Been stuggling with this over a week.
Temporarily resorted to using back VGA as the user is complaining its taking too long.
DVI works fine.
Scenariio 1 Connection:
AMD Radeon R9-280 Mini-DP ---- mDP-DP----> DP (Monitor)
Scenario 2 Connection:
Late 2008 MacBook Mini DP---- mDP (Multiple output (DP/HDMI/DVI-D) --- using DP ---> DP (monitor)
Scenario 3 Connection:
AMD Radeon R9-280 Mini-DP---- mDP (Multiple output (DP/HDMI/DVI-D) --- using DP(bundled) ---> DP (monitor)
For all I'm getting no signal/monitor goes to sleep.
Have tried the switching off the DP1.2 compliance but i'm still getting the same issue.
Appreciate some help.