W dniu 22.06.2011 15:54, Colin Guthrie pisze: > 'Twas brillig, and Julian Sikorski at 20/06/11 22:19 did gyre and gimble: >> W dniu 20.06.2011 10:33, Colin Guthrie pisze: >>> 'Twas brillig, and Julian Sikorski at 19/06/11 20:31 did gyre and gimble: >>>> W dniu 19.06.2011 18:20, Colin Guthrie pisze: >>>>> The output from amixer -c0 would likely offer some clues. >>>> >>>> I am attaching the screenshot of alsamixer -c0 >>> >>> The amixer -c0 output is infinity more useful for debug than a screenshot ;) >>> >>> Col >>> >>> >> Here you go. > > OK, so something is missing here... it's missing any kcontrols for > adjusting any surround sound elements. > > > Every bit of hardware is different, but e.g. on I happen to have to hand > says (among other things): > > Simple mixer control 'Surround',0 > Capabilities: pvolume pswitch penum > Playback channels: Front Left - Front Right > Limits: Playback 0 - 31 > Mono: > Front Left: Playback 0 [0%] [-46.50dB] [off] > Front Right: Playback 0 [0%] [-46.50dB] [off] > Simple mixer control 'Surround Down Mix',0 > Capabilities: pswitch pswitch-joined penum > Playback channels: Mono > Mono: Playback [off] > Simple mixer control 'Surround Jack Mode',0 > Capabilities: enum > Items: 'Shared' 'Independent' > Item0: 'Shared' > Simple mixer control 'Center',0 > Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum > Playback channels: Mono > Limits: Playback 0 - 31 > Mono: Playback 31 [100%] [0.00dB] [off] > Simple mixer control 'Center/LFE Down Mix',0 > Capabilities: pswitch pswitch-joined penum > Playback channels: Mono > Mono: Playback [off] > Simple mixer control 'LFE',0 > Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum > Playback channels: Mono > Limits: Playback 0 - 31 > Mono: Playback 0 [0%] [-46.50dB] [off] > > > > So something is wrong at the alsa level. You may be able to play back > 5.1 sound but there are no controls to back that up. > > You should try something like e.g. > > [colin at jimmy ~]$ pasuspender bash > [colin at jimmy ~]$ speaker-test -D surround51:0 > > speaker-test 1.0.24.2 > > Playback device is surround51:0 > Stream parameters are 48000Hz, S16_LE, 1 channels > Using 16 octaves of pink noise > Channels count (1) not available for playbacks: Invalid argument > Setting of hwparams failed: Invalid argument > [colin at jimmy ~]$ exit > > > I expect you'll get a similar failure I get there. If it works correctly > and you hear things from each speaker separately then I'd be surprised. I got the same failure: [julas at snowball2 ~]$ speaker-test -D surround51:0 speaker-test 1.0.24.1 Playback device is surround51:0 Stream parameters are 48000Hz, S16_LE, 1 channels Using 16 octaves of pink noise Channels count (1) not available for playbacks: Z?y argument Setting of hwparams failed: Z?y argument > But if it does fail, then it could simply be a matter that the incorrect > model was detected for your HDA driver. > > http://www.kernel.org/doc/Documentation/sound/alsa/HD-Audio-Models.txt I have looked there before, but there are no models listed for ALC892. It might be the case that the hardware is just too new - this laptop model came out in January. I guess I should take this to alsa developers then, do you know which is the best way to get their attention? Bugzilla? ML? Julian
