Philips 4065UC

Question

Philips 4065UC

I recently bought a Philips 4065UC 4K Display with DisplayPort & MiniDisplayPort (both supporting 60Hz).
So I made a few tests using a Macbook Pro Mid 2014 Retina and a Macbook Pro Mid 2013 Retina, both with thunderbolt2 ports. The Thunderbolt ports works well with other monitors and even with TargetDisplayMode on iMacs.
The issue:
The gigantic 40" Philips monitor does accept exclusively DisplayPort (MiniDisplayPort ist in my case not working, no signal).I have 2 brand new thunderbolt cables and none of them seems to work with the MDP. I have switched to 1.2 DisplayPort so it should work with Apples Thunderbolt Ports with any isse andy the Intel Iris supports 4K at a 60Hz refresh rate... isn't it?
The standard DisplayPort works but accepts only 30Hz. I am on Yosemite, latest release: 10.10.3 and same happens with 10.10.4 beta release.
Strange thing: in the preference panel I have the option to choose between:

24Hz

30Hz

30Hz (huh, twice instead of 60?)

I am not able to find the issue. I am not sure if it is a problem related to the Philips 4065UC. Maybe something is wrong with Yosemite. This thin is driving me crazy and have a such beautiful screen at 30Hz is absolutely sad. Has some had any similar experience with this configurations?

MacBook Pro with Retina display, OS X Yosemite (10.10.3), Philips 4065UC

Posted on May 8, 2015 3:48 PM

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Answer 1

Jul 14, 2015 9:43 AM in response to www.abstract-cloud.com

Hey, you're the first one I've found with similar problems to mine...

I purchased the 4065UC back in March and was able to achieve 4K 60Hz operation over DisplayPort fine at first. However, sometime in the past month and a half things have gone South. I can no longer get the monitor to run at 60Hz no matter what I do. Before 4K/60Hz completely stopped working, there was a period where it would run for a little bit, but seemingly randomly switch to 30Hz (there would be a screen blackout first). Sometimes I could get it to go back to 60Hz by going into the display options, and switching the resolution a few times--, when I would switch back to 4K (3840x2160) from a lower resolution at which I *would* have 60Hz, it would stay at 60Hz... then switch back to 30 a few minutes later. Infuriating. However, this doesn't happen anymore (now I can't get 60Hz at all). I know my cable/port etc are fine since they can run another 4k monitor (Dell P2715Q) at 4K/60Hz just fine.

I suspect this issue was introduced with Yosemite 10.10.3, but I can't be sure. 10.10.3 caused many problems with external displays. 10.10.4 was supposed to fix these issues, but it hasn't done anything for my problem with the 4065UC. Please post an update if you figure anything out!

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