I have a problem on my Ubuntu 10.04 machine with audio output. When playing audio with a headset connected it can be heard on speakers and headset in the same time. It is similar to other questions I found on internet. But what is different is that when I change channel balance to left then only speaker is used. When I changed it to the right only headset is used. It looks like speaker is treated as left channel and headset as the right channel.
My machine is a custom build Intel Atom based PC.
Audio driver snd-intel8x0
Some additional information:
dddd@dddd:~$ lspci | grep audio 00:1e.2 Multimedia audio controller: Intel Corporation 82801G (ICH7 Family) AC'97 Audio Controller (rev 02) dddd@dddd:/proc/asound$ cat /proc/asound/version Advanced Linux Sound Architecture Driver Version 1.0.23. Compiled on Apr 21 2011 for kernel 2.6.32-32-generic-pae (SMP). dddd@dddd:/proc/asound$ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: ICH7 [Intel ICH7], device 0: Intel ICH [Intel ICH7] Subdevices: 0/1 Subdevice #0: subdevice #0 card 0: ICH7 [Intel ICH7], device 4: Intel ICH - IEC958 [Intel ICH7 - IEC958] Subdevices: 1/1 Subdevice #0: subdevice #0 00:1e.2 Multimedia audio controller: Intel Corporation 82801G (ICH7 Family) AC'97 Audio Controller (rev 02) Flags: bus master, medium devsel, latency 0, IRQ 17 I/O ports at d000 [size=256] I/O ports at cc00 [size=64] Memory at fe93b800 (32-bit, non-prefetchable) [size=512] Memory at fe93b400 (32-bit, non-prefetchable) [size=256] Capabilities: <access denied> Kernel driver in use: Intel ICH Kernel modules: snd-intel8x0