Comment 30 for bug 445849
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| mdgill (michaelgill1969) wrote Re: Highpitched Rattling like Sound with 5.1 Surround Configuration on Karmic Koala | #30 |
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f33e652
(Get the code!)
I am using a MacBook 4,1 (aka MacBook Early 2008?). The daemon.conf suggestions don't have any effect. Also, there is only the Master slider in alsamixer output. The "speaker-test -c6" gives six channels, with front and rear, left and right, and center checking out OK (using the left and right speakers in different combos and volumes). However, it does not activate the LFE speaker under the keyboard (or so I have heard that's where it is).
However, gamix fixes the problem if the LFE button is toggled off and on. This seems to work fine, at least for a while. At some point, the audio becomes unstable, which may have been a problem with messing around with daemon.conf. Now that it is set to default, I can report later if instability arises again. For now, gamix appears to fix the LFE. I don't know why.