2012/6/1 David Henningsson david.henningsson@canonical.com:

On 06/01/2012 04:54 AM, Raymond Yau wrote:

...

what is the definition of "Mono Output" in pulseaudio ?

My three other sound cards does support mono playback and mono capture

The system setting/sound in gnome session allow me to select "mono duplex" but when it does not allow me to select "mono output + mono input" in unity session.

That sounds like the known bug I was working on yesterday.

The major problem of Analog Mono output is clipping

it seem pulseaudio just add the left and right channels instead of half of the left and right channels and the sound is distorted

why database contrain invalid format since it is a clean install of ubuntu 12.04l

D: [pulseaudio] module-device-restore.c: Database contains invalid data for key: sink:alsa_output.pci-0000_04_02.0.analog-mono:null D: [pulseaudio] module-suspend-on-idle.c: Sink alsa_output.pci-0000_04_02.0.analog-mono becomes idle, timeout in 5 seconds. I: [pulseaudio] resampler.c: Forcing resampler 'copy', because of fixed, identical sample rates. D: [pulseaudio] resampler.c: Channel matrix: D: [pulseaudio] resampler.c: I00 I01 D: [pulseaudio] resampler.c: +------------ D: [pulseaudio] resampler.c: O00 | 1.000 1.000 I: [pulseaudio] remap.c: Using generic matrix remapping