4K UHD LG TV with Yosemite and Intel HD4600 - full resolution

[nyjt]

Hi,

 

I have an issue with my new 40" UHD LG TV (40UF695V) that I want to use with my Yosemite. My hardware is a Gigabyte Z97x-ud3h-bk motherboard with a i7-4790K cpu. And I want to use my integrated graphics HD4600. I don't want to buy a dedicated one while I don't use any 3D application or game.

 

The problem is the OS X does not allow to select the max resolution (3840 x 2160). I tested this resolution with Ubuntu live USB stick and the TV work perfectly with my HDMI cable at 4K@24Hz. The TV max Hz is 60 but my HD4600 has a 24Hz limitation. This 24Hz would be perfect for me (I try it out in Ubuntu), but I think OS X block this setting somewhere.

 

How can I unlock this setting and select the max resolution? (Edit some files, patch some kexts, clover setting, etc.)

 

Thanks in advance.

 

 

 

[PippoX0]

Just one try :

Extract EDID info of your UHD tv with Linux live.

Then inject Edid in DSDT or monitor info in displays/overrides or simply setting in Clover.

Search on forum for howto

 

You can not use UHD tv because Osx doesn't recognize it.

[nyjt]

Thanks the reply. I'll try this.

[nyjt]

It does not help.

 

BTW, ioreg contains the right EDID without injection:

$ ioreg -l | grep IODisplayEDID
    | |   | |         "IODisplayEDID" = <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>

[jperkins909]

Might be worth a shot to try creating a custom resolution using SwitchResX

http://www.madrau.com/data/switchresx/SwitchResX4.zip