Public bug reported:
When I connect my stereo equipment with my computer, audio plays just
fine, but sound coming from the left speaker gets distorted. Notice that
the sound coming from right-speaker sounds just fine. I'm using
integrated s/pdif-outlet to connect to my stereo.
Motherboard I'm using is ASUS M2N32-SLI Deluxe and it has an integrated
s/pdif-outlet, which is controlled by AD1988B HD Audio CODEC. This
device (AD198x) has also some audio volume issues with alsa, but that's
another bug report.
WORKAROUND:
I also noticed, while I was trying to figure out if this even was a bug, that
after I ran "cat /dev/dsp" and "ctrl+c" the sound became undistorted.
SOME INFORMATION:
Release 7.10 (gutsy)
linux-image-2.6.22-14-generic
alsa-base 1.0.14-1ubuntu2
> aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: AD198x Analog [AD198x Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 1: AD198x Digital [AD198x Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
** Affects: ubuntu
Importance: Undecided
Status: New
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Distortion in left channel audio, when using SPDIF I/O port
https://bugs.launchpad.net/bugs/172946
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