NVM I was probably wrong about those two confs. FWIW, here are the speaker-test results of my builtin 7.1 audio (HDA Intel PCH/Realtek ALC887-VD), when I have my only pair of stereo speaker connected to the Center/Subwoofer port: Firstly I tested with: speaker-test -D hw:PCH -c 2 -l 1 speaker-test -D hw:PCH -c 4 -l 1 speaker-test -D hw:PCH -c 6 -l 1 speaker-test -D hw:PCH -c 8 -l 1 These 4 are the layout that support natively by the driver/hardware. Interestingly, for: speaker-test -D hw:PCH -c 2 -l 1 speaker-test -D hw:PCH -c 4 -l 1 I can hear sound coming out from my speakers respectively when: 0 - Front Left 1 - Front Right is playing. But while I did NOT change the physical connection at all, for these: speaker-test -D hw:PCH -c 6 -l 1 speaker-test -D hw:PCH -c 8 -l 1 I can hear sound coming out from my speakers respectively when: 4 - Front Center (LEFT speaker) 5 - LFE (RIGHT speaker) is playing. Then I test with: speaker-test -D surround21:CARD=PCH,DEV=0 -c 3 -l 1 speaker-test -D surround41:CARD=PCH,DEV=0 -c 5 -l 1 speaker-test -D surround50:CARD=PCH,DEV=0 -c 5 -l 1 which are the only 3 PCMs with ttable in their conf. For: speaker-test -D surround21:CARD=PCH,DEV=0 -c 3 -l 1 I can hear sound coming out from my RIGHT speaker when: 2 - LFE is playing. For: speaker-test -D surround41:CARD=PCH,DEV=0 -c 5 -l 1 I can hear sound coming out from my RIGHT speaker when: 4 - LFE is playing. For: speaker-test -D surround50:CARD=PCH,DEV=0 -c 5 -l 1 I can hear sound coming out from my LEFT speaker when: 4 - Front Center is playing. I think you can test with similar commands. The only part you need to change is probably "PCH". Also the one with "-c 8" probably won't work on your device. Last but not least, can you paste your output of: cat /proc/asound/cards So that we can get an idea on which conf in /usr/share/alsa/cards/ is your card relying on? On 16 January 2016 at 17:59, Tom Yan <tom.ty89 at gmail.com> wrote: > I think you should use speaker-test to test the various PCMs in aplay > -L first, so that you can at least get a hint on whether it has > something to do with ALSA or pulse. For example: > > [tom at localhost ~]$ speaker-test -D surround21:CARD=PCH,DEV=0 -c 3 -l 1 > > speaker-test 1.1.0 > > Playback device is surround21:CARD=PCH,DEV=0 > Stream parameters are 48000Hz, S16_LE, 3 channels > Using 16 octaves of pink noise > Rate set to 48000Hz (requested 48000Hz) > Buffer size range from 22 to 349525 > Period size range from 11 to 174762 > Using max buffer size 349524 > Periods = 4 > was set period_size = 87381 > was set buffer_size = 349524 > 0 - Front Left > 1 - Front Right > 2 - LFE > Time per period = 5.470904 > [tom at localhost ~]$ speaker-test -D surround41:CARD=PCH,DEV=0 -c 5 -l 1 > > speaker-test 1.1.0 > > Playback device is surround41:CARD=PCH,DEV=0 > Stream parameters are 48000Hz, S16_LE, 5 channels > Using 16 octaves of pink noise > Rate set to 48000Hz (requested 48000Hz) > Buffer size range from 22 to 349525 > Period size range from 11 to 174762 > Using max buffer size 349524 > Periods = 4 > was set period_size = 87381 > was set buffer_size = 349524 > 0 - Front Left > 1 - Front Right > 3 - Rear Right > 2 - Rear Left > 4 - LFE > Time per period = 9.121826 > [tom at localhost ~]$ speaker-test -D surround51:CARD=PCH,DEV=0 -c 6 -l 1 > > speaker-test 1.1.0 > > Playback device is surround51:CARD=PCH,DEV=0 > Stream parameters are 48000Hz, S16_LE, 6 channels > Using 16 octaves of pink noise > Rate set to 48000Hz (requested 48000Hz) > Buffer size range from 22 to 349525 > Period size range from 11 to 174762 > Using max buffer size 349524 > Periods = 4 > was set period_size = 87381 > was set buffer_size = 349524 > 0 - Front Left > 4 - Front Center > 1 - Front Right > 3 - Rear Right > 2 - Rear Left > 5 - LFE > Time per period = 10.953665 > [tom at localhost ~]$ > > I do feel like surround21.conf and surround41.conf is problematic > though. I don't see why it should map LFE that way if it relys on > surround51. It should be always "5 - LFE". I'll probably write to ALSA > devel about it soon. > > On 16 January 2016 at 17:32, Nazar Mokrynskyi <nazar at mokrynskyi.com> wrote: >> Noise appears when I test speaker in sound settings UI, so there is no >> specific command. Also, when test sound stops - clicking doesn't. >> I know it doesn't make sense, but it is what it is. >> BTW, noise appears in target output, meaning even if I do not skip output, >> but try to direct LFE to third output (one of rear speakers), there is no >> sound there, only mentioned noise. >> >> Is it possible that sound card doesn't want to output low frequency sound on >> other than default output, I mean some hardware/firmware limitation? >> I'd be fine if LFE worked with 3rd output instead of 6th. >> >> Sincerely, Nazar Mokrynskyi >> github.com/nazar-pc >> Skype: nazar-pc >> Diaspora: nazarpc at diaspora.mokrynskyi.com >> Tox: >> A9D95C9AA5F7A3ED75D83D0292E22ACE84BA40E912185939414475AF28FD2B2A5C8EF5261249 >> >> On 16.01.16 10:24, Tom Yan wrote: >>> >>> Sorry, I meant surround21. >>> >>> On 16 January 2016 at 17:21, Tom Yan <tom.ty89 at gmail.com> wrote: >>>> >>>> What do you mean by "noise in nth output starting from 1 instead, >>>> relatively hight frequency light clicking"? How were you testing >>>> exactly? speaker-test? if so what're the "-D"s you used? Can you paste >>>> full commands (and maybe even the text output). >>>> >>>> What you said doesn't seem to make sense. If surround51 works, then >>>> surround41 and surround20 should at most cause a signal/speaker >>>> mismatch. I don't see how it can produce some weird noise/click. >>>> >>>> On 16 January 2016 at 16:26, Nazar Mokrynskyi <nazar at mokrynskyi.com> >>>> wrote: >>>>> >>>>> OK, I've spent another hour or so trying different combinations and it >>>>> seems >>>>> to be a bug inside either ALSA or PulseAudio. >>>>> SB Omni Surround 5.1, as you can see from name, has 6 outputs: >>>>> front-left,front-right,rear-left,rear-right,front-center,lfe (lets >>>>> ignore >>>>> other non-related inputs/outputs here) >>>>> I've done many experiments and defined which modes are working and which >>>>> doesn't. >>>>> >>>>> Modes that work fine: >>>>> - 5.1 >>>>> - 5.0 >>>>> - 4.0 >>>>> - 2.0 >>>>> >>>>> Modes that doesn't work fine: >>>>> - 2.1 (stereo only, noise in 3rd output starting from 1 instead, >>>>> relatively >>>>> hight frequency light clicking) >>>>> - 4.1 (quadro only, noise in 5th output starting from 1 instead, >>>>> relatively >>>>> hight frequency light clicking) >>>>> >>>>> It is clearly visible that any time I want to skip some output, for >>>>> instance: >>>>> ttable.0.FL 1 >>>>> ttable.1.FR 1 >>>>> ttable.5.LFE 1 >>>>> instead of >>>>> ttable.0.FL 1 >>>>> ttable.1.FR 1 >>>>> ttable.2.LFE 1 >>>>> >>>>> To direct LFE to proper output it doesn't work. This is the same reason >>>>> why >>>>> 5.0 is working fine (no skipped outputs, all consequent) and 4.1 doesn't >>>>> (we >>>>> need to skip 5th output starting from 1 and use 6th instead). >>>>> >>>>> When I try this: >>>>> ttable.0.FL 1 >>>>> ttable.2.FR 1 >>>>> ttable.1.LFE 1 >>>>> then as expected I can hear LFE in right front output. >>>>> >>>>> Any hints from anyone what is wrong here? There are literally NO DOCS >>>>> about >>>>> how it works internally, so these experiments all I can provide at the >>>>> moment. >>>>> There were pulseaudio logs in this thread if anyone needs details. >>>>> >>>>> ALSA 1.1.0, PulseAudio 7.1, Ubuntu 16.04 x64 >>>>> >>>>> Sincerely, Nazar Mokrynskyi >>>>> github.com/nazar-pc >>>>> Skype: nazar-pc >>>>> Diaspora: nazarpc at diaspora.mokrynskyi.com >>>>> Tox: >>>>> >>>>> A9D95C9AA5F7A3ED75D83D0292E22ACE84BA40E912185939414475AF28FD2B2A5C8EF5261249 >>>>> >>>>> On 28.11.15 09:56, Raymond Yau wrote: >>>>> >>>>> >>>>>> I've been looking at those lines. Do you think it should be done in >>>>>> USB-Audio, or should it be added into separate config file specific for >>>>>> this >>>>>> sound card? >>>>> >>>>> >>>>> http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/conf/pcm/surround21.conf;hb=HEAD >>>>> >>>>> The route of surround21 is hardcoded to use surround51 , this mean your >>>>> ttable are used by those usb audio support 6 channels, those usb audio >>>>> which >>>>> only support 8 channels need to define their own 21 route as both >>>>> surround51 >>>>> and surround71 of usb audio use route plugin >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> pulseaudio-discuss mailing list >>>>> pulseaudio-discuss at lists.freedesktop.org >>>>> http://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> pulseaudio-discuss mailing list >>>>> pulseaudio-discuss at lists.freedesktop.org >>>>> http://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss >>>>> >>> _______________________________________________ >>> pulseaudio-discuss mailing list >>> pulseaudio-discuss at lists.freedesktop.org >>> http://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss >> >> >> >> >> _______________________________________________ >> pulseaudio-discuss mailing list >> pulseaudio-discuss at lists.freedesktop.org >> http://lists.freedesktop.org/mailman/listinfo/pulseaudio-discuss >>
