Display Resolution In Boot Camp

Question

Display Resolution In Boot Camp

I have two 4K monitors connected to my 2017 iMac 5K. One is the LG 27UK850 and the other is the LG 43MU79-B. When working in "Mac Mode" I have no issues connecting to either monitor as they both have dedicated USB-C connections to the iMac. When I boot in to boot camp, I get a lot of screen flickering on both displays. Once that stabilizes, the LG 27UK850 displays at the appropriate resolution but the LG 43MU79-B displays at 1080P or worse. I have tried to update the drivers, switch cables, ports, etc. without any improvement. I have found others with similar issues but it would appear that the drivers or the cabling were the issues in that case. Open to ideas if you have them. Thank you!

iMac 27" 5K, macOS 10.15

Posted on Apr 29, 2020 5:46 AM

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Answer 1

Loner T

Level 9

59,536 points

Apr 29, 2020 10:52 AM in response to BurgertimeXXL

The number of monitors and resolutions on the same iMac running macOS and Windows varies and can be different, due to driver dependencies.

Are you running the latest AMD driver?

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Answer 2

Loner T

Level 9

59,536 points

Apr 29, 2020 5:44 PM in response to BurgertimeXXL

Please post back if the problem persists after a clean installation.

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Answer 3

Apr 30, 2020 10:28 AM in response to Loner T

Still had the same issue on the fresh download and install. I don't believe it can support dual direct USB-C. I was however able to get it to connect via HDMI. Also, there appears to be a broader issue with my system and boot camp (issues with restarts, etc.). At this point, I'm just giving up since my only goal was to use boot camp for a few games and its just not worth the aggravation. Thank you for the help.

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Answer 4

Apr 29, 2020 10:55 AM in response to Loner T

I am and that was the first area I went to. One thing I have not yet tried is that I may have had a bad install on Windows. Windows never loads correctly the first time and I need all devices unplugged to work. I plan to start from scratch when I have more time to see if that fixes the issue or not.

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Answer 5

Loner T

Level 9

59,536 points

Apr 30, 2020 10:44 AM in response to BurgertimeXXL

Take a look at Use an external display with your iMac - Apple Support. The older link - Connect multiple displays to your iMac Pro - Apple Support for an iMacPro shows the Bus layout. Try connecting your displays to ports on different busses.

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Display Resolution In Boot Camp

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