[Karmic] CPU audible through laptop speakers

[Matthew Murphy]

I've been having an issue where the audio in the current build of Karmic is a bit cludgy. It tends to audibly pop on when audio is set to play and crackle constantly through the speakers whenever there is no sound being transmitted. It seems that it may be making audible the signals of the CPU through the speaker, as the noise coming out is generally relative to the activity of the computer at the time.

Running updated 9.10 Karmic development branch.

[David Henningsson (diwic)]

please provide more information by running the command "apport-collect -p pulseaudio 435725".

[callum (callumdryden)]

Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: callum 6854 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0x92400000 irq 22'
   Mixer name : 'Conexant CX20549 (Venice)'
   Components : 'HDA:14f15045,103c30d9,00100100'
   Controls : 18
   Simple ctrls : 8
DistroRelease: Ubuntu 9.10
Package: pulseaudio 1:0.9.19-0ubuntu2
PackageArchitecture: i386
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_GB.UTF-8
 LANGUAGE=en_GB.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14.46-generic
Uname: Linux 2.6.31-14-generic i686
UserGroups: adm admin audio cdrom dialout dip floppy fuse lpadmin plugdev video

[David Henningsson (diwic)]

A few thoughts...

1) Does it work better in other operating systems and/or distributions, i e can we rule out broken or bad quality hardware?

2) If you issue the command "alsamixer -c 0" and fiddle around with the "Master" and "PCM" settings, will that affect the behavior?

[ctetrault (ctetrault)]

Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: NVidia [HDA NVidia], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: christopher 1533 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'NVidia'/'HDA NVidia at 0xb0000000 irq 21'
   Mixer name : 'Conexant CX20549 (Venice)'
   Components : 'HDA:14f15045,103c30b7,00100100'
   Controls : 19
   Simple ctrls : 9
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: pulseaudio 1:0.9.19-0ubuntu4
PackageArchitecture: i386
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_CA.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
Uname: Linux 2.6.31-14-generic i686
UserGroups: adm admin audio cdrom dialout dip floppy fuse lpadmin plugdev video
XsessionErrors:
 (gnome-settings-daemon:573): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (gnome-settings-daemon:573): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (polkit-gnome-authentication-agent-1:685): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (nautilus:655): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (gnome-panel:654): Gtk-WARNING **: Attempting to read the recently used resources file at `/home/christopher/.recently-used.xbel', but the parser failed: Error reading file '/home/christopher/.recently-used.xbel': Is a directory.

[Daniel T Chen (crimsun)]

These symptoms are reminiscent of a noisy bus, which is nothing that
ALSA or PulseAudio can work around. You may have some luck attempting
to set the PCI latency.

[Phuah Yee Keat (ykphuah)]

Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: ykphuah 1944 F.... pulseaudio
 /dev/snd/pcmC0D0p: ykphuah 1944 F...m pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf4800000 irq 22'
   Mixer name : 'Intel G45 DEVCTG'
   Components : 'HDA:10ec0269,17aa4000,00100004 HDA:80862802,80860101,00100000'
   Controls : 23
   Simple ctrls : 12
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
Package: pulseaudio 1:0.9.19-0ubuntu4
PackageArchitecture: amd64
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-15.50-generic
Uname: Linux 2.6.31-15-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[David Henningsson (diwic)]

@Phuah, please try to upgrade your sound drivers according to https://wiki.ubuntu.com/DebuggingSoundProblems/KarmicCaveats#Sound%20drivers%20needs%20to%20be%20updated and see if that helps.

[Brad Figg (brad-figg)]

Please, if you are still having issues, test with the latest development release of Ubuntu. ISO CD images are available from http://cdimage.ubuntu.com/releases/ .

If it remains an issue, could you run the following command from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p alsa-base 435725

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds .

Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text.

Please let us know your results.

[Launchpad Janitor (janitor)]

[Expired for alsa-driver (Ubuntu) because there has been no activity for 60 days.]