<kaazoo>
That also mentions a workaround for the latest Steam update (found in /r/AsahiLinux on Reddit).
<kaazoo>
There are mesa packages at https://launchpad.net/~kaazoo/+archive/ubuntu/ubuntu-asahi-gaming/+packages for i386, amd64 and arm64. For i386 I had to disable RustICL. In general, I had to disable the broadcom Vulkan driver, because its config file under /usr/share/vulkan/icd.d/ was causing Vulkan initialization to fail.