I believe in the control center it will tell you the model number of the display it thinks it is connected to.
Many of the 22' displays are not capable of 1920X1080 but some are.

Also some where on the monitor there will be a name plate that will have the model number on it.
Look up the model number and check if it can do 1920X1080.

If it can support 1920X1080 then likely your problem is the drivers are old and you need to get the lastest ones.