Comment 105 for bug 1428121

Hi again,

Just a quick update subsequent to my original comment (see below)

I recently upgraded from Haswell to Skylake (i6700k, Asus Maximus Hero VIII Alpha) and it would appear that I no longer have the HDMI audio issue..

As in:

- I have vt-d enabled in the bios
- My currently booted kernel has iommu=on (verified via 'cat /proc/cmdline')
- The iommu seems to be working (verified via 'dmesg | grep iommu' and 'find /sys/kernel/iommu_groups/ -type l')
- With the above in place, I appear to have working HDMI audio (from the integrated Intel HD 530 graphics)

This would suggest the problem is Haswell specific, since Skylake doesn't appear to be affected?

Thanks,

(In reply to Alza from comment #87)
> Hi there,
>
> I also seem to be affected by this issue (Haswell i7-4790k, Asus Maximus
> Hero VII).
>
> No HDMI Audio from integrated Intel HD 4600 graphics, with intel_iommu=on (I
> need this turned on in order to do GPU passthrough for a discrete Nvidia
> adapter).
>
> There is no audio being output, even though every command I try seems to
> confirm the HDMI audio device is present and 'working'.
>
> Finally, can anyone confirm whether or not Skylake CPU's are also affected
> by this issue, or is the issue limited to Haswell CPU's only?
>
> Thanks,