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4K Tiled Displays Become An Issue With X.Org

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  • 4K Tiled Displays Become An Issue With X.Org

    Phoronix: 4K Tiled Displays Become An Issue With X.Org

    Aaron Plattner of NVIDIA has laid out the latest problem in the X.Org world: how to deal with 4K tiled displays that show themselves to the PC as two displays...

    http://www.phoronix.com/vr.php?view=MTU3NDU

  • #2
    Originally posted by phoronix View Post
    Phoronix: 4K Tiled Displays Become An Issue With X.Org

    Aaron Plattner of NVIDIA has laid out the latest problem in the X.Org world: how to deal with 4K tiled displays that show themselves to the PC as two displays...

    http://www.phoronix.com/vr.php?view=MTU3NDU

    Kind of stupid to have to correct HW design decision in software. At least at this level.

    Comment


    • #3
      tl;dr X.org sucks anyway, does Wayland solve this issue?

      Comment


      • #4
        Are there so many 4K display users (on Linux) that this really needs to be an issue?

        Comment


        • #5
          X.org should treat them as one display so that normal programs functions
          as expected. For programs that would like to use them in a special way,
          information should be provided in a non breaking way.

          Comment


          • #6
            Originally posted by Vistaus View Post
            Are there so many 4K display users (on Linux) that this really needs to be an issue?
            With prices below 1K it will become an issue sooner or later. Or at least it will be one until they start making monitors that behave like a single one.

            Comment


            • #7
              Originally posted by mark45 View Post
              tl;dr X.org sucks anyway, does Wayland solve this issue?
              Thank you for having a strong opinion, but no clue about the subject at hand.

              Treating two separate displays as a single display must be solved in each display server separately.

              Ideally, it would be solved in KMS so it'd just work everywhere, but it'd be non-trivial to configure there in case you wish to keep them separate. The kernel command line isn't really userfriendly.

              Comment


              • #8
                Originally posted by 89c51 View Post
                Kind of stupid to have to correct HW design decision in software. At least at this level.
                The problem is bandwidth. It's also why many 4K displays refresh at 30Hz instead of 60Hz.

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                • #9
                  Originally posted by ctwise View Post
                  The problem is bandwidth. It's also why many 4K displays refresh at 30Hz instead of 60Hz.
                  Then they should have fixed the bandwidth issue before moving ahead with the displays.

                  Comment


                  • #10
                    Originally posted by KellyClowers View Post
                    Then they should have fixed the bandwidth issue before moving ahead with the displays.
                    DisplayPort 1.2 did fix the bandwidth issue. This Dell monitor shows up as two monitors over a single cable when it could easily show up as one monitor over a single cable.

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                    • #11
                      you are not familiar with

                      Originally posted by 89c51 View Post
                      Kind of stupid to have to correct HW design decision in software. At least at this level.
                      You are obviously not familiar with ALSA :P

                      In fact, i dont see why they cant create something like .asoundrc but for Xorg...
                      But it's probably my ignorance.

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                      • #12
                        Originally posted by md1032 View Post
                        DisplayPort 1.2 did fix the bandwidth issue. This Dell monitor shows up as two monitors over a single cable when it could easily show up as one monitor over a single cable.
                        I read that this is because the controllers of the monitor can't handle it as a single one. Maybe a cost related choice but i have no idea TBH.

                        Comment


                        • #13
                          Originally posted by dimko View Post
                          You are obviously not familiar with ALSA :P

                          In fact, i dont see why they cant create something like .asoundrc but for Xorg...
                          But it's probably my ignorance.
                          They did. Xorg.conf. God help you if you ever have to add more than a few lines to it because you're definitely in uncharted territory at that point

                          Comment


                          • #14
                            Originally posted by Ericg View Post
                            They did. Xorg.conf. God help you if you ever have to add more than a few lines to it because you're definitely in uncharted territory at that point
                            *chuckle* X hasn't changed much in the last 4 years since I moved out of AMD.

                            Federated configuration (X.org) helps, but then you have the user based (.config) and driver (amdpcsdb) specific configuration. It's hell...

                            The issue is differentiation. You can either wait for the standard and move en-masse, or you can push forward with a differentiator and deal with the issues... Back in approx 2006 there were two pushing the limits of DVI... Apple's Cinema display would "prefer" low res by the standard, but could do 2560 which was obviously what the user preferred. The other one was the IBM T221 (IIRC) which was dual channel - two connectors, one pane of glass. As they came out they had to partner with the graphics and operating system vendors to get hacks put in place in the presence of these monitors.

                            Realistically, if the path forward is smooth, everyone would be doing it. If you aren't pushing against limits, you aren't pushing hard enough to be calling your self hi-tech or innovative. Unfortunately some markets drag helpless users along too... And Linux is dragged further under foot .

                            Matthew

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                            • #15
                              Originally posted by Vistaus View Post
                              Are there so many 4K display users (on Linux) that this really needs to be an issue?
                              I saw a 39" 4K monitor for $500. It does 30Hz 4k and 120Hz 1080p over HDMI. I expect a lot of dual monitor setups are going to be replaced at those prices.

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