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OK, I got v39 (public release, not ptc) earlier today on my Q2/rtx3090. Version 39.0.0.88.336.363807235
It did take a while (~20-25 minutes) to download the update, restart, update the headset firmware, then each controller firmware. All seems to work fine in the Quest home. Panels are a little bigger and I can only make them bigger by moving them upward a bit from the dashboard menu. Browser panels are still easy to move and resize though. Clarity seems about the same as v38 (always hoping for improvements, lol!).
I'm using the current v39 PTC on my Oculus Desktop pc app. I've only tested this out with Air Link so far but everything seems to be working fine (including all Q2 refresh rates are showing up).
I did notice that my Air Link dynamic bitrates were down quite a bit. With my rtx3090 I normally use 200mbps Dynamic and when I review my win10 task manager it usually said I was getting about avg 150mbps (varies a bit from 140-160). Now with v39 this results in about avg 100mbps (varies from 90-110).
I did try using 200mbps Fixed and win10 reported about 170-180mbps. Unfortunately this was very unstable. I needed to take this down to 130-140mbps Fixed to get better stability, but I still got the odd stutter. Enabling the new ODT mobile asw afi made this all worse so I've disabled it for now.
I'm just sticking with 200mbps Dynamic for now since this is giving me the most stable, stutter-free results. I don't think there's a lot of difference in clarity/artifacts but maybe not quite as good a v38. Hopefully Meta support can improve v39 with a few more minor updates. Either that, or maybe wait forv40, lol!
Just a quick v39 update since this post;
After playing with a few settings (Oculus Desktop app, ODT, and OTT) I've managed to get my Q2/rtx3090 working much better, with Quest v39 and the Oculus desktop app v39ptc. I also noticed that using Air Link 200mbps dynamic bitrate, and monitoring the win10 task manager over time showed that the bitrate actually increased quite a bit after running apps a little longer. I reviewed a number of different apps/sims now and I can actually see some minor clarity improvements, without any increases in artifacts. All silky smooth and without any stutters. Thank goodness because I thought for a while I was going to have to go back to either Virtual Desktop, or tethered, with a link cable, lol!