Ubuntu: Ubuntu 16.04 xserver does not identify attached monitor only default display


I have a AMD radeon onboard HD 7660 D. but in displays or xrandr I do not see the attached monitor any more.

After a failed AMD grafic driver installation I had to reset xserver und reinstall it (looping login)

How to resolve this problem?

maybe any configuration files still exists which need to be deleted.

Any way to reset this?

Reconfigure xserver did not solve it.

Thanks for your hints.


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