No available patch for Yosemite public release (14A389)

[peterhajas]

It looks like the .command has been updated for a Yosemite beta, but not for the public release.

The md5 of IOKit on my system is:

2a8cbc2f6616d3f7a5e499bd2d5593ab

[Floris497]

See my fork: https://github.com/Floris497/mac-pixel-clock-patch I just added support for the public release.

[from2001]

I tried Floris497 version on my Mac mini late 2012 with Yosemite, but I am still not able to change screen resolution to 4k. I was able to use 4k with Mavericks even without this patch. Do you have any tips or advice for me?

[tiagojrocha]

I'm exactly the same problem!

I tried Floris497 version on my Mac mini late 2012 with Yosemite, but I am still not able to change screen resolution to 4k. I was able to use 4k with Mavericks even without this patch. Do you have any tips or advice for me?

[Floris497]

I was not sure it worked, but it may not be the pixel clock then, my macbook air 2013 will not do 4k but my mini 2011 will, but i have not used the public release there, but on the golden masters it worked, so i only changed the md5. I will look into it tomorrow morning.

[Floris497]

I got to test mine and it works as expected.. (mac mini 2011 AOC 4k Displayport[40Hz]/hdmi[30Hz]) so there is something else getting in the way... i'm trying to fix the same thing for my macbook air, where the 2011 model works the 2012/2013/2014 model will not 😭

[from2001]

Hi Floris497,
I executed
md5 -q /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
and got
7a1a25493dd7b012cad81bdb9b0ae78a
, which is different from your code.

Could this md5 hash be different with different Mac models even on the same version of Yosemite?

[Floris497]

Can you look up the exact version of your os? I'm sure i'm running the correct one, can you see if there is a bak file in the directory? You might be on the wrong version (14A388 = last GM 14A389 = public release) or you already ran it, if you have no bak file, the easyes is to just put your md5 in de 10.10 variable at the top of the file and run it again ;) should work.

The md5 from a clean install can not differ in any way, the are the same unless you changed the file or maybe resigned the original one. (in the last case, just replace the md5 in the top of the file)

Do you use switchresx to add a resolution to your display?

[from2001]

Hi Floris497,
I confirmed that my Yosemite is public release (14A389).

Do you use switchresx to add a resolution to your display?
I have switchresx on my Mac, but i don't use it now.

the easyes is to just put your md5 in de 10.10 variable at the top of the file and run it again ;
I put my md5 value to the source code and ran it, but it didn't work...

can you see if there is a bak file in the directory?
What kind of bak file are you talking about, and which directory should I find at?

[Floris497]

Oh sorry, if you run the patch the script will produce a backup file IOKit.bak, that should be in the same directory as the original/patched version of IOKit.

most of the time, your system does not know about the 4k resolutions, so you need to add it to the custom resolutions of your display.

note that if you have a dedicated AMD/Nvidia card this mod will not currently work, but they are easy to patch, but i have no way of testing them nor do i know how to make them yet.

I hope your IOKit got patched, and your system just does not understand the resolution yet, this can be fixed with xswitchres as said before.

Hope this helps you.

[rogdog]

Floris: Awesome! I've been miserable since Yosemite killed my Seiki 4K monitor. It was so great to see 3840x2160 (30 MHz) reappear in my SwitchResX resolutions! In the future, I need to be more careful about upgrading. Either that, or learn to follow the formula so I can contribute a new patch.
PS: I'm using a 2011 Macbook i5 with the Accell B086B-008B Mini DisplayPort 1.1 to HDMI 1.4 Active Adapter.

[Floris497]

rogdog: this time it was really simple, I just added the md5 hash and voila, new patch, i have produced 1 patch for myself so I knew how it was done, and it took me quite some time to finally understand it.
So in a short time i will add my own guide for making the patch, and also one for the nvidea/amd (those are really simple from what I heard)

[from2001]

Hi Floris497,
I don't still get it working.

I think the patch is correctly executed (I have IOKit.bak file in /System/Library/Frameworks/IOKit.framework/Versions/A/ ).

I added custom resolution on Switchresx referring to this site.

Switchresx custom resolution status says "Not activated - Invalid?".

By the way, after I used the patch, the md5 hash value changed to another string. Is this normal?

[peterhajas]

from2001, I'm getting the same problem with Floris497's patch. I'm using a 2012 Mac mini with the Seiki attached through the HDMI port.

[rogdog]

If you are having trouble, I suggest that you ensure you are using an HDMI 1.4 Active Adapter. As an experiment, I temporarily replaced mine with an old passive adapter that worked fine with smaller monitors. Didn't work!

[TundraTech]

Hi there I have a 2012 mac mini running Yosemite, I'm about to pull the trigger on a new set of displays for my second office. Currently I'm using two TB displays, but i can get 2 * 4k displays for cheaper.

Is there a solution that will work here under Yosemite yet?

From what i understand you need:

active HDMI to DP adapter such as This
patch IOKit
copy of switchresX?