Colour depth changes to 6 bpc depth when increasing refresh rate after 1809 update

Hello there everyone!

Been a while since I posted on the forums. Hope that you're all doing well.

As the title says, I just updated my laptop (the P870KM1-G in my signature) to the 1809 update for Windows 10. I had to reset some stuff in the NVidia control panel to get it to my liking. However, I noticed that whenever I set my internal display to a refresh rate above 75 Hz, the output colour depth goes from 8 bpc to 6 bpc (pictures attached to show what I'm talking about).

This never happened before. I'm not to bothered by it as of yet as nothing seems to have changed, but I'm not entirely sure I could notice unless I switched the refresh rate back and forth multiple times and do a lot of testing, and I'm not about to do that. Plus I have no external displays to test this out on and I'm curious as to why this happens now and if I can "fix" it.

Note that Windows's own display settings recognizes the display as having 8-bit depth while at 100 Hz, so I have no idea if this is just a simple bug.

Has anyone had this occur to you? If so, did it go away or did you fix it? Did you notice any changes in video playback, games, or images or is everything as it should be?

EDIT: I nearly forgot! Hope that you've all had a wonderful Christmas, and that you have a wonderful new year ahead of you!

 

.If I didn't see any color banding I wouldn't bother. I did change monitor INF data few years ago to fix similar problem, but don't remember exact steps anymore, so here is MS way
https://docs.microsoft.com/en-us/windows-hardware/drivers/display/overriding-monitor-edids
Another way would be to replace with previous INF monitor file, if you could dig it out from oldwindows folder, if you still have it on the C: drive, but I'm not sure if Win10 monitoring system would allow it/replace it back, since last time I played with it was Win7. I used to have EDID reading program, to make sure monitor sends correct info, but again it's been a while I don't remember it's name and since most of my monitors are 6 bits and kind of hard to tell difference I don't bother anymore.
Sorry I couldn't be of more help, Merry Christmas and happy New Year to you.

 

So basically nothing to worry about since it's probably a simple text bug, as I haven't noticed any banding or any difference whatsoever in games, videos, websites, images, or anything. Plus if Windows itself says it's 8-bit, it's probably 8-bit.

Thank you so much for the link and advice though! I'm definitely saving this in case I need to go through that. I already dug out the Display's registration key from the previous installation's registry files and exported it, so that's great.

And shush about not being of more help, you've been INCREDIBLY helpful.

Thank you again!