apport information
** Tags added: apport-collected
** Description changed:
Binary package hint: pulseaudio
Release
----------
Description: Ubuntu maverick (development branch)
Release: 10.10
Package Version
---------------------
pulseaudio:
Installed: 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu17
Candidate: 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu17
Version table:
*** 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu17 0
500 http://gb.archive.ubuntu.com/ubuntu/ maverick/main amd64 Packages
100 /var/lib/dpkg/status
Hardware
------------
Generic C-Media 8738 7.1 (only use 4 channels)
4.0 Speaker system
Configuration
-----------------
"Sound Preferences -> Hardware" is set to use "Analog Surround 4.0 Output"
for the CM8738 device
"Sound Preferences -> Output" is set the the correct device, which the
balance and fader in the center
/etc/pulse/daemon.conf has "default-sample-channels = 4"
Expected Result
---------------------
The master volume should control both the front and the rear speakers
Actual Result
-----------------
The master volume control only controls the front speakers. The real
speakers are set to FULL volume.
Other
-------
A bit of searching turned up the following text at
http://alsa.opensrc.org/index.php/Cmipci#4.2F6_Multi-Channel_Playback
"WARNING
When "Four Channel Mode" switch is off, the output from rear speakers
will be FULL VOLUME regardless of Master and PCM volumes. This might
damage your audio equipment. Please disconnect speakers before your turn
off this switch. "
If I didn't have a separate master volume switch on the speakers
themselves, this would have happened to me.
Being as Sound Preferences itself doesn't seem to have the "4 channel
mode" switch, I installed gnome-alsamixer. This does show the "Four
Channel Mode" setting. However, when pulsedaemon is running, it is not
possible to select the switch. If I kill pulsedaemon, the switch can be
enabled and the speakers act as expected (I used speakertest to prove
this).
- This problem has existed ever since the introduction of Pulse as the
- default.
+ This problem has existed ever since the introduction of Pulse as the default.
+ ---
+ AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
+ Architecture: amd64
+ AudioDevicesInUse:
+ USER PID ACCESS COMMAND
+ /dev/snd/controlC0: tanktarta 1802 F.... pulseaudio
+ /dev/snd/pcmC0D0p: tanktarta 1802 F...m pulseaudio
+ Card0.Amixer.info:
+ Card hw:0 'CMI8738'/'C-Media CMI8738 (model 55) at 0xbc00, irq 16'
+ Mixer name : 'CMedia PCI'
+ Components : ''
+ Controls : 41
+ Simple ctrls : 22
+ DistroRelease: Ubuntu 10.10
+ InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha amd64 (20100906)
+ NonfreeKernelModules: nvidia
+ Package: pulseaudio 1:0.9.22~0.9.21+stable-queue-32-g8478-0ubuntu17
+ PackageArchitecture: amd64
+ ProcEnviron:
+ PATH=(custom, user)
+ LANG=en_GB.UTF-8
+ SHELL=/bin/bash
+ ProcVersionSignature: Ubuntu 2.6.35-20.29-generic 2.6.35.4
+ Tags: maverick
+ Uname: Linux 2.6.35-20-generic x86_64
+ UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
+ dmi.bios.date: 12/13/2007
+ dmi.bios.vendor: Phoenix Technologies, LTD
+ dmi.bios.version: 6.00 PG
+ dmi.board.name: GeForce6100PM-M2
+ dmi.board.vendor: ECS
+ dmi.board.version: 2.0
+ dmi.chassis.asset.tag: Unknow
+ dmi.chassis.type: 3
+ dmi.chassis.vendor: ECS
+ dmi.chassis.version: Unknow
+ dmi.modalias:
dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd12/13/2007:svnECS:pnGeForce6100PM-M2:pvr2.0:rvnECS:rnGeForce6100PM-M2:rvr2.0:cvnECS:ct3:cvrUnknow:
+ dmi.product.name: GeForce6100PM-M2
+ dmi.product.version: 2.0
+ dmi.sys.vendor: ECS
+ mtime.conffile..etc.pulse.daemon.conf: 2010-09-07T13:14:22
** Attachment added: "AlsaDevices.txt"
https://bugs.edge.launchpad.net/bugs/632389/+attachment/1556557/+files/AlsaDevices.txt
--
Rear speakers always at full volume using Pulseaudio with C-Media 8738
https://bugs.launchpad.net/bugs/632389
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