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[SOLVED] HDR Disabled not reported to LG 27GN850-B monitor

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Posted (edited)

Hello- I'm having an issue where toggling HDR on/off in Catalina isn't being reported to my new LG 27GN850-B monitor. This is a problem as with HDR enabled in the monitor, I can only adjust brightness/sharpness & I can't seem to use the sRGB profile built into the monitor. There seems to be no way to manually disable HDR on the monitor.

Toggling HDR on/off in Catalina *does* affect the image; it's washed out with HDR on, but hyper-saturated with it off. The monitor, however, thinks it's getting an HDR signal either way.

I am connected via a DisplayPort & my RX580. Any ideas? Thanks!



macOS 10.15.4 High Sierra
core i5 7600k Kaby-lake @ stock 3.8ghz
ASRock Z270M Pro4
16 GB DDR4 2400mhz (Mushkin 2x8gbs)
Sapphire Radeon Pulse RX 580 8GB GDDR5
be quiet! 500w PSU

MOTU Ultralite mk4 USB audio interface






Edited by Tristana

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alright, the system is trolling me. I toggled it on/off a few more times and the monitor realized that it wasn't getting an HDR signal eventually.

Any ideas on a more permanent fix? I'm actually fine never using HDR with this monitor, but it'd be nice to have it so that toggling it... works as expected.

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In waking the monitor from display sleep, it thinks it's HDR again. :-/ 

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4 hours ago, enlaid said:

It's Catalina 10.15.4 bug not related to hackintosh:




Generate display override file using Hackintool or use script: https://gist.github.com/adaugherity/7435890

Awesome, thank you! I somehow didn't find this in my searching (though perhaps because I was using the 'Hackintosh' keyword when it's a general macOS problem).

The kext made by hackintool seems to be working.

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