new mode:

4. Now add the newly created mode to get your display device:

Finally, Apply the new resolution in the Display settings:

Note: To make Ubuntu remember the newly created screen resolution at next start, you have to edit the .profile via command:

add this two line in the bottom of the file:

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