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  • AMD Shows Off An External FreeSync Monitor In Action

    Phoronix: AMD Shows Off An External FreeSync Monitor In Action

    This week at Computex Taipei, AMD is showing off a FreeSync external display in action as their alternative to NVIDIA's G-Sync...

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

  • #2
    Originally posted by phoronix View Post
    Phoronix: AMD Shows Off An External FreeSync Monitor In Action

    This week at Computex Taipei, AMD is showing off a FreeSync external display in action as their alternative to NVIDIA's G-Sync...

    http://www.phoronix.com/vr.php?view=MTcxMjQ
    I have a couple of crucial questions. Can low persistence mode work at the same time as freesync and 3D (on high refresh rate monitors)? Why only 40-60Hz? Will there be freesync+gsync monitors available (since I doubt nvidia will implement freesync at this point)? When will freesync/gsync work on linux?

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    • #3
      Adaptive-Sync and G-Sync monitors can also potentially do 3D, but not at the same time with the current hardware on the market. This is because the strobed backlight in variable refresh displays is incompatible with shutter glasses technology.

      40-60 Hz refresh rate range is used because that is what the monitor's hardware supports. Keep in mind that it is just a demo using a "normal" monitor with modified firmware. The Adaptive-Sync standard itself includes 36-240Hz, 21-144Hz, 17-120Hz and 9-60Hz refresh rate ranges.

      NVidia has full control over the G-Sync hardware in the monitors, and they have not announced plans to support Adaptive-Sync in any way. Without NVidia support, there can be no monitors which work with both technologies.

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      • #4
        LOL - I was like "oh that still tears like hell" ...

        until I realized it is actual my setup that does.

        radeon + awesome wm without compositor.
        I guess there is technically no way to avoid it with this setup?

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        • #5
          Was that also confirmation at the end of the video that the next gen Pirate Islands cards from AMD will be arriving in the next 6-12 months?

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          • #6
            Originally posted by entropy View Post
            LOL - I was like "oh that still tears like hell" ...

            until I realized it is actual my setup that does.

            radeon + awesome wm without compositor.
            I guess there is technically no way to avoid it with this setup?
            DRI3 Should help a little...otherwise just run a minimal compositor.

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            • #7
              Originally posted by entropy View Post
              radeon + awesome wm without compositor.
              I guess there is technically no way to avoid it with this setup?
              Is it important to you not to use a compositor? If not, compton seems quite featureful while still being pretty light. Also, well documented: https://github.com/chjj/compton/wiki/vsync-guide

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              • #8
                Thank you both.

                Originally posted by ChrisXY View Post
                Is it important to you not to use a compositor?
                Nope.

                Originally posted by ChrisXY View Post
                If not, compton seems quite featureful while still being pretty light. Also, well documented: https://github.com/chjj/compton/wiki/vsync-guide
                I'll give that one a try.

                Thanks again!

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                • #9
                  For this to work you will need both a monitor and GPU that support DisplayPort 1.2a, this is the version that makes it part of the core VESA standard. Turns out it has been in the VESA spec for years, but was an optional extension that nobody was using.

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                  • #10
                    Will it work in windowed/“fake fullscreen” mode in games? I'm sadly not sure at all.

                    Do games or layers like SDL need specific code to support this?

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                    • #11
                      Unlike NVIDIA's G-Sync, no specialized hardware is required to support FreeSync. This week at Computex, AMD was showing off the first FreeSync capable monitor
                      Really dude? That's a contradiction right there, you need no specialized hardware except *cough* a FreeSync capable monitor with DisplayPort 1.2a or newer + a card with the same specs (and I assume an AMD card unless Nvidia decide they want to support it too)

                      Standalone monitors as is typically do not support this technology meaning you DO need specialized hardware. You just don't need that expensive GSync chip. I hope Nvidia responds to this by supporting freesync as well.

                      But judging by the differences that GSync is a much more complicated implementation of this, I am sure there are benefits it has that freesync does not (not that I care, I prefer freesync because it's hardly any extra price for me to get that)
                      Last edited by rabcor; 06-06-2014, 02:16 PM.

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                      • #12
                        Originally posted by rabcor View Post
                        Really dude? That's a contradiction right there, you need no specialized hardware except *cough* a FreeSync capable monitor with DisplayPort 1.2a or newer + a card with the same specs (and I assume an AMD card unless Nvidia decide they want to support it too)
                        "No specialized hardware" Means "No hardware who's sole purpose is to make this work." DisplayPort 1.2a capable monitors and cards would have found their way out into customers hands eventually.

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                        • #13
                          Originally posted by Calinou View Post
                          Will it work in windowed/“fake fullscreen” mode in games? I'm sadly not sure at all.

                          Do games or layers like SDL need specific code to support this?
                          I think this will be implemented so that applications don't even have to know its there. It's basically just adaptive vsync except that the PC/GPU triggers the monitor redraw start.

                          Originally posted by Ericg View Post
                          "No specialized hardware" Means "No hardware who's sole purpose is to make this work." DisplayPort 1.2a capable monitors and cards would have found their way out into customers hands eventually.
                          I read somewhere that AMD will support it on all GCN 1.0 and higher GPUs. On the monitor side you need new hardware of course.
                          I wonder if this will help with Oculus, too.

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                          • #14
                            40-60Hz?

                            I think G-sync was meant to go with 120-144Hz monitors, which help with mouse lag.

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                            • #15
                              Originally posted by A Laggy Grunt View Post
                              40-60Hz?

                              I think G-sync was meant to go with 120-144Hz monitors, which help with mouse lag.
                              In the video, the guy mentions that the spec allows for variance from 2-240hz, and the monitor picks a slice out of that and reports it to the GPU as what it supports (for example, 40-60hz). The monitor in the demo is an already released monitor with a special firmware upgrade, so that 20hz variable is probably the best it could do.

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