DP/USB-C/Thunderbolt 3/4 to HDMI 2.1 4k@120hz RGB4:4:4 10b HDR with Apple Silicon M1/M2/M3 now possible !

[davewolfs]

Is there any mechanism to control the order in which displays connect?

I have an issue where if monitor B connects before monitor A I cannot run monitor A at the optimal refresh rate. I want to make sure that Monitor A always connects before B and would like to do this without having to manually turn them on off Eg on wake from sleep. Is this even possible?

It is stupid that the order even matters ideally you could have the OS only reserve so much bandwidth for Monitor B.

 

[Alcyoneous]

I'm using lg C2 with a mac studio (Ventura Ver 13.4.1 (c) and was able to flash with cable matters VMM7100. I now have 3840x2160 120hz RGB 10bit, thank you.

BUT, has anyone encountered issues when putting mac to sleep or restarting the mac, the screen says no signal. I have to keep unplugging and plugging the cable and playing with the betterdisplay resolution settings to get it back to work. And unplugging and plugging cable doesnt always work from the first time. It's extremely annoying.

@Vlad123x did you ever solve this problem? I'm trying the hammerspoon script that was shared but it doesn't seem to be totally working if in clamshell mode

 

[peignoir]

@Vlad123x did you ever solve this problem? I'm trying the hammerspoon script that was shared but it doesn't seem to be totally working if in clamshell mode

it kinda works for me, I'm still looking for a pattern ... but it seems to wake up if I wait a little. I just did it / will need more data... I use WoL and when I see no signal I press a key / mouse again and wait few seconds (LG c2 / MacBook m1 clamshell)

fyi my Hammerspoon logs:

2023-10-24 03:15:23: Received event: 11 screensDidUnlock
2023-10-24 03:15:23: LG TV is connected
2023-10-24 03:15:23: Waking screen.
2023-10-24 03:15:23: Executing command: ~/opt/lgtv/bin/lgtv MyTV on ssl
2023-10-24 03:15:24:
2023-10-24 03:15:29: Executing command: ~/opt/lgtv/bin/lgtv MyTV on ssl
2023-10-24 03:15:30:
2023-10-24 03:15:30: TV was turned on
2023-10-24 03:15:30: Executing command: ~/opt/lgtv/bin/lgtv MyTV getForegroundAppInfo ssl
2023-10-24 03:15:30: {"type": "response", "id": "0", "payload": {"returnValue": true, "appId": "com.webos.app.hdmi3", "processId": "", "windowId": ""}}
{"closing": {"code": 1000, "reason": ""}}
2023-10-24 03:15:30: Event ignored
2023-10-24 03:15:30: Received event: 1 systemWillSleep
2023-10-24 03:15:30: No screens are connected. Please check the 'connected_tv_identifier' in the 'lgtv_init.lua' script matches your connected screen.
2023-10-24 03:15:30: TV was not turned off because it is not connected
2023-10-24 03:15:31: Received event: 10 screensDidLock
2023-10-24 03:15:31: Event ignored
2023-10-24 03:15:31: Received event: 0 systemDidWake
2023-10-24 03:15:31: No screens are connected. Please check the 'connected_tv_identifier' in the 'lgtv_init.lua' script matches your connected screen.
2023-10-24 03:15:31: TV was not turned on because it is not connected
2023-10-24 03:15:32: Received event: 11 screensDidUnlock
2023-10-24 03:15:32: LG TV is connected
2023-10-24 03:15:32: Waking screen.
2023-10-24 03:15:32: Executing command: ~/opt/lgtv/bin/lgtv MyTV on ssl
2023-10-24 03:15:33:
2023-10-24 03:15:38: Executing command: ~/opt/lgtv/bin/lgtv MyTV on ssl
2023-10-24 03:15:39:
2023-10-24 03:15:39: TV was turned on
2023-10-24 03:15:39: Executing command: ~/opt/lgtv/bin/lgtv MyTV getForegroundAppInfo ssl
2023-10-24 03:15:40: {"type": "response", "id": "0", "payload": {"returnValue": true, "appId": "com.webos.app.hdmi3", "processId": "", "windowId": ""}}
{"closing": {"code": 1000, "reason": ""}}
2023-10-24 03:15:40: Event ignored

 

[privaterbok]

An interesting find that the Dell USB-C dock actually support 4k@120hz 10bit HDR natively on MacBook M1/M2 w/ betterDisplay.

I recently purchased this Dell HD22Q USB-C dock, It claimed only support 4K@60hz or 8k@30hz but says it's HDMI 2.1 compatible:



But when I hook it up with my MacBook Pro M1 Pro, it magically support 4k@120hz 10bit natively:

I thought there is no way this thing can support 4k@120hz natively given we have tried numerously way to get that working with help of custom firmware, but it's right there. without any probe or tinkering, it support 4k@120hz on my LG CX(more explain later).

Then I changed to my Windows laptop and using the tool to read what chip and firmware it use, it showed this
So looks like a VMM6211 running firmware 6.05:

Also under Windows, it can output 4k@120hz 10bit without problem:

Since it's running VMM6211 chip, I think the reason it can output 4k@120hz under mac is because I have betterDisplay with EDID custom running at the background because my main adapter is a cable matter VM6100 adapter, so I did my due diligence back when @stevemr123 post his original method.

To verify my hypothesis, I use my wife's MacBook Air M2, which officially don't support 4k@120 10bit natively, It sure can't output 4k@120 10bit, only 4k@60 8bit output like before. But after I installed betterDisplay and created mod custom EDID file, it works again.

TL;DR:

Dell HD22Q USB-C dock can support 4k@120hz 10bit natively under Windows and MacOS(w/ custom EDID from betterDisplay), it's build on VMM6211, so for whom like to utilize more features like PD charging in a single cable/output 4k/USB ports for peripherals, this is a great choice.

Thanks @AironMan and @stevemr123 for the great work!

 

[Zorast]

An interesting find that the Dell USB-C dock actually support 4k@120hz 10bit HDR natively on MacBook M1/M2 w/ betterDisplay.

I recently purchased this Dell HD22Q USB-C dock, It claimed only support 4K@60hz or 8k@30hz but says it's HDMI 2.1 compatible:

View attachment 2300937

But when I hook it up with my MacBook Pro M1 Pro, it magically support 4k@120hz 10bit natively:

View attachment 2300938
I thought there is no way this thing can support 4k@120hz natively given we have tried numerously way to get that working with help of custom firmware, but it's right there. without any probe or tinkering, it support 4k@120hz on my LG CX(more explain later).

Then I changed to my Windows laptop and using the tool to read what chip and firmware it use, it showed this
So looks like a VMM6211 running firmware 6.05:
View attachment 2300940


Also under Windows, it can output 4k@120hz 10bit without problem:

View attachment 2300939

Since it's running VMM6211 chip, I think the reason it can output 4k@120hz under mac is because I have betterDisplay with EDID custom running at the background because my main adapter is a cable matter VM6100 adapter, so I did my due diligence back when @stevemr123 post his original method.

To verify my hypothesis, I use my wife's MacBook Air M2, which officially don't support 4k@120 10bit natively, It sure can't output 4k@120 10bit, only 4k@60 8bit output like before. But after I installed betterDisplay and created mod custom EDID file, it works again.

TL;DR:

Dell HD22Q USB-C dock can support 4k@120hz 10bit natively under Windows and MacOS(w/ custom EDID from betterDisplay), it's build on VMM6211, so for whom like to utilize more features like PD charging in a single cable/output 4k/USB ports for peripherals, this is a great choice.

Thanks @AironMan and @stevemr123 for the great work!

Yes it looks like the VMM6211 works like an VMM6100 only with EDID override. We now that EDID override can be use on many Adapters in most cases only 4:2:2, in your case it looks like it can handle 4:4:4

 

[DaSal]

Does anybody know if 4K 120hz works if you connect directly through USB-C (usb-c to usb-c)? The Philips Evnia gaming monitor has usb-c for input. (42M2N8900)

Will the 4K/120hz limitation still be a problem in that case? Or is it only a problem when using a dongle that converts usb-c into HDMI?

 

[Zorast]

Does anybody know if 4K 120hz works if you connect directly through USB-C (usb-c to usb-c)? The Philips Evnia gaming monitor has usb-c for input. (42M2N8900)

Will the 4K/120hz limitation still be a problem in that case? Or is it only a problem when using a dongle that converts usb-c into HDMI?

That will work, its only an problem when using HDMI

 

[joevt]

Does anybody know if 4K 120hz works if you connect directly through USB-C (usb-c to usb-c)? The Philips Evnia gaming monitor has usb-c for input. (42M2N8900)

Will the 4K/120hz limitation still be a problem in that case? Or is it only a problem when using a dongle that converts usb-c into HDMI?

It should work as long as it's not using the USB-C connection to also support USB 3.x.

 

[legusta]

Hi.

I was able to get 4k 120hz (Moshou C-006 modded V6100 Cable, M1 Pro 16GB, 14.0, LG OLED 42.)
Today, I updated to Sonoma 14.1, now I can't get 120hz anymore (the option is still there, but my TV doesn't show anything).

Anyone else?

EDIT: I Had to do all the EDID steps again and it worked.

 

[Rozzemak]

After updating to Sonoma 14.1 from 14.0, I lost HDR option at 120hz. 100hz still works.
I cannot even force it with better display.

7100, lg C2, RGB, tried to edit my own EDID.
HDR is not visible in HiDPI mode if set to 120.

Sonoma 14.0 worked fine, as all ventura versions.

Edit:
2540x1440 120 HiDPI does not have HDR option
2304x1296 120 HiDPI does have HDR option. -> produces 10b RGB, no chroma.

Since its scaled 4k image, I will use it, but it produces slightly more blurred text, or my mind is playing tricks on me. Cant really tell.
But the "slightly" bigger ui is not welcome.

Anyone knows how to fix this ? I can provide any log.

 

[DavesMac]

@Vlad123x did you ever solve this problem? I'm trying the hammerspoon script that was shared but it doesn't seem to be totally working if in clamshell mode

Seem to be having same issue waking it up from sleep.. have you found a solution yet? Kinda annoying to replug to wake up from sleep.

 

[iKnowMyABGz]

So my apple studio wont go over 60hz no matter what "adapter," Needs to be a straight cord only. Otherwise 60/75 tops will only be the outcome. HDMI-HDMI is limited (I found out) and was wondering why I never could change my crap past 60 when it does 240. Anyways long story short I got a DP-HDMI and that doubled the HZ instantly. And a little messing around I got 240 but not at 5120 res lol...So went back to my 5120 res and 120hz since screen is 49"

 

[Zorast]

After updating to Sonoma 14.1 from 14.0, I lost HDR option at 120hz. 100hz still works.
I cannot even force it with better display.

7100, lg C2, RGB, tried to edit my own EDID.
HDR is not visible in HiDPI mode if set to 120.

Sonoma 14.0 worked fine, as all ventura versions.

Edit:
2540x1440 120 HiDPI does not have HDR option
2304x1296 120 HiDPI does have HDR option. -> produces 10b RGB, no chroma.

Since its scaled 4k image, I will use it, but it produces slightly more blurred text, or my mind is playing tricks on me. Cant really tell.
But the "slightly" bigger ui is not welcome.

Anyone knows how to fix this ? I can provide any log.

I can confirm, when HiDPI 4k@120hz is enabled HDR is gone since 14.1 !! Plz make also a bugreport on apple feedback assistant app. I will also contact CM support about this.

But i think this is an Apple bug.

I will update the OP with an warning to not update or use 14.1 till we know what's going on.

@stevemr123 @joevt hopefully u guys can help also with some informations?

 

[Rozzemak]

120hz HDR 10bit is still possible, but you have to change resolutions many times from 4k and back and turn off/on hdr many times, until it just inexplicably works.
I just came back from work and my display was set to 422 chroma . It took some fiddling back and forth to get it working as before. Definitely needs attention.

 

[sebapawlak]

I bought UNITEK USB-C to HDMI 8K cable (VMM7100 based). Flashed it (via Parallels) no errors as according to the guide and now all I'm getting is No Signal on the TV and the macbook is not recognizing the display. How can I toubleshoot this?

 

[ekwipt]

Do you think this bug will be fixed on the new Macbook Pro M3s?

 

[Pressure]

Do you think this bug will be fixed on the new Macbook Pro M3s?

They come with a physical HDMI port that can output 4K 120Hz.

 

[KRBM]

They come with a physical HDMI port that can output 4K 120Hz.

Source? Edit: here.

I wonder if the USB-C port also allows 4K 120Hz.

 

[Zorast]

Source? Edit: here.

I wonder if the USB-C port also allows 4K 120Hz.

the limitation is only usbc-c>HDMI when use an USBC Monitor it will work also on an M1

 

[Alcyoneous]

Seem to be having same issue waking it up from sleep.. have you found a solution yet? Kinda annoying to replug to wake up from sleep.

Not really, but after restoring and re-flashing a few times, it is working a bit better, now 3/10 times waking up from sleep don't need an unplug! I've tried turning on the TV first, waiting until it shows no signal, and then waking up my mac, but it doesn't really change anything. I'm currently emailing CableMatters about this, so we shall see what they say...

 

[ekwipt]

They come with a physical HDMI port that can output 4K 120Hz.

with HDR on though?

 

[Zorast]

with HDR on though?

Its an HDMI 2.1 Port!

 

[psyguy]

I bought the Cable Matters 201310 USB-C Multiport adapter since their website showed it as 4k 120hz being supported with a VM7100 firmware update. The articles said to contact them for the firmware (which I did), but while waiting, I figured it might be the same as the one shared here, and I even made a backup just in case.

Unfortunately, it looks like it bricked it. HDMI no longer outputs and it's not detected by vmmHIDtool, updater, dp, neither on my Windows machine or in Parallels (though it never was to begin with even though it output video). I can't rollback.

Seems like it thinks the HDMI is now a 3rd USB port. If you connect a charger, it will shut down your Windows laptop screen and send the fans screaming, forcing a restart. On Mac, just plugged in by itself, it eventually caused a kernel panic shutdown, I presume, twice. Error: SOCD report detected: (AP watchdog expired)

Just bought this Mac 2 months ago, and was about to regret not getting AppleCare last week... I'm going to wait for that firmware...Hopefully figure out if I can unbrick it or have to buy another one altogether. 💩

 

[joevt]

I bought the Cable Matters 201310 USB-C Multiport adapter since their website showed it as 4k 120hz being supported with a VM7100 firmware update. The articles said to contact them for the firmware (which I did), but while waiting, I figured it might be the same as the one shared here, and I even made a backup just in case.

Unfortunately, it looks like it bricked it. HDMI no longer outputs and it's not detected by vmmHIDtool, updater, dp, neither on my Windows machine or in Parallels (though it never was to begin with even though it output video). I can't rollback.

Seems like it thinks the HDMI is now a 3rd USB port. If you connect a charger, it will shut down your Windows laptop screen and send the fans screaming, forcing a restart. On Mac, just plugged in by itself, it eventually caused a kernel panic shutdown, I presume, twice. Error: SOCD report detected: (AP watchdog expired)

Just bought this Mac 2 months ago, and was about to regret not getting AppleCare last week... I'm going to wait for that firmware...Hopefully figure out if I can unbrick it or have to buy another one altogether. 💩

But that's a USB-C dock that supports USB 3.x so it's only getting 2 lanes of HBR3. I suppose if DSC is working, then that's enough for 4K120 if it's using CVT-RB timing instead of HDMI timing. 4:2:0 8bpc is another possibility (but again - not for HDMI timing).

 

[psyguy]

But that's a USB-C dock that supports USB 3.x so it's only getting 2 lanes of HBR3. I suppose if DSC is working, then that's enough for 4K120 if it's using CVT-RB timing instead of HDMI timing. 4:2:0 8bpc is another possibility (but again - not for HDMI timing).

Thank you. When I bought it, I misread the USB 3 ports as being 2.0. Even when it was doing 4K 60hz, the color space was garbage. That explains it!