So it seems this is a well known issue:
has anybody looked into this recently?
f17 is also affected... this is bad news
---------- Post added at 04:47 PM ---------- Previous post was at 08:44 AM ----------
I seem to have found a fix to this... If I open the monitor configuration interface and choose what I want, the external monitor goes black, as described BUT if I suspend the system and wake it up, the configuration is what I chose.
Ugly, but it works.
I just wanted to let you know.
PS: Installing older kernels did not help, though