Netrick:
I noticed what appears to be a similar problem reported on the
Fluidsynth (fluid-dev) e-mail list. I have copied the text from that
e-mail here:
When I start fluidsynth for the first time, after a boot up, or a
log on, fluidsynth sounds fuzzy. And when I quit my application,
which is using alsa as a audio driver, and then start up the
application again, all is fine- normal timbres. Is there a way
around this? Is this a bug?
I am using ubuntu 13.10.
Perhaps it is the same problem.
- Aere
On 02/16/2014 03:57 PM, Netrick wrote:
I found a very strange bug in Lubuntu 13.10. When I open alsamixer and
unmute the microphone and increase its volume, my speakers start to
constantly give some noise. When I enable microphone boost, the noise
gets even louder. When I mute microphone, the noise disappers.
The speaker noise happens with and without microphone plugged. Please
note that this is noise from speakers and has nothing to do with
recording noise. The speaker noise starts just when I boot Lubuntu and
it is present all the time after, even if I'm not logged in (just
sitting on the login screen after boot is enough to hear the noise
which is audible all the time when Lubuntu is working).
I tested it on different PCs with different soundcards - Realtek ALC
892, Audigy 1 Gold, Sound Blaster and the noise appeared on every PC.
The workaround I found is installing PulseAudio and pavucontrol, then
muting microphone in alsamixer and then enabling microphone in
pavucontrol, after that when I use PulseAudio for audio output and
input there is no noise in speakers, so PulseAudio somehow fixes it.
Is it a known bug in ALSA? Maybe it's a bug in how Lubuntu uses ALSA?
Maybe it's a bug in alsamixer and not ALSA? I have no idea where I
should report it. I really want to get it fixed as it is very annoying
in my favourite distro. And I have no clue what and where I should report.
I don't want to use PulseAudio workaround as PulseAudio still has some
outstanding issues in Wine in 2014 and I think the bug in ALSA should
be fixed as Lubuntu is just ALSA-only distro and probably it will stay
that way. And well, ALSA should be reliable with microphone input.
Of course, despite the noise, sound works allright, I can listen to
the music or record using the microphone etc. It's just the noise is
"added" to speakers all the time when microphone is unmuted.
Thanks!
--
Sincerely,
Aere
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