A note on the Apport submission:
I did a new install of Lucid on my laptop. I enabled auto-login and
installed some other software.
I used system->preferences->sound to change to the digital out/analog in
from the default analog duplex.
I had to then open alsamixer to unmute and raise the volume on the SPDIF
so it actually played sound (this step probably shouldn't be required if
you do the above step of sys->pref->sound==>digital out, but that should
be a different bug report...)
Once I did this, there was no "buzzing", but this essentially replicated
my earlier workaround of "mute/unmute to get rid of buzz". Now when I
restart, any sounds I play will buzz until I do the mute/unmute trick. I
only have to do that once, however, as the driver never enters a
powersave state ("cat /sys/module/snd_hda_intel/parameters/power_save"
yields 0) again. If I enable power saving (a feature that should work)
by changing power_save to be, say, 15, after 15 or so seconds, the
buzzing will return.
If you want me to replicate this on a virgin RC or Beta CD, I can do
that as well. The procedure should go something like:
1) Boot up
2) Sys->Prefs->Sound, change to be digital output instead of analog
3) Run alsamixer in a terminal, up the Master and SPDIF sliders to 100 (0dB),
and unmute SPDIF.
4) Enable power saving mode by setting the power_save variable to something
like 15.
5) Wait 15 or so seconds
6) Play a sound with easily heard distortion, such as the test sinusoid in
gstreamer-properties
Let me know what else you'd like me to do. Afonic, if you could
replicate this for them so we can get a "confirmed," that would be
awesome.
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ALSA SPDIF Digital output clipping / crackling during playback
https://bugs.launchpad.net/bugs/359361
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