I'm still pretty new to linux, but first I would say that since it works again in 27-29, it should someday in the 28 series also. I don't really understand what's the problem with restricted drivers and a mainline kernel since sound and compiz effects worked with no problem when I tried. Maybe you could try to compile your own kernel.
To make sure it gets solved, I would guess we need to also check kernels between 27-14 and 27-19 to know where it was solved and send that info to the kernel team. I don't know if it works that way, I'm just guessing.
I'm still pretty new to linux, but first I would say that since it works again in 27-29, it should someday in the 28 series also. I don't really understand what's the problem with restricted drivers and a mainline kernel since sound and compiz effects worked with no problem when I tried. Maybe you could try to compile your own kernel.
To make sure it gets solved, I would guess we need to also check kernels between 27-14 and 27-19 to know where it was solved and send that info to the kernel team. I don't know if it works that way, I'm just guessing.