[Pkg-alsa-devel] Bug#722190: Only channel left is heard when headphones are used

Alexis PM alexispm_stellaluna at yahoo.es
Sun Sep 8 21:53:45 UTC 2013

Package: alsa-base
Version: 1.0.25+3~deb7u1
Severity: normal
X-Debbugs-CC: xiuxiuliu at coincidance.net

In Wheezy with KDE (all packages are updated and all are official Debian packages), when I use headphones (minijack output), only 1 channel (channel left) is heard, but the 2 channels are heard if I disconnect the headphones and use the speakers. 

This soundcard works fine in Squeeze (in other partition of the computer).

Audio packages installed: alsa-base alsa-oss alsa-tools alsa-tools-gui alsa-utils alsamixergui libpulse0 libpulse-mainloop-glib0 (all in Wheezy versions) (pulseaudio is not installed)

In alsamixergui all channels are to maximum.

# lspci | grep Audio
00:1b.0 Audio device: Intel Corporation NM10/ICH7 Family High Definition Audio Controller (rev 02)

# alsactl init
Found hardware: "HDA-Intel" "SigmaTel STAC9221 A1" "HDA:83847680,106b0a00,00103401" "0x8384" "0x7680"
Hardware is initialized using a generic method

If I do "speaker-test -Dplug:front -c2" I hear the two channels alternately when I use spakers, but when I use headphones I hear only silence when is testing the the right channel

$ speaker-test -Dplug:front -c2

speaker-test 1.0.25

Playback device is plug:front
Stream parameters are 48000Hz, S16_LE, 2 channels
Using 16 octaves of pink noise
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 64 to 16384
Period size range from 32 to 8192
Using max buffer size 16384
Periods = 4
was set period_size = 4096
was set buffer_size = 16384
 0 - Front Left
 1 - Front Right

Thank you very much

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