DSC pass-through and other issues

Gaming and Visualization Technologies General Topics and Other SDKs GPU - Hardware
1

I’m working on bringing up a dual-display 2448x2448x90Hz VR system with the Synaptics VXR7200 DP-to-MIPI bridge.

My current problem is that there’s apparently a mismatch between the PPS used by the GPU and by the displays. The bridge is operating in DSC passthrough mode, but it doesn’t seem like that’s working properly.

How do I debug this?

2

Hello @KaneTW2 and welcoem to the NVIDIA developer forums!

Can you specify the apparent mismatch in a bit more detail? For example do you get no signal, only a distorted signal, wrong refresh rate, etc.?
And can you tell us a bit more about the System environment, like which GPU you use, what kind of desktop or server setup, operating system, what application SW is driving the VR output etc.

Thanks!

3

Here’s the symptoms I’m experiencing, depending on various factors that I’m not fully sure:

Variant 1:

  • The VXR7200 deframer correctly detects the frame size. In this case, the VXR7200 sends the correct timings over MIPI and the output image is 4 clearly visible slices (as configured on the display) with distorted data.
    Variant 2:
  • The VXR7200 deframer fails to detect the frame size. In this case the hactive is something like 1024 or 10368 and the image is completely distorted.

I can provide some pictures , but I can’t share any super detailed info in public due to NDA with Synaptics.

4

Oh, the GPU is a RTX A6000 running Windows 10. No particular application, just desktop out.

5

Thanks for the info!

I already reached out to our experts and see if we can help you with this.