Unknown Display

[Bob]

I have searched the internet and the Ubuntu bugs for this problem without
success.

I updated a system from 21.10 to 22.04 and noticed that when the screen is
blanked by no keyboard or mouse activity that the backlight in the monitor is
still on.  The settings -> Displays has "Unknown Display" which I assume means
the system does not know what commands to send to the monitor to shut it off. 
I booted a live DVD of 21.10 and the settings has the display as 'AOC 22" '
which is correct and the screen blanking works correctly.  So it seems that the
definition for the AOC displays have been removed from 22.04.  I think I can
fix this by coping the AOC definitions from 21.10 to 22.04.

What is the file name of the file that contain the display definitions?

-- 
Robert Blair


Journalists and politicans are mouthpieces in a cottage industry who monitor and attack anything that may run contrary to their mission  -- Joe Bastardi 2020