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javiercarrillo

macrumors newbie
Mar 30, 2021
10
4
There is a new beta of MacOS Big Sur. I wonder if anyone is trying that and if it has brought any improvement to the RGB output? :/
 

decat

macrumors member
Oct 20, 2019
71
26
I'm running the new beta and at the moment using an AOC monitor via HDMI. Can't see any difference to be honest. The monitor settings don't show in what mode it runs. :(
 

LeoMainini

macrumors newbie
Apr 5, 2021
1
0
Boys i think i may have found the issue, on my end it was the display port version, hdmi was a no go, nothing got it out of limited range ycbcr444, got a usb-c to DP cable, still ycbcr, changed the display port version on my monitor to 1.1 instead of 1.2 with hdr and boom, RGB444 full range, everything looks acurate again :)

Not mad about loosing hdr as my monitors max brightness is like 400 cd/m2, nothing special, and the monitors hdr calibration is unchangable and poopoo, but ymmv

This is the cable if anyone wants to give it a try, its pretty cheap, but i imagine any usb-c to DP cable works fine

I also had intermitent ghosting and flickering, but ive been using this for close to an hour without any issues as well but its too soon to tell

Edit: Ocasional flickering and lines across the screen are still definitely present, bummer
 
Last edited:

jefo13

macrumors newbie
Jan 15, 2013
22
0
Boys i think i may have found the issue, on my end it was the display port version, hdmi was a no go, nothing got it out of limited range ycbcr444, got a usb-c to DP cable, still ycbcr, changed the display port version on my monitor to 1.1 instead of 1.2 with hdr and boom, RGB444 full range, everything looks acurate again :)

Not mad about loosing hdr as my monitors max brightness is like 400 cd/m2, nothing special, and the monitors hdr calibration is unchangable and poopoo, but ymmv

This is the cable if anyone wants to give it a try, its pretty cheap, but i imagine any usb-c to DP cable works fine

I also had intermitent ghosting and flickering, but ive been using this for close to an hour without any issues as well but its too soon to tell

Edit: Ocasional flickering and lines across the screen are still definitely present, bummer
I just switched my HP V28 to DP 1.1, can't really tell the difference... Time will tell my issue has been what your Edit described thus not very hopeful here...
 

GBoGBo

macrumors newbie
May 23, 2021
1
0
Hi all, new to Apple (from Windows and Linux), I had the same problem when connecting my Mac Mini M1 in HDMI to my old good LG 23 inch monitor (1080p) : horrible colors, bad gamma and red text difficult to read. I have inserted an active "HDMI Splitter 1 in 2 Out" in the HDMI path, and the problem is gone. Cost : 12 Euros on amazon.
I keep the Mac of course, but I don't known what to think about Apple now...
 

funwithstuff

macrumors regular
Jun 23, 2003
129
126
Brisbane, Australia
On my LG 4K 27" monitor, this problem seems to be fixed as of Big Sur 11.4. Yesterday I had bad gamma and colors through a Thunderbolt dock to DisplayPort, and today it looks fine. HDMI was always OK, but using DisplayPort bypasses an active adapter which didn't always sync up at 60Hz.
 

john4jack

macrumors newbie
Aug 2, 2021
1
0
I tried installing the software of an i1Display Pro calibrator (ver. 1.0.1) on a new 24" iMac w/M1chip. It crashed the computer 4 separate times.
 

Ninja Dom

macrumors 6502a
Feb 12, 2007
646
145
Update, running Monterey beta 9 and my Dell U2720Q now defaults to RGB (USB-C To USB-C) and it looks great! Let's hope it's finally fixed.
Woah, so after almost a year, we’re finally at where we wanted to be? And by default with no changes required?

How are the fonts? Blurry?
 

Ninja Dom

macrumors 6502a
Feb 12, 2007
646
145
Good news.

I’m not running any of the Monterey Betas so I’m gonna have to wait for the final release.

Crazy that I’m almost used to the non-sharp display that I’ve currently got as that’s all I’ve known since I got the M1 Mac mini in December 2020.
 

jelu77

macrumors member
Original poster
Dec 1, 2020
40
13
Thailand
The Dell U2720Q is a 4K monitor right? Aren't the text too small by default?
Yes it it is a 4K monitor and the fonts are very small by default, too small, at least for me. But I use scaling to get the size that looks good for me. Don't go with a lower resolution monitor, I used a 24" 1080p monitor temporarily and the fonts looked awful.
 

engseng

macrumors member
Sep 15, 2016
35
18
Malaysia
Yes it it is a 4K monitor and the fonts are very small by default, too small, at least for me. But I use scaling to get the size that looks good for me. Don't go with a lower resolution monitor, I used a 24" 1080p monitor temporarily and the fonts looked awful.
Can tell me which scaling do you use? If I am not mistaken, macOS will only show images at native 4K resolution only if the Larger Text (looks like 1920 x 1080) or the More Space (3840 x 2160) option is selected.
 

williamtracy

macrumors newbie
Jul 22, 2010
11
2
I've been running a M1 MBP to a LG CX 55 for the last year over USB-C to HDMI at 4K60 non HDR without much issue for the last year. I've now upgraded to 16" Max and switched to HDMI out which enables HDR as an option. However the instant it's on, the clarity/perceived resolution (most noticeable in text) takes a noticeable hit, seemingly a subsampling issue?

I'm much of a layman to this, but in going through this thread and a few others I haven't been able to find a clear answer as to if there's a way around it? Is there currently no way to push 4K60 HDR at full capacity through either HDMI or USB-C-to-HDMI to a CX?
 

Pressure

macrumors 603
May 30, 2006
5,182
1,545
Denmark
I've been running a M1 MBP to a LG CX 55 for the last year over USB-C to HDMI at 4K60 non HDR without much issue for the last year. I've now upgraded to 16" Max and switched to HDMI out which enables HDR as an option. However the instant it's on, the clarity/perceived resolution (most noticeable in text) takes a noticeable hit, seemingly a subsampling issue?

I'm much of a layman to this, but in going through this thread and a few others I haven't been able to find a clear answer as to if there's a way around it? Is there currently no way to push 4K60 HDR at full capacity through either HDMI or USB-C-to-HDMI to a CX?
It's not possible as HDMI 2.0 doesn't have enough bandwidth available for 4K @ 60Hz and 10-bit color.
 
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DJAKO

macrumors 6502a
Sep 8, 2006
601
21
Michigan
Does the Dell U2720Q support RGB when going HDMI -> HDMI on an M1?

I had to do the com.apple.windowserver.displays.plist tweak to force RGB on my U2715H, but it won't be permanent.

I run a three monitor setup, two with USB C and one with HDMI.
 
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