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Author Topic: Unable to boot to macOS with DisplayPort connected  (Read 390 times)
Spacedust
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« on: March 30, 2017, 09:00:54 PM »

It started few days ago with 10.12.4. Tried reverting back to 10.12.3 but no luck.

When I start with DVI then reconnect to DisplayPort it works again - 4K@60 Hz on flashed AMD HD7950 card. I tried other AMD cards and the same. It works fine only on NVIDIA cards.
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dijitalitrx
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« Reply #1 on: April 01, 2017, 01:13:14 PM »

FWIW I had the same problem with a flashed 280x but I couldn't find a solution, booted fine once the DP was unplugged..
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Spacedust
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« Reply #2 on: April 01, 2017, 06:30:03 PM »

FWIW I had the same problem with a flashed 280x but I couldn't find a solution, booted fine once the DP was unplugged..

The funny thing is HD7870 using Futomaki framebuffer boots just fine with DP connected 4K@60Hz.

Other problem I've found on some cards (R9 280 and R9 280X) is a DVI going black after boot screen with Apple Cinema HD 23" display. I have to reconnect the display and then all works fine. No such problem on other ports or other displays (even 4K).
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