Bright HDR Colors after 10.15.4 Catalina Update

I am using LG UL850-W. After upgrading to 10.15.4 and then met the same challenge. The color become very weird. The fix is also very simple:

1. Close the monitor
2. Unplugged the monitor
3. Reconnect the monitor to MacBook
4. Open the monitor again

Problem fixed.

Changing DP from 1.4 to 1.2 works for me perfectly. I saw you reply and tried it days ago. I’m not bothered by the ultra bright problem anymore! And I didn’t have to toggle HDR back and force anymore.

This has been driving me nuts on my LG 27UK600 for the last couple months - it seems to come and go.

When it comes back, I go into the Display Settings, toggle HDR on and off a few times, and it seems to go away.

I just noticed that LG released new OnScreen Control Drivers last week, so I updated to those today, did a restart, and it seemed to work ok, no washed out HDR colors.

I restarted a couple more times to test and it seemed to be fine.

YMMV.

Just upgraded to Catalina 10.15.4 without googling first whether this would be risky. Bad idea!

Same problem with my LG 27UK650 4KUHD and my 2017 MacBook Pro 15". My monitor is connected to my CalDigit TS3 Plus via DisplayPort and the CalDigit is connected to the MacBook via Thunderbolt.

Unplugging and plugging back in the Thunderbolt cable usually fixes it, although sometimes it also takes the HDR checking/unchecking trick, as well.

I notice that whether this sequence of kludgy fixes takes 1-3 tries seems to depend on whether my MacBook lid was open or not. So, some combo of unplugging/plugging in Thunderbolt, checking/unchecking HDR, and then closing/opening or opening/closing the lid definitely works every time. Ridiculous.

However, if Electric Sheep decided to launch itself when Screen Saver starts, which for some reason it doesn't always feel in the mood to do, then it seems to be harder to get the neon colors back to normal and I sometimes have to restart.

I'm resisting doing systematic tests of what works when because I don't want to jinx an update from LG or Apple.

LG had a 2/28/2020 driver update that I installed, but that didn't fix it.

What a ridiculous bug.

This appears, for me, to have been resolved by upgrading to Big Sur 11.0.1

I had the same issue of color being completely broken upon my upgrade to Catalina. Then I found the HDR checkbox.

By toggling the HDR checkbox, I've been able to get my LG back into SDR mode and looking as it used to. The problem is, when my laptop goes to sleep, the color looks broken again when I wake it up. Toggling the HDR checkbox sometimes resolves the issue. Other times it doesn't.

Being able to actually run the monitor in HDR mode would probably be ideal but it looks terrible currently, so SDR is preferred.

Anyway, it's obviously a bug in the way the OS is dealing with SDR/HDR.

Having the same issue with an LG 4k HDR monitor. I've found that checking and unchecking the HDR checkbox in System Preferences > Display multiple times seems to trick the display into showing colors correctly. I know that's not a true solution but it seems to work for now.

I just updated to 10.15.5 and sadly, no change in the issue for me. See my original post in this thread for details on my display issues.

I have had luck by changing my monitor to disable Displayport 1.2 support in the menu. You loose those feature but It seems to be displaying regular SDR content okay. I do NOT count this as a fix tho! :) @apple @LG.

Also, HDR still looks all wrong if left on for regular desktop use. This may not be the intent at this point but there is a milky contrast on the image and an ugly tint.

just chiming in same issue on LG monitor I fix by consistency hitting toggle until it corrects .. will stay like that while on but once goes to sleep flip back to the crazy neon bright hurt my eyes colors

Also unchecking HDR over here

I'm having the same problem. I did the macOS Catalina 10.15.4 Update last night (5/5/2020). When I started up my 2018 15" MBP this morning, my dual LG 27UL650-W monitors were really washed out. I found the HDR box in the System Preferences > Displays and un-clicked it. That seemed to help.

Later, a worse problem! After my MBP went to sleep, when I woke it up, I had one "normal" monitor and the other extremely bright where the colors were posterized. It looked terrible.

I have temporarily fixed this problem by resetting my monitors so the displays aren't so ultra-bright, and then changing the setting in my LG monitors to use DisplayPort 1.2 rather than 1.4. This causes my Mac to remove the HDR checkbox from the Display preferences screen for each monitor. I'm pretty sure I would be constantly battling the Mac OS without doing this.

I'm also using a CalDigit TS3 Plus dock. Both monitors are connected via DisplayPort on the backs of the monitors. One cable plugs into the Thunderbolt 3 port on my dock and the other plugs into the DisplayPort port on my dock. I don't think the dock is the problem.

Sadly, this is happening on my LG 32UD99 too, which is an HDR monitor and was working on 10.15.3.

On 10.15.4 with supplemental update I have to disable HDR or I get the same color issues.

Same on both MacBook Pro and Mac Pro (2009). Turning off the HDR setting resolves the issue.

override EDID is a better solution in my opinion, see my more recent post, or https://www.reddit.com/r/MacOS/comments/dkowz1/instructions_for_forcing_rgb_mode_in_catalina/