> > >>> > > > >>> After Ubuntu 10.04 LTS (Ubuntu 10.10 works, Ubuntu 11.04 doesn't > > > work at > > > >>> all, Ubuntu 11.10 and newer have the bug), the headset only plays > > > sound > > > >>> at maximum volume level if the volume is turned down just a little > no > > > >>> sound is being played. > > > >>> > > > >>> I have filled a Ubuntu bug for 12.04 LTS at: > > > >>> https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1200925. > > > >>> > > > >>> AlsaInfo for Ubuntu 12.04 LTS with the bug: > > > >>> > > > > http://www.alsa-project.org/db/?f=3bde76b15a15f585418a6a4a4703ca67fd4cdf42 > > > . > > > >>> AlsaInfo for Ubuntu 10.04 LTS without the bug: > > > >>> > > > > http://www.alsa-project.org/db/?f=5824e55345c3f7128937405254485a489886b9dc > > > >> > > > >> > > > >> > > > >> It is strange that dB range of your usb audio is 0 to 0.14 (only > > > small gain and no attenuation) > > > >> > > > >> In 10.04 LTS pulseaudio provide software volume control > > > >> > > > >> > > > >> ( 1.095| 0.000) I: alsa-sink.c: Driver does not support hardware > > > volume control, falling back to software volume control. > > > >> > > > >> > > > >> control.6 { > > > >> comment.access 'read write' > > > >> comment.type INTEGER > > > >> comment.count 1 comment.range '0 - 37' > > > >> comment.dbmin 0 comment.dbmax 14 > > > >> iface MIXER > > > >> name 'Speaker Playback Volume' value 30 } > > > >> > > > >> > > > >> In 12.04 pulseaudio did not provide software volume attenuation > > > and use the speaker playback volume control > > > > > > > > > > > > So does that mean that the bug is in pulseaudio, or could it be even > > > deeper like in the kernel or something? > > > > > > Are there any significant change in volume when you use "alsamixer > > > -c0" to change speaker playback volume from min 0dB to 0.14dB ? > > > > > > Did pulseaudio provide software attuentation -1.61dB when the range of > > > hardware volume control is only 0.14dB ? > > > > > > * index: 0 > > > name: <alsa_output.usb-0d8c_USB_Audio-00-Audio.analog-surround-71> > > > driver: <module-alsa-card.c> > > > flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY > > > DYNAMIC_LATENCY > > > state: SUSPENDED > > > suspend cause: IDLE > > > priority: 9049 > > > volume: 0: 94% 1: 94% 2: 94% 3: 94% 4: 94% 5: 94% 6: 94% 7: 94% > > > 0: -1,61 dB 1: -1,61 dB 2: -1,61 dB 3: -1,61 dB 4: -1,61 dB 5: > > > -1,61 dB 6: -1,61 dB 7: -1,61 dB > > > balance 0,00 > > > base volume: 99% > > > -0,14 dB > > > volume steps: 65537 > > > muted: no > > > > > > It is strange that 5.1 headset only support 8 channels playback > > > > > Okay i did try "alsamixer -c0" in Ubuntu 12.04 LTS, i selected the Usb > > Headset, Speaker was at 0 using the remote control from the headset i > > could bring the value to 86, so if the volume is turned down the value > > goes immideatly to 0. > > With the alsamixer i was able to regulate the value between 0 and 100, > > db-change is 0,01 at lowest and 0,14 at highest. > > I could increment/decrement the db-change in steps of 0,01 (with the > > up/down keys from the keyboard), the volume from the headset-speakers > > follows accordingly. > > When using anything besides the "alsamixer -c0" the volume can only be 0 > > or 86. > > I was able to play the test sounds for: front center, front left, front > > right, rear left,rear right and subwoofer every thing came from the > > right direction, as expected from a 5.1 headset. > > I was really surprised, thank you for pointing this out, it really > > didn't occur to me, maybe i saw the alsamixer some years ago but i > > really couldn't remember that it was there. > > The reason it doesn't work with PulseAudio is that the dB information > obtained from the hardware is pretty bogus, thus it confuses the PA > mixer which relies purely on dB level. > > Have you tried any newer kernels, 3.9.x or 3.10.x, at least? > 3.2.x is really old for debugging such a device-specific problem. > > AudioControl Interface Descriptor: bLength 25 bDescriptorType 36 bDescriptorSubtype 4 (MIXER_UNIT) bUnitID 12 bNrInPins 3 baSourceID( 0) 1 baSourceID( 1) 9 baSourceID( 2) 11 bNrChannels 8 wChannelConfig 0x063f Left Front (L) Right Front (R) Center Front (C) Low Freqency Enhancement (LFE) Left Surround (LS) Right Surround (RS) Side Left (SL) Side Right (SR) iChannelNames 0 bmControls 0x00 bmControls 0x00 bmControls 0x00 iMixer 0 junk at descriptor end: 00 00 00 00 00 00 00 00 00 ( 0.229| 0.000) D: [pulseaudio] alsa-mixer.c: Path analog-output-speaker (Speakers), direction=1, priority=100, probed=yes, supported=yes, has_mute=yes, has_volume=yes, has_dB=yes, min_volume=0, max_volume=37, min_dB=0, max_dB=0.14 ( 0.229| 0.000) D: [pulseaudio] alsa-mixer.c: Element Speaker, direction=1, switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=4, required_absent=0, mask=0x7ffffffffffff, n_channels=1, override_map=yes ( 0.229| 0.000) D: [pulseaudio] alsa-mixer.c: Jack Headphone, alsa_name='Headphone Jack', detection unavailable ( 0.229| 0.000) D: [pulseaudio] alsa-mixer.c: Jack Front Headphone, alsa_name='Front Headphone Jack', detection unavailable ( 0.229| 0.000) D: [pulseaudio] alsa-mixer.c: Jack Speaker Phantom, alsa_name='Speaker Phantom Jack', detection unavailable ( 0.229| 0.000) I: [pulseaudio] alsa-sink.c: Successfully enabled synchronous volume. ( 0.229| 0.000) I: [pulseaudio] alsa-sink.c: Hardware volume ranges from 0.00 dB to 0.14 dB. ( 0.230| 0.000) I: [pulseaudio] alsa-sink.c: Fixing base volume to -0.14 dB ( 0.230| 0.000) I: [pulseaudio] alsa-sink.c: Using hardware volume control. Hardware dB scale supported. ( 0.230| 0.000) I: [pulseaudio] alsa-sink.c: Using hardware mute control. For your notebook , pulseaudio just add the ranges of softvol PCM, virtual master and speaker playback volume to get the hardware volume range -178.00 dB to 1.00 dB ( 0.497| 0.000) D: alsa-mixer.c: Activating path analog-output-speaker ( 0.497| 0.000) D: alsa-mixer.c: Path analog-output-speaker (Analog Speakers), direction=1, priority=100, probed=yes, supported=yes, has_mute=yes, has_volume=yes, has_dB=yes, min_volume=0, max_volume=64, min_dB=-178, max_dB=1 ( 0.497| 0.000) D: alsa-mixer.c: Element Master, direction=1, switch=1, volume=1, enumeration=0, required=0, required_absent=0, mask=0x7ffffffffffff, n_channels=1, override_map=yes ( 0.497| 0.000) D: alsa-mixer.c: Element Headphone, direction=1, switch=1, volume=3, enumeration=0, required=0, required_absent=0, mask=0x3ff0000000000006, n_channels=2, override_map=no ( 0.497| 0.000) D: alsa-mixer.c: Element Speaker, direction=1, switch=1, volume=1, enumeration=0, required=4, required_absent=0, mask=0x3ff3600000000f66, n_channels=2, override_map=yes ( 0.498| 0.000) D: alsa-mixer.c: Element PCM, direction=1, switch=0, volume=1, enumeration=0, required=0, required_absent=0, mask=0x3600000000f66, n_channels=2, override_map=yes ( 0.498| 0.000) I: alsa-sink.c: Hardware volume ranges from -178.00 dB to 1.00 dB. ( 0.498| 0.000) I: alsa-sink.c: Fixing base volume to -1.00 dB control.2 { comment.access 'read write' comment.type INTEGER comment.count 2 comment.range '0 - 64' comment.dbmin -6300 comment.dbmax 100 iface MIXER name 'Speaker Playback Volume' value.0 52 value.1 52 } control.4 { comment.access 'read write' comment.type INTEGER comment.count 2 comment.range '0 - 64' comment.dbmin -6300 comment.dbmax 100 iface MIXER name 'Headphone Playback Volume' value.0 63 value.1 63 } control.10 { comment.access 'read write' comment.type INTEGER comment.count 1 comment.range '0 - 64' comment.dbmin -6400 comment.dbmax 0 iface MIXER name 'Master Playback Volume' value 52 } control.12 { comment.access 'read write user' comment.type INTEGER comment.count 2 comment.range '0 - 255' comment.tlv '0000000100000008ffffec1400000014' comment.dbmin -5100 comment.dbmax 0 iface MIXER name 'PCM Playback Volume' value.0 255 value.1 255 it is strange that virtual master playback volume have a different dbmin and dbmax from the slaves (speaker and headphone) -------------- next part -------------- An HTML attachment was scrubbed... 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