I'm getting seemingly random dropped frames with my Valve Index + Vega 64 setup, which happens with the AMD drivers in 20.10.1 but doesn’t happen with 20.4.2
They can happen even in the empty Steam loading screen, with nothing happening (standing there, not loading a game, just moving my head around). In that case I'll be at 90hz with a frame time of ~11ms. The typical time my system will delivering a frame in will be 1ms, so loads of headroom in theory.
Everything will be buttery smooth, except every 10 seconds or so (but the actual period is random) it will drop a frame or two and stutter. I'll be able to see the dropped frame(s) on the Steam frame timing graph and also in fpsVR.
If I sit in the empty Steam loading screen, I can pretty much guarantee a frame drop if I just move the HMD so it shows or hides the chaperon barrier. At this point the GPU/CPU are very lightly loaded.
I had been on 20.4.2 from back in April 2020, I updated to 20.10.1 in October and found this frame drop problem.
I've spoken to Steam support about it and tried various suggested fixes which didn't work. They have said it is an issue for AMD to address.
For the moment I’ve rolled back to 20.4.2, but it would be nice to get onto a recent driver again at some point.
Has anyone else seen this problem ?
