your log does not show how pulseaudio upmix stereo to surround21 can you post the output of alsa-info.sh ?
( 67.454| 0.000) D: [pulseaudio] resampler.c: Channel matrix: ( 67.454| 0.000) D: [pulseaudio] resampler.c: I00 I01 I02 I03 I04 I05 ( 67.454| 0.000) D: [pulseaudio] resampler.c: +------------------------------------ ( 67.454| 0.000) D: [pulseaudio] resampler.c: O00 | 0,675 0,000 0,100 0,000 0,375 0,000 ( 67.454| 0.000) D: [pulseaudio] resampler.c: O01 | 0,000 0,675 0,000 0,100 0,375 0,000 ( 67.454| 0.000) D: [pulseaudio] resampler.c: O02 | 0,000 0,000 0,000 0,000 0,000 1,000 ( 67.454| 0.000) D: [pulseaudio] resampler.c: O03 | 0,000 0,000 0,000 0,000 0,000 1,000 ( 67.454| 0.000) I: [pulseaudio] sink-input.c: Created input 18 "ALSA Playback" on alsa_output.pci-0000_00_1b.0.analog-surround-21 with sample spec s16le 6ch 48000Hz and channel map front-left,front-right,rear-left ,rear-right,front-center,lfe ( 72.290| 0.000) D: [pulseaudio] resampler.c: Channel matrix: ( 72.290| 0.000) D: [pulseaudio] resampler.c: I00 ( 72.290| 0.000) D: [pulseaudio] resampler.c: +------ ( 72.290| 0.000) D: [pulseaudio] resampler.c: O00 | 1,000 ( 72.290| 0.000) D: [pulseaudio] resampler.c: O01 | 1,000 ( 72.290| 0.000) D: [pulseaudio] resampler.c: O02 | 1,000 ( 72.290| 0.000) D: [pulseaudio] resampler.c: O03 | 1,000 ( 72.291| 0.000) I: [pulseaudio] sink-input.c: Created input 19 "ALSA Playback" on alsa_output.pci-0000_00_1b.0.analog-surround-21 with sample spec s16le 1ch 48000Hz and channel map mono -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/871808 Title: Asus N55SF/N75SF - External subwoofer not working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/871808/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
