Public bug reported:
Binary package hint: pulseaudio
In Ubuntu 9.04, the 5.1 sound worked properly, but after installing 9.10
(i386), some speakers are too silent.
After startup, the front speakers are always set to volume 0, with alsamixer I
can turn them up. Then they will have proper volume until *reboot*. After
re-login, the volumes are changed again, but front speakers are still okay.
The LFE and center speakers do play sound but they are way too silent. Even if
I turn the subwoofer setting in the Sound preferences dialog to maximum AND the
LFE setting in alsamixer to maximum, the subwoofer and center speakers are
barely hearable.
Workaround for the subwoofer:
Change the Device Profile in the Sound Preferences to another Profile and then
back again. After this, the subwoofer and center speakers are good. amixer does
not show any difference after this.
But for each new application that plays sound this has to be repeated. When
playing music, this has to be repeated after each song...
The tricks from Pulseaudio FAQ do not help.
System:
>lspci
Audio device: nVidia Corporation MCP72XE/MCP72P/MCP78U/MCP78S High Definition
Audio (rev a1)
>cat /proc/asound/cards
0 [NVidia ]: HDA-Intel - HDA NVidia
HDA NVidia at 0xfcf78000 irq 20
Versions:
Kernel: 2.6.31-14-generic-pae
alsa-base: 1.0.20+dfsg-1ubuntu5
pulseaudio: 1:0.9.19-0ubuntu4
Interesting syslog messages:
Nov 13 10:38:19 x4pc pulseaudio[2114]: alsa-sink.c: ALSA woke us up to write
new data to the device, but there was actually nothing to write!
Nov 13 10:38:19 x4pc pulseaudio[2114]: alsa-sink.c: Most likely this is a bug
in the ALSA driver 'snd_hda_intel'. Please report this issue to the ALSA
developers.
Nov 13 10:38:19 x4pc pulseaudio[2114]: alsa-sink.c: We were woken up with
POLLOUT set -- however a subsequent snd_pcm_avail() returned 0 or another value
< min_avail.
Nov 13 10:38:22 x4pc pulseaudio[2114]: ratelimit.c: 14 events suppressed
Nov 13 10:38:28 x4pc pulseaudio[2114]: ratelimit.c: 3 events suppressed
Nov 13 10:41:06 x4pc pulseaudio[2114]: ratelimit.c: 2 events suppressed
Please give me a hint how to debug this further.
ProblemType: Bug
Architecture: i386
ArecordDevices:
**** List of CAPTURE Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: VT1708B Analog [VT1708B Analog]
Subdevices: 1/2
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC0D0p: x4 2605 F...m pulseaudio
/dev/snd/pcmC0D0c: x4 2605 F...m pulseaudio
/dev/snd/controlC0: x4 2605 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'NVidia'/'HDA NVidia at 0xfcf78000 irq 20'
Mixer name : 'VIA VT1708B 8-Ch'
Components : 'HDA:1106e721,10438345,00100100'
Controls : 34
Simple ctrls : 18
Date: Fri Nov 13 12:30:16 2009
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
NonfreeKernelModules: nvidia
Package: pulseaudio 1:0.9.19-0ubuntu4
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic-pae
SourcePackage: pulseaudio
Uname: Linux 2.6.31-14-generic-pae i686
XsessionErrors:
(gnome-settings-daemon:2623): GLib-CRITICAL **: g_propagate_error: assertion
`src != NULL' failed
(gnome-settings-daemon:2623): GLib-CRITICAL **: g_propagate_error: assertion
`src != NULL' failed
(nautilus:2719): Eel-CRITICAL **: eel_preferences_get_boolean: assertion
`preferences_is_initialized ()' failed
(polkit-gnome-authentication-agent-1:2776): GLib-CRITICAL **:
g_once_init_leave: assertion `initialization_value != 0' failed
(gnome-panel:2718): Gdk-WARNING **:
/build/buildd/gtk+2.0-2.18.3/gdk/x11/gdkdrawable-x11.c:952 drawable is not a
pixmap or window
** Affects: pulseaudio (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386
--
nVidia MCP78S-snd_hda_intel: surround speaker volumes irrational
https://bugs.launchpad.net/bugs/481860
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