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CAC-1170 – Mac Mini 4096×2160 60hz – screen turns blue or green after waking up from sleep

Updated on 09-04-2017 in Adapters and Cables
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14 on 08-02-2017

Computer: Apple Mac Mini (Late 2014) 2.8 Core i5 with Intel Iris Graphics
Monitor: LG 27UD68-W.AUS

I purchased this adapter CAC-1170 (REV.:A3-00) because when I use a HDMI cable, or Mini DisplayPort to HDMI passive cable, it only runs at 4096×2160 30hz or 1920×1080 30hz HDPI

I connected the adapter CAC-1170 via Mini DisplayPort and connect to monitor with a HDMI cable, I can get 4096×2160 60hz or 1920×1080 60hz HDPI, which is great, but there is a problem: when the computer goes to sleep mode, or the display turn off after a while, and when I try to wake up the Mac mini, the screen is blue, sometime is green, when I try to restart the computer, it simply doesn’t restart correctly, the monitor shows no signal, so I have to remove the adapter and connect to the HDMI port, then reconnect the adapter after it’s finished booting into macOS.

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MST1407 1 on 08-02-2017

Hi Kevvmkev,
Sorry to hear this.
What version MAC OS are you on ?

kevwkev on 08-02-2017

Hi MST1407, thanks for your response. It’s running Sierra 10.12.3

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kevwkev 5 on 08-02-2017

correction: it’s running at 3840×2160 @ 60hz or 1080p HDPI, not 4096×2160

MST1407 on 10-02-2017

sounds like the adapter loses not only signal but also power when system is put to sleep,  and is not woken up when the system does …
Normally jsut reconnecting the adapter will make it rebuild the signal and work properly again. No solution fo this one yet from R&D 🙁

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kevwkev on 10-02-2017

After waking up from sleep with a green/blue screen:
1. I have to shutdown the computer
2. remove the adapter, connect to hdmi port
3. start the computer
4. connect the adapter when it finishes
booting to OS

Basically the adapter stopped working completely after waking up from sleep and only a full power cycle with cable change can restore the functionality of the adapter.

I have also updated the adapter to latest firmware provided by Club3D support, still no dice. This is truely frustrating…

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MST1407 on 13-02-2017

Hi kevwkev,

I have send a reminder to R&D … 

Will get beack to you as soon as i get feedback.

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kevwkev on 23-02-2017

Hi MST1407, any updates from R&D?

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jacobmarble on 27-02-2017

I’m having a similar problem.
MBP 15 inch mid-2015
macOS 10.12.3
Samsung KU6290 (same as KU6300 with different remote control)

My CAC-1173 worked once, looked beautiful at 4k/60hz. Before and after that one time, I see a black or dark blue screen, with 1/4″ of purple or green haze at the top. Disconnect, reconnect, reboot, turn on and off, nothing works. Both the TV and the computer report that 4k/60hz is working.

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kevwkev 4 on 23-02-2017

Hi MST1407, any updates from R&D?

MST1407 on 28-02-2017

just received a firmware update this morning.
The updater program does not work under MAC OSx unfortunately , so the update will need to be done on windows …

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MST1407 on 28-02-2017

firmware will be send over by [email protected]

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kevwkev on 26-03-2017

I am still getting the exact same problem after the latest firmware update….

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MST1407 on 27-03-2017

Good day,

Sorry to hear this, i will have to check with R&D for further suggestions on that “wake-from-sleep” issue. Will get back to you asap.

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jacobmarble 0 on 09-04-2017

Behavior changed slightly with MacOS 10.12.4. Now, 4k@30Hz sometimes works, but not every time. After wake, I have to unplug/plug the adaptor once, twice, or more times. 4k@60Hz seems to be always unavailable. I’m using a standard HDMI-HDMI adaptor currently, because it works with 4k@30Hz reliably.

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