At Sun, 23 Mar 2014 17:31:17 +0100, Daniel Martin wrote:

Hi,

I've a bug here: when playing audio via the speakers of a monitor attached to a DisplayPort and I mute the corresponding S/PDIF (i.e. with alsamixer) then the monitor switches off into standby, unmuting the S/PDIF turns the monitor back on. When muting the S/PDIF while no audio is playing everything is fine.

There's no audio daemon running and my ~/.asoundrc contains only:

pcm.!default {
    type hw
    card 0
    device 3
}

I've already filed a fdo bug report (drm/intel) for this as I thought it might be related to it: Bug 75729 - [hsw dp audio] Muting S/PDIF turns off DP https://bugs.freedesktop.org/show_bug.cgi?id=75729 Attached to this bug is a `alsa-info.log` too.

As stated in the bug report it's not a showstopper for me, but obviously something seems to go wrong and maybe someone has an idea.

It's an issue of Haswell graphics side. From the audio POV, it merely turns on/off the IEC958 status bits in the HDMI audio codec.

thanks,

Takashi