[alsa-devel] No audio on iMac18,1 (A1418) with kernel 4.15.14

[Freaky]

FYI: Tested all the pin outs with hda-analyzer, didn't get sound on the
speakers with any of them.

On Tue, Apr 10, 2018 at 3:57 PM, Freaky <freaky2000 at gmail.com> wrote:

> Hi there,
>
> we got an iMac18,1 here on which we have no audio.
>
> Maybe the codec is just too new, although I see people using it on
> non-Apple hardware. Using model parameters imac27 or imac27_122 doesn't
> help.
>
> Have alsa-info attached. lspci (on this distro (but it's dated although it
> has a recent kernel)) doesn't recognize it yet, the online PCI-IDs says:
>
> Sunrise Point-LP HD Audio
>
> Found some other people mentioning this issue at Arch, thread is here:
> https://bbs.archlinux.org/viewtopic.php?id=233449&p=2 - no solution so
> far.
>
> Will see if flipping bits with hda-analyzer will make it go.
>
> If there's a solution for this already we'd be much obliged if someone can
> point us to it. Otherwise very willing to help, but can't code drivers
> unfortunately. Can apply patches and build kernels however :). We'll have
> to return the machine in about a week, so if anyone desires
> output/testing/etc. please let us know asap as we only have it available
> for a short while.
>
> Will post the solution, if we can find one, to the Arch thread as well.
>
> Thanks in advance.
>
> Kind regards
>