Hi folks,
I am experiencing an annoying popping sound from my speakers, driven by the onboard sound on the Asus P8Z68V motherboard. It occurs at random intervals, between 1 and 10 seconds apart. The volume of the pops appears to be independent of the volume settings of any currently playing audio.
I am using Linux Mint 17.
Monitoring the situation, I am getting desktop notifications that the "Volume is muted", followed instantly by "Volume is at X%", where X is whatever I have set it to using the media keys. (I am using "dunst -print" to display the desktop notifications).
I then tried running alsamixer to see if disabling any of the channels would have an effect. While setting the master volume is reliable, if I try to adjust the volume settings for things like the Headphone channel, or PCM/Front/Surround/Center channels, the volume gets reset to 100% at the same time as the notifications (and popping) occurs.
I have already tried disabling power_save in the snd_hda_intel driver, as well as setting the controller to N, but this has had no effect on the popping. The popping also occurs if I am playing a sound, e.g. an MP3 file, which suggests that power save is not the issue, although I may be mistaken.
I also tried enabling kernel even tracing, and got a number of events with varying "power_count" values (1,2,3, never 0), and power_on=1, power_transition=0
Does anyone have any hints on how I can debug this further?
Thanks!
Rogan
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