iPad Pro 3rd generation iPad Pro can support simultaneous 4K 60 Hz and USB 3.0

[EugW]

Requires a new A2119 dongle, but it appears you can get simultaneous 4K 60 Hz and USB 3.0 speeds out of the 3rd generation USB-C iPad Pro.

https://www.macrumors.com/2019/08/09/apple-new-usb-c-digital-av-multiport-adapter/

In addition, it supports simultaneous USB-C pass-through charging.

https://support.apple.com/en-us/HT207806

 

[AutomaticApple]

Requires a new A2119 dongle, but it appears you can get simultaneous 4K 60 Hz and USB 3.0 speeds out of the 3rd generation USB-C iPad Pro.

https://www.macrumors.com/2019/08/09/apple-new-usb-c-digital-av-multiport-adapter/

In addition, it supports simultaneous USB-C pass-through charging.

https://support.apple.com/en-us/HT207806

Ooooooo! Perfect!

 

[aevan]

Requires a new A2119 dongle, but it appears you can get simultaneous 4K 60 Hz and USB 3.0 speeds out of the 3rd generation USB-C iPad Pro.

https://www.macrumors.com/2019/08/09/apple-new-usb-c-digital-av-multiport-adapter/

In addition, it supports simultaneous USB-C pass-through charging.

https://support.apple.com/en-us/HT207806

While it doesn’t support 4K@60, I believe the old adapter also supports USB 3.0. It certainly supports pass-through (I have it and tried it, not sure about USB 3, though).

Great update anyway.

 

[EugW]

While it doesn’t support 4K@60, I believe the old adapter also supports USB 3.0. It certainly supports pass-through (I have it and tried it, not sure about USB 3, though).

Well, that's just it. 4Kp30 is just annoying. 4Kp60 or bust! Third party USB-C adapters can do 4Kp60, but then cannot do USB 3 speeds at the same time.

It would seem this one may have achieved the Holy Grail of 4Kp60 and USB 3 simultaneously over USB-C (not Thunderbolt 3). However, to be clear, so far we can only confirm that 4Kp60 works fine with this adapter on the iPad Pro, but AFAIK nobody has tested USB 3 at the same time.

 

[joevt]

Well, that's just it. 4Kp30 is just annoying. 4Kp60 or bust! Third party USB-C adapters can do 4Kp60, but then cannot do USB 3 speeds at the same time.

It would seem this one may have achieved the Holy Grail of 4Kp60 and USB 3 simultaneously over USB-C (not Thunderbolt 3). However, to be clear, so far we can only confirm that 4Kp60 works fine with this adapter on the iPad Pro, but AFAIK nobody has tested USB 3 at the same time.

Problem is two lane DisplayPort 1.4 has less bandwidth (12.96 Gbps) than HDMI 2.0 (14.4 Gbps). Four lane DisplayPort 1.2 has more bandwidth (17.28 Gbps) than HDMI 2.0. I don't think the adapter makes up for the bandwidth limitation by using DSC (Display Stream Compression)?

Using 8 bpc, RGB or 4:4:4, HDMI 2.0 has a max pixel clock of 600 MHz.

HDMI 2.0 4K 60 Hz timing is usually 594 MHz.

The A2119 is limited to 540 MHz.

You can try reducing the blanking. For example DisplayPort timing for 4K 60Hz is usually 533 MHz. Some HDMI displays don't like that timing.

You can reduce the chroma-sub sampling to 4:2:2 while increasing the color depth to 10 bpc. This increases the max pixel clock of the A2119 to 648 MHz. I guess HDR has to use this mode for 4K 60 Hz even if you're not using this adapter.

If this adapter is not sufficient then search for one that does not include 5 Gbps USB 3.0 which will then allow four lanes of DisplayPort. For example, adapters that use the MCDP2900 chip will have four lanes operating at 5.4 Gbps per lane which gives them 33% more bandwidth than this adapter that uses a chip that has two lanes at 8.1 Gbps.

 

[EugW]

Problem is two lane DisplayPort 1.4 has less bandwidth (12.96 Gbps) than HDMI 2.0 (14.4 Gbps). Four lane DisplayPort 1.2 has more bandwidth (17.28 Gbps) than HDMI 2.0. I don't think the adapter makes up for the bandwidth limitation by using DSC (Display Stream Compression)?

Using 8 bpc, RGB or 4:4:4, HDMI 2.0 has a max pixel clock of 600 MHz.

HDMI 2.0 4K 60 Hz timing is usually 594 MHz.

The A2119 is limited to 540 MHz.

You can try reducing the blanking. For example DisplayPort timing for 4K 60Hz is usually 533 MHz. Some HDMI displays don't like that timing.

You can reduce the chroma-sub sampling to 4:2:2 while increasing the color depth to 10 bpc. This increases the max pixel clock of the A2119 to 648 MHz. I guess HDR has to use this mode for 4K 60 Hz even if you're not using this adapter.

If this adapter is not sufficient then search for one that does not include 5 Gbps USB 3.0 which will then allow four lanes of DisplayPort. For example, adapters that use the MCDP2900 chip will have four lanes operating at 5.4 Gbps per lane which gives them 33% more bandwidth than this adapter that uses a chip that has two lanes at 8.1 Gbps.

If it’s not 10-bit HDR 2160p60 4:4:4 with USB 3 from the iPad Pro, that would suck.

4:2:2 text quality is poor.

 

[joevt]

If it’s not 10-bit HDR 2160p60 4:4:4 with USB 3 from the iPad Pro, that would suck.

4:2:2 text quality is poor.

I think a test image can prove if it's 4:4:4 or not. There's one at
https://www.nvidia.com/en-us/geforc...providing-4k-60hz-with-4-4-4-choma-hdmi-2-0-/

You need to view it at 100% (no HiDPI or Retina or zoom). If you can't find a mode on the iPad that lets you view an image at 100%, then you might need to make a 4K version for the iPad by increasing the image size - just add more pixels to the border.

Actually, I just tried it out on my Mac Mini 2018 on a Dell P2415Q. I set the resolution to 3840x2160 60 Hz. In the test image, the HDMI 2.0 output looks like crap compared to the DisplayPort output, especially the last two lines of text (red on blue and blue on red). When dragging the image down vertically, the text switches appearance every second vertical pixel. The vertical lines in the blue on red and red on blue sections are blurred together. Doesn't the combination of vertical movement flashing and horizontal muddiness mean 4:2:0? I rotated the image 90° and now see horizontal flashing when dragging the image horizontally (not as bad as when moving vertical) and vertical muddiness (+ flashing when dragging vertically). The appearance is perfect when setting the image to 3840x2160 at 30 Hz. So it seems that even my Mac Mini 2018's four lane DisplayPort 1.2 to HDMI 2.0 adapter can't do 4K 60Hz 4:4:4. Maybe macOS is forcing 4:2:2 or 4:2:0 to allow 10 bpc because it shouldn't be necessary for 8 bpc.

In Windows 10, it says I'm getting 3840x2160 59 Hz RGB 8 bpc and the test image is perfect. I can use the Intel UHD Graphics Control Panel to change color to YCbCr which I guess is 4:2:2 because it makes the test image look bad. The Dell has a menu option that shows the Input Color Format changes from RGB to YPbPr. It's strange though because the "Advanced display settings" window in Windows does not show the Color format changing from RGB like it does when I'm using a PC with Nvidia graphics.

Back in macOS, the Dell says YPbPr for both 30 Hz and 60 Hz. 30 Hz must be using 4:4:4 and 60 Hz must be using something less like 4:2:2 (probably 4:2:0 because of the crappiness in both directions). macOS gives no indication that it's not outputting RGB. In System Information.app, it only gives info about the frame buffer (Framebuffer depth: 24-Bit Color (ARGB8888) or 30-Bit Color (ARGB2101010)), which is not the same as the output signal.

 

[EugW]

I think a test image can prove if it's 4:4:4 or not. There's one at
https://www.nvidia.com/en-us/geforc...providing-4k-60hz-with-4-4-4-choma-hdmi-2-0-/

You need to view it at 100% (no HiDPI or Retina or zoom). If you can't find a mode on the iPad that lets you view an image at 100%, then you might need to make a 4K version for the iPad by increasing the image size - just add more pixels to the border.

Actually, I just tried it out on my Mac Mini 2018 on a Dell P2415Q. I set the resolution to 3840x2160 60 Hz. In the test image, the HDMI 2.0 output looks like crap compared to the DisplayPort output, especially the last two lines of text (red on blue and blue on red). When dragging the image down vertically, the text switches appearance every second vertical pixel. The vertical lines in the blue on red and red on blue sections are blurred together. Doesn't the combination of vertical movement flashing and horizontal muddiness mean 4:2:0? I rotated the image 90° and now see horizontal flashing when dragging the image horizontally (not as bad as when moving vertical) and vertical muddiness (+ flashing when dragging vertically). The appearance is perfect when setting the image to 3840x2160 at 30 Hz. So it seems that even my Mac Mini 2018's four lane DisplayPort 1.2 to HDMI 2.0 adapter can't do 4K 60Hz 4:4:4. Maybe macOS is forcing 4:2:2 or 4:2:0 to allow 10 bpc because it shouldn't be necessary for 8 bpc.

In Windows 10, it says I'm getting 3840x2160 59 Hz RGB 8 bpc and the test image is perfect. I can use the Intel UHD Graphics Control Panel to change color to YCbCr which I guess is 4:2:2 because it makes the test image look bad. The Dell has a menu option that shows the Input Color Format changes from RGB to YPbPr. It's strange though because the "Advanced display settings" window in Windows does not show the Color format changing from RGB like it does when I'm using a PC with Nvidia graphics.

Back in macOS, the Dell says YPbPr for both 30 Hz and 60 Hz. 30 Hz must be using 4:4:4 and 60 Hz must be using something less like 4:2:2 (probably 4:2:0 because of the crappiness in both directions). macOS gives no indication that it's not outputting RGB. In System Information.app, it only gives info about the frame buffer (Framebuffer depth: 24-Bit Color (ARGB8888) or 30-Bit Color (ARGB2101010)), which is not the same as the output signal.

For 30 Hz vs 60 Hz, a poor man's way to test this is just to pick up a window and quickly drag it around the screen. At 30 Hz it's much more jumpy than it is at 60 Hz. However, on a Mac, it's pretty easy. Just open up System Information.

I don't have the new Apple A2119 HDMI adapter, but I do have two third party adapters. This is with my 2017 12" MacBook, with Mojave 10.14.5.

2160p30 multi-function hub:

2160p60 dedicated HDMI adapter:

One thing though is that with the p60 adapter, it was locked to 30 Hz until I chose a different resolution and then changed back. Then it allowed 60 Hz. As you can see from the descriptions, 10-bit/30-bit output is supported.

Just showing small fonts is a pretty good indicator of 4:4:4 or not, but I can definitely read the blue lines near the top of that test image and I can also read the blue on red and red on blue lines at the bottom. IOW, with my Cable Matters HDMI adapter, I get 10-bit HDR 2160p60 4:4:4, from a 2017 12" MacBook Core m3-7Y32. Display is a 43" Sony XBR X800E TV.

Also, it should be noted that you need to choose the right input on some displays, since not all displays support 4:4:4 on all their HDMI inputs.

EDIT:

As mentioned below, this is impossible. So perhaps it's 4:2:2 for 10-bit, as its definitely 2160p60.

 

[joevt]

For 30 Hz vs 60 Hz, a poor man's way to test this is just to pick up a window and quickly drag it around the screen. At 30 Hz it's much more jumpy than it is at 60 Hz. However, on a Mac, it's pretty easy. Just open up System Information.

System Information.app might correctly tell you the refresh rate. But the other info for Resolution, UI Looks like, and Framebuffer Depth only describe the frame buffer information. Output resolution and timing can be seen using SwitchResX. I don't know a method to show output color depth (6,8,10,12,16 bits per component) or format (RGB, 4:4:4, 4:2:2, 4:2:0).

I don't have the new Apple A2119 HDMI adapter, but I do have two third party adapters. This is with my 2017 12" MacBook, with Mojave 10.14.5.

2160p30 multi-function hub:

2160p60 dedicated HDMI adapter:

Here's a command that can tell you how many lanes of DisplayPort (1,2,4) and the speed of the lanes (RBR, HBR, HBR2, HBR3) that the adapters support. macOS Nvidia drivers might return less info than the Intel or AMD drivers.

/System/Library/Extensions/AppleGraphicsControl.kext/Contents/MacOS/AGDCDiagnose -a > AGDCDiagnose_a.txt 2>&1

One thing though is that with the p60 adapter, it was locked to 30 Hz until I chose a different resolution and then changed back. Then it allowed 60 Hz. As you can see from the descriptions, 10-bit/30-bit output is supported.

Just showing small fonts is a pretty good indicator of 4:4:4 or not, but I can definitely read the blue lines near the top of that test image and I can also read the blue on red and red on blue lines at the bottom.

Chroma subsampling won't make the text unreadable. It will be slightly blurred because PbPr values aren't sampled for every pixel like the Y luminance values. With chroma subsampling, every pixel can have a different color as before, except in the case where two pixels of different color have the same luminance. Maybe the chroma subsampling test image would be better if the red and blue colors had the same luminance.

https://www.rtings.com/tv/learn/chroma-subsampling
https://imgur.com/gallery/Km3rW
http://colorizer.org

IOW, with my Cable Matters HDMI adapter, I get 10-bit HDR 2160p60 4:4:4, from a 2017 12" MacBook Core m3-7Y32. Display is a 43" Sony XBR X800E TV.

Also, it should be noted that you need to choose the right input on some displays, since not all displays support 4:4:4 on all their HDMI inputs.

I'm not sure which adapter you have. Cable Matters has many. But 10-bit 2160p60 4:4:4 over HDMI 2.0 is impossible. Maximum pixel clock for 30 bit pixels over HDMI 2.0 would be 480 MHz but you need 533 or 594 MHz for 4K60Hz.

The HDMI wikipedia page says 10 bpc requires 4:2:2 at 4K60. It would allow a max pixel clock of 720 MHz. I've attached a spreadsheet to show this.
https://www.rtings.com/tv/discussions/D192tWqJoB1o_3J3/hdr-and-4-4-4-chroma-subsampling

 

[EugW]

System Information.app might correctly tell you the refresh rate. But the other info for Resolution, UI Looks like, and Framebuffer Depth only describe the frame buffer information. Output resolution and timing can be seen using SwitchResX. I don't know a method to show output color depth (6,8,10,12,16 bits per component) or format (RGB, 4:4:4, 4:2:2, 4:2:0).


Here's a command that can tell you how many lanes of DisplayPort (1,2,4) and the speed of the lanes (RBR, HBR, HBR2, HBR3) that the adapters support. macOS Nvidia drivers might return less info than the Intel or AMD drivers.

/System/Library/Extensions/AppleGraphicsControl.kext/Contents/MacOS/AGDCDiagnose -a > AGDCDiagnose_a.txt 2>&1

Chroma subsampling won't make the text unreadable. It will be slightly blurred because PbPr values aren't sampled for every pixel like the Y luminance values. With chroma subsampling, every pixel can have a different color as before, except in the case where two pixels of different color have the same luminance. Maybe the chroma subsampling test image would be better if the red and blue colors had the same luminance.

https://www.rtings.com/tv/learn/chroma-subsampling
https://imgur.com/gallery/Km3rW
http://colorizer.org


I'm not sure which adapter you have. Cable Matters has many. But 10-bit 2160p60 4:4:4 over HDMI 2.0 is impossible. Maximum pixel clock for 30 bit pixels over HDMI 2.0 would be 480 MHz but you need 533 or 594 MHz for 4K60Hz.

The HDMI wikipedia page says 10 bpc requires 4:2:2 at 4K60. It would allow a max pixel clock of 720 MHz. I've attached a spreadsheet to show this.
https://www.rtings.com/tv/discussions/D192tWqJoB1o_3J3/hdr-and-4-4-4-chroma-subsampling

Yes, I had obviously forgotten about that HDMI 2.0 2160p60 bandwidth restriction for 444, and thanks for the re-education. Perhaps in some instances it is automatically switching from 30 Hz 444 to 60 Hz 422 depending upon the source material. That is what my Blu-ray player may do (depending upon the setting). Or perhaps it's just setting it to 422 when I am switching to 2160p60. That would explain why macOS sometimes seems to first default to 2160p30 on some displays until I change the setting, and then it switches to 2160p60. Maybe it's because macOS determines 2160p30 is best because it can provide 444.

Anyhow, this is my LG C8 OLED TV, supported at 2160p60, apparently 10-bit. But then again it says the MacBook’s built-in screen is at 10-bit. It isn’t. Hmmm...

Upon re-evaluation on the LG TV, the test image is not bad enough to be 420, but it's not perfect either. So perhaps it is 422.

BTW, to my surprise the LG TV was automatically overscanning which was making some text look horrible. I had to change the LG TV's settings to prevent overscanning, to "Just Scan: ON", but most people wouldn't know what that means, and would have just left it to "Just Scan" Auto" which overscans by default.

In any case, this is the first part of the output dump from that application, connected to a LG C8 OLED TV (HDMI 2.0).

AGDCDiagnose Version: 3.40.16
## ScanPort - Start ##

[1] IOService:/IOResources/AppleGPUWrangler
Vendor: Apple [0000106b]: AppleGPUWrangler [8 10000] (0)

[2] IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/IGPU@2/AppleIntelFramebufferController/IntelFBClientControl
Vendor: AppleIntelFramebufferController [0000106b]: IntegratedGPU [1 10000] (0)
FBs: 3
Ports: 0xe mst:0xc ddc:0 aux:0xe
Streams: dp:0 dvi:0 mst:2 max:3
FB: 00 : Group: 0 Address[ 1.0], Flags:[online fixed ], Stream:N/A
FB: 01 : Group: 0 Address[ 2.0], Flags:[online associated ], Stream:Enabled
FB: 02 : Group: 0 Address[ 0.0], Flags:[offline ], Stream:N/A
Port: 01 : [DP, 1.1, 4 x HBR] set [4 x HBR : status: 7777] caps [features 0x1000a, p_encoding 0x9] Sink OUI:0-16-250 eDaba [101-68-18-97-98-97] HW Version: 16 FW Version:19.0
Port: 02 : [DP, 1.2, 4 x HBR2] set [4 x HBR2 : status: 7777] caps [features 0x1000a, p_encoding 0x9] DVI/HDMI Branch OUI:0-28-248 176GB0 [49-55-54-71-66-48] HW Version: 16 FW Version:7.85
Port: 03 : empty

As expected on my 2017 MacBook Core m3, it's DisplayPort 1.2, with 4 lanes of HBR2, so 21.6/17.28 Gbps.

Cable Matters 201028: https://www.cablematters.com/pc-893...r-supporting-4k-60hz-with-power-delivery.aspx

It will be interesting to see if/when Apple decides to support HDMI 2.1 on iPad Pros. Some LG TVs already support HDMI 2.1.

 

[joevt]

Anyhow, this is my LG C8 OLED TV, supported at 2160p60, apparently 10-bit. But then again it says the MacBook’s built-in screen is at 10-bit. It isn’t. Hmmm...

I believe the Framebuffer Depth shown by macOS does not represent the output pixel format. I mean, it says 2 bit alpha, but that would be wasted bandwidth to include those 2 bits. It says RGB even though it might be doing 4:2:2 or 4:2:0 YPbPr (as when I tested my Mac Mini 2018's HDMI 2.0 output).

BTW, to my surprise the LG TV was automatically overscanning which was making some text look horrible. I had to change the LG TV's settings to prevent overscanning, to "Just Scan: ON", but most people wouldn't know what that means, and would have just left it to "Just Scan" Auto" which overscans by default.

Every flat panel TV should have a pixel by pixel 1:1 format like that if they're any good.

In any case, this is the first part of the output dump from that application, connected to a LG C8 OLED TV (HDMI 2.0).

As expected on my 2017 MacBook Core m3, it's DisplayPort 1.2, with 4 lanes of HBR2, so 21.6/17.28 Gbps.

I think the EDID in the output might show what kind of chroma subsampling modes are supported by the TV. The DPCD registers in the output might show extended receiver capabilities at address 2200h (if the adapter supports DisplayPort 1.4 features or rates). The OUI you included are:
0-16-250 = Apple, Inc. (the laptop display)
0-28-248 = Parade Technologies, Ltd. which is the maker of the DisplayPort to HDMI chip in the adapter you used. The 176GB0 might point to the ps176.

 

[EugW]

I believe the Framebuffer Depth shown by macOS does not represent the output pixel format. I mean, it says 2 bit alpha, but that would be wasted bandwidth to include those 2 bits. It says RGB even though it might be doing 4:2:2 or 4:2:0 YPbPr (as when I tested my Mac Mini 2018's HDMI 2.0 output).

It turns out that if I'm just using the MacBook alone with nothing attached, System Information indicates it is 8/24-bit. However, if I connect an HDR display, both the external display and the internal display are 10/30-bit.

BTW, Cable Matters recommends a third party application to gain better control of resolutions and refresh rates in Mojave. It is called Retina Display Menu, and I have confirmed it works with both Mojave and the latest Catalina beta.

I think the EDID in the output might show what kind of chroma subsampling modes are supported by the TV. The DPCD registers in the output might show extended receiver capabilities at address 2200h (if the adapter supports DisplayPort 1.4 features or rates). The OUI you included are:
0-16-250 = Apple, Inc. (the laptop display)
0-28-248 = Parade Technologies, Ltd. which is the maker of the DisplayPort to HDMI chip in the adapter you used. The 176GB0 might point to the ps176.

Interesting. I bought that adapter in 2017 (after the new MacBooks came out), and the DP 1.4 standard was only published in 2016. However, that web page states the ps176 is DP 1.4 capable. I will have to try it with a DP 1.4 Mac and a USB-C iPad Pro, but I don't currently have either. I do have a 2017 iMac though, and that apparently may work with 4K 60Hz and USB 3 with the new Apple dongle (but otherwise was always considered DP 1.2).

In the meantime, I have attached the full dump of the AGDCDiagnose results from my MacBook.

 

[EugW]

Heh. Cable Matters sells an 8K compatible USB-C to DisplayPort 1.4 dongle. Model number 201086

https://www.cablematters.com/pc-103...apter-with-8k-resolution-and-hdr-support.aspx

So, what do they use to demonstrate it, while describing its 8K support? A 12" MacBook.

 

[TheRealAlex]

Requires a new A2119 dongle, but it appears you can get simultaneous 4K 60 Hz and USB 3.0 speeds out of the 3rd generation USB-C iPad Pro.

https://www.macrumors.com/2019/08/09/apple-new-usb-c-digital-av-multiport-adapter/

In addition, it supports simultaneous USB-C pass-through charging.

https://support.apple.com/en-us/HT207806

And yet they can’t manage to figure out how to Fill the screen when in desktop mode or just apps always the sides cut off.

Also I’d be impressed with 4K@60Hz with HDR10

 

[joevt]

BTW, Cable Matters recommends a third party application to gain better control of resolutions and refresh rates in Mojave. It is called Retina Display Menu, and I have confirmed it works with both Mojave and the latest Catalina beta.

It looks like RDM hasn't been updated in 3 years. I use SwitchResX. It adds the ability to create custom resolutions and view timing info. Change frame buffer color depth between millions and billions of colors. Grayscale. Underscan slider. It more clearly shows which resolutions are HiDPI. It shows which resolutions are 16:9, 16:10, 4:3 so you can choose ones that match your display. You can hide resolutions or enable a warning for resolutions. You can reassign resolutions. It has other features I don't use like icon rearranging, display sets, etc.

Interesting. I bought that adapter in 2017 (after the new MacBooks came out), and the DP 1.4 standard was only published in 2016. However, that web page states the ps176 is DP 1.4 capable. I will have to try it with a DP 1.4 Mac and a USB-C iPad Pro, but I don't currently have either. I do have a 2017 iMac though, and that apparently may work with 4K 60Hz and USB 3 with the new Apple dongle (but otherwise was always considered DP 1.2).

The ps176 is limited to HBR2 speed (5.4 Gbps per lane) and doesn't use DSC or HDR so using a DP 1.4 Mac or iPad Pro probably won't change anything. It has "Internal YCbCr 4:4:4 /4:2:2 to YCbCr 4:2:0 conversion capability" which means even if you knew the output pixel format from macOS, that might not be the format passed to the HDMI display.

In the meantime, I have attached the full dump of the AGDCDiagnose results from my MacBook.

Thanks. I've attached your EDID info. I used parse-edid and edid-decode compiled on my Mac. parse-edid seems to exist only to output mode lines from EDIDs - and it's missing many newer modes. edid-decode does a good job but I don't know if it extracts everything. You can try moninfo.exe (Monitor Asset Manager) in Windows (won't accept some EDIDs with extra blocks) or AWEDIDEditor.app in macOS (shows random bytes after the single 128 byte block of the Apple EDID; seems to misinterpret something in the LG TV EDID after the Colorimetry block which is the HDR static metadata data block).

Heh. Cable Matters sells an 8K compatible USB-C to DisplayPort 1.4 dongle. Model number 201086
https://www.cablematters.com/pc-103...apter-with-8k-resolution-and-hdr-support.aspx
So, what do they use to demonstrate it, while describing its 8K support? A 12" MacBook.

MacBook has four lane HBR2 which is more bandwidth than HDMI 2.0, so it should be sufficient. I don't think Intel graphics will allow that resolution. I couldn't even make a scaled resolution in SwitchResX. It's strange because macOS creates a 6720 x 3780 scaled resolution automatically, but won't let me create one that's 32 pixels wider and 18 pixels taller.

This adapter probably uses the ps186 which supports up to HBR3, DSC, and HDR. It could be the same chip that Apple uses except Apple's adapter is limited to two lanes to allow 5 Gbps USB.

For HDMI 2.0, 8K is limited to 30Hz (1030 MHz) 4:2:0 8 bpc (there's no DSC to allow for more such as HDR). This is achievable with Apple's new adapter (2 lane HBR3). It doesn't matter in this case that 2 lane HBR 3 has less bandwidth than HDMI 2.0 because the extra bandwidth of HDMI 2.0 doesn't allow the next higher subsampling mode or color depth for this resolution and refresh rate (according to the spreadsheet I posted).

Also I’d be impressed with 4K@60Hz with HDR10

For HDMI 2.0, 4K60Hz HDR10 (594 MHz) can be done with 4:2:2 10 bpc. This is also achievable with Apple's adapter.

Since two lane HBR3 has less bandwidth than HDMI 2.0, there is possibly a case where a resolution / refresh rate / pixel depth / pixel format combination achievable by HDMI 2.0 is not achievable by Apple's adapter. But these last two examples are not one of those cases.

Actually, 8K 30Hz might require 1188 MHz (2 times the 594 MHz of 4K 60Hz HDMI). This is not achievable by the Apple adapter unless you go with 4:2:0 6bpc, 4:1:1 6bpc or 4:1:0 8bpc. All of those might not be selectable options, in which case you'll want the 4 lane HBR2 adapter.
[doublepost=1566193406][/doublepost]Oops, you linked a USB-C to Displayport 1.4 adapter. I was thinking USB-C to HDMI 2.0.

Definitely the MacBook or any Intel graphics Mac will not be able to use the full capability of that USB-C to DisplayPort 1.4 adapter.

USB-C to DisplayPort 1.4 adapter is just a pass through for USB-C DisplayPort alt mode. Can't existing USB-C to DisplayPort adapters do the same thing? Well, maybe not if their quality is not as good. At least this new adapter is tested for HBR3 signal rates (but HBR3 is only 50% faster than HBR2).

 

[EugW]

There is an iOS script that can show the resolution and refresh rate, for both the internal screen and an attached external screen. This is with the Belkin 4K adapter on the 2018 iPad Pro with iOS 12:

https://www.macstories.net/ipad/hands-on-belkins-usb-c-to-hdmi-adapter-for-the-2018-ipad-pro/

10-bit including Dolby Vision is supported:

Now we just need someone to confirm this with simultaneous USB 3 on the new Apple dongle.

 

[max2]

Requires a new A2119 dongle, but it appears you can get simultaneous 4K 60 Hz and USB 3.0 speeds out of the 3rd generation USB-C iPad Pro.

https://www.macrumors.com/2019/08/09/apple-new-usb-c-digital-av-multiport-adapter/

In addition, it supports simultaneous USB-C pass-through charging.

https://support.apple.com/en-us/HT207806

Very nice!

 

[Super Xander]

Do anyone knows an app for iPad Pro, which can talk to my usb-drives and view the files in full resolution on the external display?
Using the dongle so far with the files app, the view is cropped down and not full size like with the photo-app.