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Cake day: June 12th, 2023

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  • Vik@lemmy.worldtoLinux@lemmy.mlQuestion about VRR
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    9 days ago

    No prob, really sorry about the situation though, I know it sucks. I’ve been looking into replacing my TVs with large PC displays with DisplayPort.

    I’m not sure if you can somehow work around the HDMI forum limitation with an active converter, but I think they’re intended to be used at the adapter side (convert HDMI output to DP).




  • Oh sorry, I misunderstood, so you actually get locked into a low mclk under specific display configurations? I’ve genuinely never heard of or personally experienced that across a breadth of hw and sw configs.

    I’m wondering if it could be worth probing the power play sysfs interface or hwmon the next time this happens to try and understand what’s happening there.

    Do you use client apps to interact with tuning settings like LACT? Can you link me to an existing bug report so I can follow up with engineering?


  • Can you elaborate on your display config?

    You kind of alluded to part of it there; it’s not so much a bug in sw/fw as it is a hardware limitation at both the adapter and display side. The variables for displays are vertical blanking intervals (and differences between panels), as well as total display bandwidth.

    with RDNA2, a feature was implemented in DAL to leverage VRR in order to allow a single connected display system to achieve a lower mclk, and thus lower idle power draw. With RDNA3, hardware changes (MALL specifically) broadened this capability two concurrent displays. Even then, it’s not bulletproof.

    The display eng team has more or less exhaustively worked towards this over the course of RDNA3’s lifespan; their work is applicable to both Windows and Linux.






  • how is it a sub par GPU given it targets a specific segment (looking at it’s price point, die area, memory & power envelope) with its configuration?

    You’re upset that they didn’t aim for a halo GPU and I can understand that, but how does this completely rule out a mid to high end offering from them?

    the 9000 series is reminiscent of nv10 versus vega10 GPUs like the 56, 64, even the Radeon 7; achieving equivalent performance for less power and hardware.