Red Hat Bugzilla – Bug 496612
constant whining noise from speakers
Last modified: 2010-06-28 08:06:46 EDT
Not sure if this is actually pulseaudio or something else, but since updating to F-11 (and allowing pulseaudio to remain, having removed it from F-10), I have a near-constant whining noise from the speakers on my laptop -- the speakers are turned on when they should be silent, and amplifying the electrical noise within the laptop.
It's bizarre -- every time I do something like changing the volume (using the hotkeys) or even muting/unmuting the sound, I get a 'click' as if the amplifier is _actually_ being powered down, followed by 5 seconds of real silence before the noise comes back.
If I run the F-10 gnome-volume-control, because nothing I can find in F-11 actually gives me control over the internal speaker amp switch, and I turn _off_ the internal speakers, then trying to play a sound is silent. But still, 5 seconds after 'play' finishes, the noise is back. The speakers seem to be back on again.
Sounds like it is a driver bug.
PA closes the audio device after 5s of idle. If there is a noise, then it is due to some issue in the sound driver.
Reassigning to kernel. Please exlain which driver you have.
snd-hda-intel, realtek codec, mbp4
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.
More information and reason for this action is here:
I can confirm this bug, although for a different sound hardware. I'm using Fedora 11 (final GA), and the random noise is there whenever I do *anything* on the computer - move my mouse, type something, scroll, do alt+tab etc. etc.
It's quite loud and very irritating.
I too have a Realtek AC97 chip (I can spot the following modules: snd_intel8x0, snd_ac97_codec, ac97_bus). This problem was not there for Fedora 10.
The noise goes away only if mute the master channel, and not the PCM.
Okay. Just figured it out. I ran alsamixer -c0 and muted the CD channel, and the noise stopped.
This might be of interest now: I have a TV tuner card (modules saa7134, saa7134_alsa) whose sound output is actually given using a CD audio cable to the sound hardware (built in to the motherboard). I haven't tested the tuner card with F11 yet. Anyway, muting out the CD channel cuts the noise out for me.
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