OSX 10.15.4 colour problem on external monitors

I had to reinstall my MBP for another reason. With the fresh install, the issue came up immediately. I tried the suggestion of changing the setting and rebooting, but this didn't last.

The only way that works for me are the steps I described earlier, by telling the OS that my monitor is not capable of HDR but only RGB.

@Apple: As of now, "112 have this problem, too". Time to do something, or give a reaction in any way, don't you guys think?!

Just wanted to let everyone know that on my LG 27UK850-W, I got so tired of this that I switched from using the DisplayPort to the HDMI input, and have not had this happen since.

Logically, because there is no HDR option with the HDMI input, but still... we should be able to use whichever we want.

I have the exact same problem. Turning off HDR makes it look better again, but I think it looked even better before the upgrade to 10.15.4 :(

I hope Apple is reading this, and fixing it SOON

I experienced the same blue tint issue too after updating to 10.15.4.

Turning off HDR gets things back to normal.

Thanks for sharing. Using HDMI works for me as well! (Had to buy two cables though...)

I had the same problem. It took several restarts, but eventually the HDR option showed up and I was able to uncheck it, and it is back to normal. I disconnected my monitor from my MBP, reset the monitor to factory settings, unplugged/replugged, and restarted my MBP. The second time I restarted my MBP, the HDR option showed up for the monitor.

If anyone is interested I have a small applescript that I use to fix the colors. It takes around 20seconds to run but so far it has worked for me every time. https://gist.github.com/adriang133/d0b92a349d097e63a1790a0bfd0eeaf9

unchecking the HRD option works but on my mine, every time it returns from sleeping HRD mode is back on automatically. I have to check and uncheck the option EVERY time it comes back from sleep! its very annoying!

I shut off the HDR option and it did make it much better, but I can't quite get it back to the pre-10.15.4 quality. The Q&A here have been helpful, but does anyone know if Apple is actively working on a fix? Is this something I should bring up to my monitor manufacturer. (I'm using an LG HDR WQHD 34" running @ 3440x1440.) Thanks!

Amazing!! How didn't we think about it!?

The HRD setting are triggered automatic, despite what you check or uncheck. That is the problem!

I have to check/uncheck that box EVERY time the computer returns from sleep like 4 times at least until the problem is solved.

Dell U2720Q Same issue here. Set the Monitor to "Display HDR" and BOOM colours are washed out.

Went to Display settings and unticked the "High Dynamic Range" option and the screen looks much better.

Now the question is with setting off is the HDR off from the OS therefore no HDR signal is being sent to the display?

OSD has the HDR setting on and im using a DP 1.4 cable on an 15" MBP 2018

Add me to the list of people having this problem. Every time my LG monitor sleeps, I need to do the "check then uncheck" HDR option in system preferences to get my colors back to normal. Super annoying.

After discovering this is a widespread problem, the only solution for now is the "toggle HDR on then off" method until the display looks normal again.

Nothing else seems to help until Apple fixes the bug. I just set my display sleep time to be longer, so I run into this less often each day.

I have found you have to turn HDR off, then restart machine, then turn monitor off for it to go back to normal on, just turning off on its own doesnt work.

I just took delivery of my brand new LG 38" Ultrawide monitor, yesterday Model: 38WK95C.

I have a brand new MacBook Pro 16" that I got a few days earlier.

I plugged in the monitor with the supplied USB-C cable and was shocked at how bad the colors were. They were extremely hot (pinks were neon hot pink, blues looked more like a purplish indigo and the whites had a greyish tinge. To add insult to injury, there was no way to adjust most of them in the on screen controls as most of the options were greyed out an inaccessible. Contrast, Color Temp, even all of my gaming related controls were inactive. The only thing I could do was adjust brightness and flip through four preset HDR related options; but they were all just as bad as the default one.

I spent the better part of a day doing research online trying to figure out what was wrong and how to fix it. Most things I found said that it was a limitation of the USB-C connectivity and that I should use HDMI instead. I didn't want to do that as I wanted to have the single cord charging and connectivity.

And for a monitor that was around $1200, I didn't want to settle for that.

It wasn't until about 30 minutes ago, after failing to get through to LG's support (due to COVID-19 related hour restrictions) that I came across this page.

You have no idea how happy I am that it's not my monitor that is defective. I was beginning to think I would need to return the monitor and find a replacement.

Any idea when there will be a fix that will allow me to turn HDR back on, and not affect my ability to use my monitor's settings?

If I can provide any further details that helps with the troubleshooting process, I'm happy to help.

If it weren't for the fact that I just pulled this out of the box, yesterday, and it was bad from the get go, I would have been more inclined to look into the apple side of things. I had no reason to suspect that, though, and instead assumed that it was the monitor that was problematic.

To think I almost returned this beautiful monitor.

:(

Thank you to the person who suggested temporarily turning off HDR. I just hope there's a solution that fixes this, sometime soon.