DisplayPort 2.1b Arriving This Spring With DP80LL Cables

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  • BlueCrayon
    Junior Member
    • Dec 2020
    • 27

    #11
    Originally posted by caligula View Post
    My receiver or TV only supports stereo and compressed 5.1 via HDMI ARC.
    Because ARC is just SPDIF over a single pin on the plug. eARC is what you want - it will pass HD Audio over the ethernet pins (but compatibility is iffy with some TV+Receiver combos, most notably Samsung)

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    • dragorth
      Senior Member
      • Jan 2014
      • 537

      #12
      Originally posted by skeevy420 View Post

      What are the important features of DisplayPort 2.1?
      • DisplayPort 2.1 enables up to 3X increase in video bandwidth performance (max payload of 77.37 Gbps)
        • Maximum link rate to up to 20 Gbps/lane and features more efficient 128b/132b channel coding, delivering a maximum payload of 77.37 Gbps
        • First standard to support 8K resolution (7680 x 4320) at 60 Hz refresh rate with full-color 4:4:4 resolution, including with 30 bits per pixel (bpp) for HDR-10 support
      • Beyond 8K resolutions: Example Configurations:
        • Single display resolutionsOne 16K (15360×8460) display 60Hz and 30 bpp 4:4:4 HDR (with DSC)
          One 10K (10240×4320) display 60Hz and 24 bpp 4:4:4 (no compression)
        • Dual display resolutionsTwo 8K (7680×4320) displays @120Hz and 30 bpp 4:4:4 HDR (with DSC)
          Two 4K (3840×2160) displays 144Hz and 24 bpp 4:4:4 (no compression)
        • Triple display resolutionsThree 10K (10240×4320) displays 60Hz and 30 bpp 4:4:4 HDR (with DSC)
          Three 4K (3840×2160) displays @90Hz and 30 bpp 4:4:4 HDR (no compression)
        • When using only two lanes on the USB-C connector via DP Alt Mode to allow for simultaneous SuperSpeed USB data and video, DP 2.0 can enable such configurations as:Three 4K (3840×2160) displays 144Hz and 30 bpp 4:4:4 HDR (with DSC)
          Two 4Kx4K (4096×4096) displays (for AR/VR headsets) @120Hz and 30 bpp 4:4:4 HDR (with DSC)
          Three QHD (2560×1440) @120Hz and 24 bpp 4:4:4 (no compression)
          One 8K (7680×4320) display @30Hz and 30 bpp 4:4:4 HDR (no compression)
      They talk about 4K600 and 8K120 on their main page.
      Anyone know why the example for dual display are two 8K displays, but for triple display it is 10K? Did they get those backwards, or am I expecting maximums and that isn't what they gave us?

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      • shmerl
        Senior Member
        • Dec 2009
        • 3510

        #13
        When will we start hitting limitations of copper cables and switch to fiber optics for displays? It should allow longer distance cables easier too, right?

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        • You-
          Senior Member
          • Aug 2010
          • 1148

          #14
          Originally posted by dragorth View Post

          Anyone know why the example for dual display are two 8K displays, but for triple display it is 10K? Did they get those backwards, or am I expecting maximums and that isn't what they gave us?
          Dual 8K at 120hz. Which would be the same or similar to 48k displays at 60hz.

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          • pWe00Iri3e7Z9lHOX2Qx
            Senior Member
            • Jul 2020
            • 1577

            #15
            The new longer cables are active so they'll be a lot more expensive, but any options are still appreciated. USB4 and TB4 cable length limits can be a pain.

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            • shmerl
              Senior Member
              • Dec 2009
              • 3510

              #16
              Originally posted by pWe00Iri3e7Z9lHOX2Qx View Post
              The new longer cables are active so they'll be a lot more expensive, but any options are still appreciated. USB4 and TB4 cable length limits can be a pain.
              Switching to fiber optics and putting transceivers inside devices would allow using cheaper passive cables.

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              • Alexmitter
                Senior Member
                • Mar 2019
                • 1128

                #17
                Originally posted by Old Grouch View Post

                As far as television is concerned, improving the resolution is less important than improving the frame rate. The limit of the acuity of the human eye has (effectively) been reached: the limit of the human visual system to perceive problems with the display of moving objects (both high-speed linear, and rotational) has not been reached.

                To quote: NABAmplify: Your Eyes vs. Frame Rates: What You Can (and Can’t) See



                The human visual system does not have a 'frame rate' as such - it does not work like a digital video camera, or a traditional film camera with a 25 fps shutter, but it is sensitive to the discrepancies between projecting an image of moving objects at a certain frame rate and 'smooth' reality. Increasing the display frame rate reduces those discrepencies, but as the example shows, artificially contrived (pathological) situations can be generated that expose the limitations of frame-based displays.

                Note that this is not related to the lower limit of about 10 frames per second needed for images to generate perceived 'apparent motion'.
                While its true that framerate is lacking, its a known fact that higher than 30FPS(yea not quite that but for practical means lets call it that) feels really weird for cinema. So the only market this could really benefit is gaming and maybe regular TV but the benefits are complicated and often not actually there.

                Answer: Context. Films are frequently meant to take you away from a real experience. They are dreamy. Fantastical. Beautiful (or ugly). They are, again frequently, meant to be an elevated sense of reality. Films are passively experienced. You aren’t meant to feel like you are a participant. Vid...

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                • Noitatsidem
                  Phoronix Member
                  • Sep 2015
                  • 118

                  #18
                  Originally posted by Alexmitter View Post

                  While its true that framerate is lacking, its a known fact that higher than 30FPS(yea not quite that but for practical means lets call it that) feels really weird for cinema. So the only market this could really benefit is gaming and maybe regular TV but the benefits are complicated and often not actually there.

                  https://www.quora.com/Why-does-60fps...in-video-games
                  you people are why we'll never have smooth motion in movies & they'll forever be a slideshow.

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                  • the-burrito-triangle
                    Phoronix Member
                    • Jul 2024
                    • 80

                    #19
                    The story so far (before these new revisions):
                    Code:
                    --- DISPLAYPORT ---
                    Version               | DSC  | HDCP | USB-C DP Alt-mode & TB Port/Cables
                    1.1  RBR       (5.18) | --   | 1.3  |
                         HBR       (8.64) |      |      |
                    1.2  HBR2     (17.28) | --   |      | TB3 (Alpine Ridge) port, TB3 20Gbps cable
                    1.3  HBR3     (25.92) | --   | 2.2  | DP8K cable
                    1.4                   | 1.2  |      | TB3 (Titan Ridge)  port, TB3 40Gbps cable
                    1.4a                  | 1.2a |      | TB4  port/cable, TB3 40Gbps cable
                    2.0  UHBR10   (38.69) |      |      | DP40 cable / DP8K cable
                         UHBR13.5 (52.22) |      |      | DP54 cable
                         UHBR20   (77.37) |      |      | DP80 cable
                    2.1                   |      |      | TB5  port/cable
                    --- HDMI (High Definition Multimedia Interface) ---
                    Version               | DSC |
                    1.0  SD       (3.96)  | --  |
                    1.1                   | --  |
                    1.2                   | --  |
                    1.3  HS       (8.16)  | --  |
                    1.4                   | --  |
                    2.0  PHS      (14.4)  | --  |
                    2.1  UHS      (42.0)  | 1.2 |
                    HDMI was ahead with UHS, but UHBR matched/exceeded it with DP 2.0. And now HDMI leapfrogs DP again... The circle-jerk of one-up-manship continues. Historically, though, DP was always higher bandwidth than HDMI. But they got fat and lazy, and here we are: HDMI is somehow faster.

                    Also, fun fact: DP cables don't have "versions" like HDMI (pre-UHS), they have certifications (e.g., DP8K for HBR3, DP40/DP8k* for UHBR10, DP54 for UHBR13.5 and DP80 for UHBR20). I believe all DP cables (that weren't rated for RBR) are all capable of HBR2 operation. HBR3 and above you'll have to check the displayport website first to make sure the cable was tested and certified to work at a given bitrate (if no logo is shown on the cable / datasheet).

                    If it ain't on that list, don't buy it.

                    *DP8K certification also qualifies for UHBR10 support--according to VESA (but I can't find the press article stating this...).
                    Last edited by the-burrito-triangle; 07 January 2025, 03:54 AM.

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                    • the-burrito-triangle
                      Phoronix Member
                      • Jul 2024
                      • 80

                      #20
                      For historical context, here's the required DP and HDMI versions for needed for 4k monitor support:
                      Code:
                      1x 4k  8bpc  60Hz: 12.54 | DP 1.2 (HBR2)                         | HDMI 2.0
                      1x 4k 10bpc  60Hz: 15.68 | DP 1.2 (HBR2) or DP 1.4 for HDR       | HDMI 2.1
                      1x 4k  8bpc 120Hz: 25.82 | DP 1.4 (HBR3)                         | HDMI 2.1
                      1x 4k 10bpc 120Hz: 32.27 | DP 2.1 (UHBR10)   or DP 1.4a with DSC | HDMI 2.1
                      1x 4k  8bpc 144Hz: 31.35 | DP 2.1 (UHBR10)   or DP 1.4a with DSC | HDMI 2.1
                      1x 4k 10bpc 144Hz: 39.19 | DP 2.1 (UHBR13.5) or DP 1.4a with DSC | HDMI 2.1
                      DP is even more useful when you have monitors that support MST, but each MST hub in the chain needs to support the combined bandwidth of itself and the downstream monitors.
                      Last edited by the-burrito-triangle; 07 January 2025, 04:06 AM.

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