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XPS 15 9550 HDMI output not working 10.12.2

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I am using iMac17,1. That worked for 10.11.6. Which SMBIOS should I use then?

I also do not get 4k display after the CoreDisplay fix which enabled graphic acceleration.
 

RehabMan

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I am using iMac17,1. That worked for 10.11.6. Which SMBIOS should I use then?

For external HDMI/DP, anything but iMac17,1. Try iMac14,2, for example.
 
Joined
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Dell XPS 15 9550
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6th Generation Intel® Core™ i7-6700HQ Quad Core
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NVIDIA® GeForce® GTX 960M with 2GB GDDR5
nice. imac14,2 gave me HDMI out!

one more question: how do I get 4k resolution? without graphic acceleration (0x12345678 setting), it actually gives me 4k resolution but of course lots of screen glitches. with the graphic acceleration on, I don't 4k resolution. See my display preference.
 

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RehabMan

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nice. imac14,2 gave me HDMI out!

one more question: how do I get 4k resolution? without graphic acceleration (0x12345678 setting), it actually gives me 4k resolution but of course lots of screen glitches. with the graphic acceleration on, I don't 4k resolution. See my display preference.

You are getting 4k.
 
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I am using iMac17,1. That worked for 10.11.6. Which SMBIOS should I use then?

I also do not get 4k display after the CoreDisplay fix which enabled graphic acceleration.
Wow how do you get that prefpane
 

RehabMan

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I don't think I am getting 3840x2160 resolution...

Of course you are. Make a screen shot image, and analyze the details of the resulting file and you'll see...
 
Joined
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Dell XPS 15 9550
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6th Generation Intel® Core™ i7-6700HQ Quad Core
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NVIDIA® GeForce® GTX 960M with 2GB GDDR5
Of course you are. Make a screen shot image, and analyze the details of the resulting file and you'll see...
I don't think so. When I boot with ig-platform-id=0x12345678, I get 3840x2160 resolution wo/ graphic acceleration. 1920x1080 with ig-platform-id=0x191b0000...
 
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