Public bug reported:
Description:
In certain applications, including FluidSynth (and sometimes VLC) yet not
Rhythmbox, the onboard audio of the Gigabyte GA-MA770T-UD3P (rev. 1.0)
motherboard "sort of" works; there is a loud, distorted crackling noise mixed
with the audio. A different, more "ordinary" crackle occurs in audio recorded
using Sound Recorder and Skype.
Both playback and recording in 12.04 and 12.10 are affected. I do not
remember how well the audio worked in 11.10. Sometimes, after some time
has elapsed, or when other applications (e.g. Flash plugin) are opened,
the crackle goes away. In fact, it did go away a couple seconds after I
clicked Apport's "Close" button after reproducing the bug using the
steps below.
Workarounds I tried:
Upgrading to the latest DKMS driver snapshot (dkms-hda -
0.201212071018~quantal1) made no difference. "position_fix=1" made no
difference either (perhaps that was already in use). "position_fix=2" removed
the crackle but caused a sound I can best describe as "CD skipping".
Adding the "tsched=0" setting to /etc/pulse/default.pa did work for
playback. However, this did not fix recording in the aforementioned
applications.
Steps to reproduce (on my hardware):
1. sudo apt-get install fluid-soundfont-gm fluid-soundfont-gs fluidsynth
2. pulseaudio -k
3. fluidsynth -nia pulseaudio /usr/share/sounds/sf2/*.sf2 foo.mid
fluidsynth -nia alsa is also problematic, EXCEPT when I specify "-o
'audio.alsa.device=hw'".
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: alsa-base 1.0.25+dfsg-0ubuntu3
ProcVersionSignature: Ubuntu 3.5.0-19.30-generic 3.5.7
Uname: Linux 3.5.0-19-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: ki 2598 F.... pulseaudio
/dev/snd/controlC0: ki 2598 F.... pulseaudio
/dev/snd/pcmC0D0p: ki 2598 F...m pulseaudio
Date: Fri Dec 7 22:31:35 2012
InstallationDate: Installed on 2012-03-13 (269 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:SB successful
Symptom_Card: Built-in Audio - HDA ATI SB
Symptom_Jack: Green Line Out, Rear
Symptom_PulsePlaybackTest: PulseAudio playback test successful
Symptom_Type: Underruns, dropouts, or "crackling" sound
Title: [GA-MA770T-UD3P, Realtek ALC888, Green Line Out, Rear] Underruns,
dropouts or crackling sound
UpgradeStatus: Upgraded to quantal on 2012-12-08 (0 days ago)
dmi.bios.date: 03/22/2011
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F12
dmi.board.name: GA-MA770T-UD3P
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias:
dmi:bvnAwardSoftwareInternational,Inc.:bvrF12:bd03/22/2011:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA770T-UD3P:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA770T-UD3P:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-MA770T-UD3P
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug quantal running-unity
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https://bugs.launchpad.net/bugs/1087916
Title:
[GA-MA770T-UD3P, Realtek ALC888] Distorted crackling noise when using
FluidSynth
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