Mini display port show color lines when resolution changed to 4k on HD4000

[Swarzulu]

I have a solid Hack for several years. Config:
1. i7 3770k
2. GA Z77X-UP5 TH Mobo
3. No Graphic Card - Using onboard HD4000
4. 16 GB DDR3 Memory
5. HD100 Liquid Cooler
6. Sierra

What I did:
1. Got a MiniDisplay Port 1.2 to HDMI 2.0 cable (Which delivers 4k at 60Hz easy on work Macbook Air 2015) on a LG 4k TV. Works like a dream
2. Connected the Hack with Thunderbolt/Minidisplay to HDMI on the monitor. Also the HDMI cable to HDMI at the Monitor
3. Booted the system.
4. The display works on both outputs at 1080p
5. It also shows various resolution options all the way upto 4k (3840X2460)

Issue:
1. When I try to change the MiniDisplayport resolution to 4k in the System preferences it just shows flickering color bands in the screen and nothing is working
2. I then change the input in the LG TV to HDMI and then the display comes back up with 4k resolution even on the HDMI but its is very grainy
3. I can then mirror both the output to HDMI resolution and its all works at 1080p again.

What all I tried:
1. I tried to change the platform ID etc. but no luck
2. I tried to boot with Windows and got the resolution at full 4k at 60Hz from the MiniDisplayport to HDMI. Worked great with awesome 4k Display resoltuion

My current state and logical deductions:
1. The cable and Hardware are fine as validated by the Windows support and the OSX working at 1080p
2. I am missing some system config or some Kext setup.

Somebody please help. Mr. Moderator has helped so many. Please help this poor soul..

Thanks

 

[trs96]

The best resolution you can get from HD4000 on a Hackintosh is retina 2560 x 1440p. Not possible to get 4K at 60 Hz.

Your 2015 Macbook Air has HD6000 not HD4000. That's why you can get 4K @ 60Hz with the Macbook.

Graphics and Video Support for the 2015 Macbook Air
Intel HD Graphics 6000
Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 3840 by 2160 pixels on an external display, both at millions of colors.
Thunderbolt digital video output

 

[Swarzulu]

The best resolution you can get from HD4000 on a Hackintosh is retina 2560 x 1440p. Not possible to get 4K at 60 Hz.

Your 2015 Macbook Air has HD6000 not HD4000. That's why you can get 4K @ 60Hz with the Macbook.

Graphics and Video Support for the 2015 Macbook Air
Intel HD Graphics 6000
Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 3840 by 2160 pixels on an external display, both at millions of colors.
Thunderbolt digital video output

Thanks trs96. I would be happy to get even 2560X1440. As mentioned I did get 4k at 60Hz when I boot up the Hack on Windows 8.1. Windows shows full 4k with same hardware and cables i.e. HD4000. There is something I am missing in my clover setup that makes the display scrambled with Color strips. Is there a way of finding this out.

Appreciate all your help and support. Mr. Rehabman may have some answers. He is very busy I know. Thanks

 

[trs96]

Have you tried using an app like resextreme ?

http://resxtreme.com

 

[Swarzulu]

Yes I have. Even without it I can see the 4k resolution in the display options but when I apply the 3840 resolution the screen gets garbled. The strange part is when switch the display to HDMI direct output the it is in 3840 resolution but the fonts are smudged and unusable. Perhaps it has something to do with Thuderbolt mini displayport settings. Does this makes any sense. Thanks

 

[trs96]

If you are getting 4K @60Hz in Windows on your Z77 motherboard using HD4000 and the Th.Bolt port you are defying the laws of physics. See the following UP5-TH motherboard specs on the Gigabyte website.

Onboard Graphics
Integrated Graphics Processor:

1. 1 x D-Sub port
2. 1 x DVI-D port, supporting a maximum resolution of 1920x1200
   * The DVI-D port does not support D-Sub connection by adapter.
   * Simultaneous output for DVI-D and the MDP2 Thunderbolt port is not supported.
3. 1 x HDMI port, supporting a maximum resolution of 1920x1200

Intel DSL3510L chip:

1. 2 Thunderbolt ports (MDP1/MDP2) support for Mini-DisplayPort and Thunderbolt monitor(s), and supporting a maximum resolution of 2560x1600

Even though the option for 4K may be there it doesn't mean it will actually work. The best way to go for 4K on your system would be to buy a GTX 1030 gfx card and use the DP output. You can adapt it to HDMI with an active adapter.

 

[Swarzulu]

If you are getting 4K @60Hz in Windows on your Z77 motherboard using HD4000 and the Th.Bolt port you are defying the laws of physics. See the following UP5-TH motherboard specs on the Gigabyte website.

Onboard Graphics
Integrated Graphics Processor:

1. 1 x D-Sub port
2. 1 x DVI-D port, supporting a maximum resolution of 1920x1200
   * The DVI-D port does not support D-Sub connection by adapter.
   * Simultaneous output for DVI-D and the MDP2 Thunderbolt port is not supported.
3. 1 x HDMI port, supporting a maximum resolution of 1920x1200

Intel DSL3510L chip:

1. 2 Thunderbolt ports (MDP1/MDP2) support for Mini-DisplayPort and Thunderbolt monitor(s), and supporting a maximum resolution of 2560x1600

Even though the option for 4K may be there it doesn't mean it will actually work. The best way to go for 4K on your system would be to buy a GTX 1030 gfx card and use the DP output. You can adapt it to HDMI with an active adapter.

I am uploading 3 photos.
1. The Windows boot with 4k Resolution out of HD4000 via Mini Displayport
2. The messed up screen on Sierra at 4k (also at 2560X1440) via Mini Displayport
3. The 4k res screen for HDMI cable from HDMI port.

As you can see the system seems to be putting out 4k but somehow the screen is messed up via MDP.
I am missing something. Please help. Thanks so much

 

[trs96]

Try posting somewhere that Toleda could help you troubleshoot this. It's likely that you will need a MDP to HDMI active adapter for this to work at 2560 X 1440p on the macOS side.

 

[Swarzulu]

Try posting somewhere that Toleda could help you troubleshoot this. It's likely that you will need a MDP to HDMI active adapter for this to work at 2560 X 1440p on the macOS side.

I do have the active DMP1.2 to HDMI 2.0 Cable. Thats how it works on Mcbook air 4k at 60Hz.

Could you please tell me where I should post this to get Toleda's attention. Thank you so much for all your help.

 

[trs96]

I do have the active DMP1.2 to HDMI 2.0 Cable. Thats how it works on Mcbook air 4k at 60Hz.

Could you please tell me where I should post this to get Toleda's attention. Thank you so much for all your help.

I don't think he has signed in yet today so hopefully he will check the Graphics forum and see your thread once he does later on today.