Hi. After updating to Sequoia Beta I can't enable 4k 120Hz HDR HiDPI. I can select 4k 120Hz LoDPI HDR or 3424x1926 120Hz HiDPI SDR (3424x1926 is selected after I try to enable HiDPI in BetterDisplay). Reducing the framerate to 60Hz fixes the problem. On Sonoma, everything worked fine. I have CM 201388-A flashed and LG C2 42". Does anybody have the same problem? And is there any solution? I would like to enable 4k or 3424x1926 with 120Hz, HiDPI, and HDR.
Got a tip for us?
Let us know
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
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 !
- Thread starter AironMan
- Start date
- Sort by reaction score
This problem is present since 14.1 . Apple limited this, till now no workaround for that.
I never had this problem on all versions of Sonoma (even after 14.1). Does it occur for all or just for somebody? And I suppose there is no solution yet?
I don't believe in this. Plz confirm that with more informations.
Hi everyone. Really great work on this workaround. However, is it possible to use USB-C -> DP and DP -> HDMI 2.1 adapters to achieve this? As far as I understand, macbooks work fine with displayport and only HDMI transportstream is limited. This would trick macbook to think that it's using displayport and allow more bandwidth. Or no?
Working here with 10bit color and HDR, but iPadOS is limited to 60hz for external displays.
I wanted a KVM solution to switch between my work M3 Macbook and my personal linux workstation. Thanks to this thread, it actually works. One button switches sound, keyboard, mouse, and 4k 120hz hdr video to my LG C2, and everything is stable. Given my previous experience with HDMI adapters and switches, I'm amazed.
Here's everything involved:
Here's everything involved:
- Cable Matters 201310-BLK USB-C hub https://www.amazon.com/dp/B095821QG...0ZQC2PHGE603E4RBJ&starsLeft=1&skipTwisterOG=1
- UGREEN 8K HDMI KVM Switch https://www.amazon.com/dp/B0CFFCPL2...PCDPNBVFS2HVEKNPZ&starsLeft=1&skipTwisterOG=1
- UGREEN USB C Extension Cable https://www.amazon.com/dp/B08NTCD6V...VC29060G4ZDYFSTE6&starsLeft=1&skipTwisterOG=1
- Anker 4-Port USB 3.0 Hub https://www.amazon.com/dp/B07L32B9C...NKQM3ZTX86ECKQ04H&starsLeft=1&skipTwisterOG=1
- USB C to 3.5mm Headphone Adapter https://www.amazon.com/dp/B083LC9WM...cp_ud_dp_X9QF8H1XNGATVT0X0RJR&skipTwisterOG=1 (or use an Apple USB-C to 3.5mm dongle)
- CalDigit DisplayPort 2.0 to HDMI 2.1 https://www.amazon.com/dp/B0BY3SW37..._ud_dp_G9BFRFXE6VZHWN1F7KJJ_1&skipTwisterOG=1 (because my linux machine can't output HDMI 2.1)
Flashed the VMM7100 cable matter usb c to hdmi and it works well until after a few days I cannot select HDR. Not sure what changed. Anybody having the same issue?
Edit: Just realised that changing the UI resolution is what makes it turning off. 1080p and 4k work with her but nothing in between
Edit: Just realised that changing the UI resolution is what makes it turning off. 1080p and 4k work with her but nothing in between
Last edited:
Configuration: Mac Mini M1 with Sonoma 14.6.1 --> Cable Matters reduction (201388-A) with flashed firmware --> ordinary cheap HDMI cable ver. 2.0 --> OLED LG42 C4 and I have 4K 120Hz with HDR??? I have Better Display installed but I don't know if it has anything to do with it.
Attachments
When I connect LG C3 to Macbook with HDMI port directly, when Macbook is in sleep, LG C3 will show "No Signal" and turn off by itself after some time.
But when I connect LG C3 to Macbook through Cable Matters 201310 hub, when Macbook is in sleep, LG C3 still receives signal and shows black screen, it will not let LG C3 turn off by itself after some time.
Is it an issue with my setting?
But when I connect LG C3 to Macbook through Cable Matters 201310 hub, when Macbook is in sleep, LG C3 still receives signal and shows black screen, it will not let LG C3 turn off by itself after some time.
Is it an issue with my setting?
Want to chime in that as of 14.6.1, I'm able to get 4k 120Hz again on Mac mini M2 with cable matters cable and flashed firmware to LG OLED. I don't have Better Display installed.
I'm having trouble getting 2560x1440 @ 120Hz HDR on M3 Max via HDMI—3840x2160 @ 120Hz HDR Works Fine.
At first I thought that there's an HDMI limitation involved but 4K 120Hz HDR works fine.
Lowering the refresh rate to 100Hz on 2560x1440 will show the HDR option.
I'm using a 2.1 HDMI cable with no adapters connected to a C2 OLED.
I'm on 14.6.1
This doesn't make sense to me at all. Am I missing something?
At first I thought that there's an HDMI limitation involved but 4K 120Hz HDR works fine.
Lowering the refresh rate to 100Hz on 2560x1440 will show the HDR option.
I'm using a 2.1 HDMI cable with no adapters connected to a C2 OLED.
I'm on 14.6.1
This doesn't make sense to me at all. Am I missing something?
I found (and its quite some time) how to enforce 4k 4:4:4/RGB & HDR & 120hz via usb-c dp->hdmi on my mbp m1 max after the breaking sonoma update. (LG C2)
It works in sonoma 14.1+ and I just upgraded to sequoia and it STILL works.
I never really figured out what I have to do, so I just fiddle with settings back and forth until I get 4:4:4/RGB 4L10/4L12 10b/12b on my c2.
You have to do this every macos update, but via the usage of better display and config protection, it will stay fixed until next update.
So what to do:
1) Use custom EDID, modified by the tutorial on first page. (I do this, it may no be required for you + I created my own for my C2)
2) Disable all config protections in better display.
3) Turn on HDR on some lower resolution and refresh rate. 1920x1080 100hz hdr works for me.
4) Enable HDR config protection
5) Disable HDR in macos control panel
6) Boom, your tv now should be in 10b/12b 4L10/4L12 // 444/RGB
7) Set your max refresh rate & resolution + enable all config protections - or at least refresh rate, resolution and hdr status.
I'm confident that this method will work on more panels than just LG C2.
PS: Sometimes, it does not really work, and you have to cycle trough resolutions and fiddle with HDR button. But eventually, it will set itself to 444/RGB HDR. Maybe the workaround procedure is not correct, but try to fiddle especially with changing resolution and HDR status in macos control panel while having HDR protection enabled in better display.
It works in sonoma 14.1+ and I just upgraded to sequoia and it STILL works.
I never really figured out what I have to do, so I just fiddle with settings back and forth until I get 4:4:4/RGB 4L10/4L12 10b/12b on my c2.
You have to do this every macos update, but via the usage of better display and config protection, it will stay fixed until next update.
So what to do:
1) Use custom EDID, modified by the tutorial on first page. (I do this, it may no be required for you + I created my own for my C2)
2) Disable all config protections in better display.
3) Turn on HDR on some lower resolution and refresh rate. 1920x1080 100hz hdr works for me.
4) Enable HDR config protection
5) Disable HDR in macos control panel
6) Boom, your tv now should be in 10b/12b 4L10/4L12 // 444/RGB
7) Set your max refresh rate & resolution + enable all config protections - or at least refresh rate, resolution and hdr status.
I'm confident that this method will work on more panels than just LG C2.
PS: Sometimes, it does not really work, and you have to cycle trough resolutions and fiddle with HDR button. But eventually, it will set itself to 444/RGB HDR. Maybe the workaround procedure is not correct, but try to fiddle especially with changing resolution and HDR status in macos control panel while having HDR protection enabled in better display.