10.9.3 breaks 5770 Display Port

[mysticmerlin]

10.9.3 breaks 5770 Display Port.

Was working fine under 10.9.2.
Any ideas welcome. I could really use that third screen . The 2 dvi ports are working fine
Apparently this is not the only graphics card concerned by this problem


Cheers

 

[mysticmerlin]

For those interested I was able to roll back just the 10.9.2 versions of AMD5000Controller.kext / AMDFramebuffer.kext/ AMD Support.kext and I recovered the three ports