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CCC is very old. The new drivers use Radeon Settings. The latest Driver for your HD78xx is from 03/26/2018 (Windows 10 x64) here: Desktop .
In Radeon Settings you should be able to customize the Resolution to your monitor. But if by some chance it doesn't, then download the program mentioned below:
There is a small program called CRU (Custom Resolution Utility) where you can change your Monitor EDID to accept a Custom Resolution.
If you have Windows 10 installed, Under SETTINGS - DISPLAY does it show the 1920 x 1080 under Resolutions?
Thanks for the reply.
Radeon Setting does not allow to change the monitor settings. At least I do.
I'm using Windows 7.
I'll try installing CRU later when I'm near that computer.
CRU solved my problem!