I thought I would share that I got the Apple on-board sound working correctly on this system after some moderate futzing around, with these settings, and no additional parts needed:
$ cat /etc/modules # /etc/modules: kernel modules to load at boot time. # # This file contains the names of kernel modules that should be loaded # at boot time, one per line. Lines beginning with "#" are ignored. snd-aoa snd_aoa_soundbus snd_aoa_i2sbus snd-aoa-fabric-layout snd_aoa_codec_tas —— With that, and some time in alsamixer and lxde’s “Volume Control” to make sure things were at appropriate volume levels and not muted, it all works great, and Norah Jones sounds just as great as always, coming out the speakers on the G5. So that is pretty much 100% of everything now on that Dual G5 running debian 11 and all parts up to date. Really really working good. I have installed a bunch of different desktop managers to try them out. For me, lxde remains the smoothest to use. xfce has stuttery menus when I use them, and mate works but is a bit sluggish compared to lxde. Luckily it is so easy to switch between them that trying out various ones is no problem. I have another G5, a Pismo, and a Dual G4 MDD to work on next. Goodness knows how much an SSD would help these out — made a huge difference to my MacBook 2,1, so perhaps that will be down the road next. Thanks Adrian and all for all your work. This works very nicely! Ken