I have a mid 2012 MACBOOK Pro 15 inch with KOGAN 2560x1440 external monitor connected to display port on mac. Things worked fine until my first install of Mavericks - which started to create Mosaic patterns on my screen. Updating to Mavericks 10.9.2 caused the system to crash frequently after hibernation and at this point I lost my Hi_res display output. This monitor uses a separate input for this resolutionand a separate input for the 1920x1080p output - which still works fine (but now I have the same lo-resolution 1080p res i was trying to avoid by buying this monitor).
I have had my mac serviced (they replaced the logic board) which has fixed the mosaic screen distortion and the crashing on hibernation) -
I have ruled out a problem with my Mac outputting at the higher resolution (it works fine on Apple's own branded Hi-res monitor), I have ruled out problems with the monitor as it still works at the hi resolution (2560x1440) on my Windows 8 PC and it still works fine on non-Mavericks macs.
I have tried all the tricks in the forums - where i am able to.(holding alt, booting in safe mode, different cables, third party utilities - etc - I don't want to go back to Mountain Lion becuase that would be a pain in the *** to do)
I have called Kogan - who have listed it as a problem Apple needs to fix.
What I would like to know is:
When will Apple fix this problem?
as it is clearly an Intentional or Unintentional bug in the OS that has occurred (for me at least) between Mavericks 10.9.1 and 10.9.2 and does not affect Apple branded external hi-res monitors.
For those of you out there who have gone to the trouble and investment on a Hi-res external monitor you did it for a reason - It makes you more effective/efficient. To have that 20%+ of screen pace removed is like reducing your dexteriry by removing a finger.....