The same problems. Let me add details:
* Sound increases and decreases 2-3 times per second
* It's reproduced with "Analog Surround 5.1 output" setting in Phonon (System
Settings -> Multimedia -> Phonon
* It's NOT reproduced with "Analog Stereo Output"
* Sound card is shown as "Built-in Audio" in Phonon
Output of aplay -L
default
Playback/recording through the PulseAudio sound server
sysdefault:CARD=CK804
NVidia CK804, NVidia CK804
Default Audio Device
front:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
Front speakers
surround40:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
4.0 Surround output to Front and Rear speakers
surround41:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804 - IEC958
IEC958 (S/PDIF) Digital Audio Output
dmix:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
Direct sample mixing device
dmix:CARD=CK804,DEV=2
NVidia CK804, NVidia CK804 - IEC958
Direct sample mixing device
dsnoop:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
Direct sample snooping device
dsnoop:CARD=CK804,DEV=2
NVidia CK804, NVidia CK804 - IEC958
Direct sample snooping device
hw:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
Direct hardware device without any conversions
hw:CARD=CK804,DEV=2
NVidia CK804, NVidia CK804 - IEC958
Direct hardware device without any conversions
plughw:CARD=CK804,DEV=0
NVidia CK804, NVidia CK804
Hardware device with all software conversions
plughw:CARD=CK804,DEV=2
NVidia CK804, NVidia CK804 - IEC958
Hardware device with all software conversions
Feel free to contact me if you need additional info to reproduce this
issue
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https://bugs.launchpad.net/bugs/1066062
Title:
[quantal] Sound volume changes without user interaction
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