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Radeon FreeSync Video Mode Optimization Updated For The AMDGPU Linux Driver

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  • Radeon FreeSync Video Mode Optimization Updated For The AMDGPU Linux Driver

    Phoronix: Radeon FreeSync Video Mode Optimization Updated For The AMDGPU Linux Driver

    Last month we wrote about AMD engineers working on an experimental video mode optimization for FreeSync with the open-source AMDGPU Linux kernel driver. With AMD staff getting back to work following the holidays, an updated patch set was submitted today...

    http://www.phoronix.com/scan.php?pag...ptimization-21

  • #2
    IANAL, but HDMI VRR (and HDMI 2.1 in general) in open source are at the mercy of the HDMI Forum.

    https://wiki.x.org/wiki/BoardOfDirec...es/2020/10-22/

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    • #3
      Assuming that the FreeSync range of the monitor is 40-60 Hz, does this mean that playing a 25, 29.97 or 30 FPS video in Chrome/Firefox will automatically select 50 Hz, 59.94 Hz or 60 Hz FreeSync synchronization rates while the video is playing (A) in fullscreen and (B) not in fullscreen?

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      • #4
        Originally posted by agd5f View Post
        IANAL, but HDMI VRR (and HDMI 2.1 in general) in open source are at the mercy of the HDMI Forum.

        https://wiki.x.org/wiki/BoardOfDirec...es/2020/10-22/
        I wouldn't expect anything good from HDMI cartel. They only exist to collect patents. Everyone would have been using DisplayPort already, if not for the cartel controlling TV industry and stuffing HDMI there without any other option.

        If you need to deal with HDMI input on a screen, just get a DP to HDMI convertor.
        Last edited by shmerl; 04 January 2021, 06:48 PM.

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        • #5
          Originally posted by agd5f View Post
          IANAL, but HDMI VRR (and HDMI 2.1 in general) in open source are at the mercy of the HDMI Forum.

          https://wiki.x.org/wiki/BoardOfDirec...es/2020/10-22/
          Hmmm happened to miss that X.Org meeting notes, thanks.
          Michael Larabel
          http://www.michaellarabel.com/

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          • #6
            Originally posted by atomsymbol View Post
            Assuming that the FreeSync range of the monitor is 40-60 Hz, does this mean that playing a 25, 29.97 or 30 FPS video in Chrome/Firefox will automatically select 50 Hz, 59.94 Hz or 60 Hz FreeSync synchronization rates while the video is playing (A) in fullscreen and (B) not in fullscreen?
            No, afaik browsers don't do modesetting, wouldn't select 50 Hz for a 25 fps video but 25 Hz except if browser vendors additionally implemented frame duplication, and this very likely wouldn't work in anything other than fullscreen anyway.
            Not sure on the last point. On Windows, per-window variable refresh rate is possible but since the driver has to stitch all the windows together, the result is not better than running a video player like mpv that properly resamples to the monitor/desktop's refresh rate.

            And as with the previous news and forum thread about this, unless you are a purist that loves judder just use resampling with interpolation to additionally smoothen motion in mpv. mpv also plays youtube videos through youtube-dl.

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            • #7
              How hard can it be for AMD to create a snap or flatpak to change these settings in a nice GUI? I'm not saying they should port the whole Adrenalin software but come on... it's 2021...

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              • #8
                Originally posted by xnor View Post
                And as with the previous news and forum thread about this, unless you are a purist that loves judder just use resampling with interpolation to additionally smoothen motion in mpv. mpv also plays youtube videos through youtube-dl.
                Yeah folks just use mpv for youtube because that's very practical and handy, in case you're one of those grumpy assholes who thinks it's not nearly enough you can also use youtube-browse, youtube-comments, youtube-subscriptions and finally youtube-replace-my-web-browser.

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                • #9
                  The whole HDMI 2.1 situation is a real pity, and would unfortunately make nVidia's binary blob the superior solution for Linux HTPC users moving forward - yet again...

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                  • #10
                    Hmmm, Been using a FreeSync monitor for linux gaming for months now. I've not seen any screen tearing since. As far as I know FreeSync was supported on DisplayPort only.

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