https://grapheneos.org/install/web
Most users don't have any issues. 2 people reported an occasional Wi-Fi connectivity issue not happening for others. These are brand new releases and more will be ironed out.
quotingThe first update for #GrapheneOS on the Pixel 9, Pixel 9 Pro and Pixel 9 Pro XL is now available. It now has a full port of our hardware-level + software-level USB-C port control feature as a replacement for our legacy USB peripheral control feature: https://grapheneos.org/features#usb-c-port-and-pogo-pins-control.
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Currently, the only known issue with support for 9th generation Pixels is all volume levels above 0% currently acting the same way. We're actively working on this and should have a fix for it available soon. Once that's resolved, we're already close to a production release.
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