| Summary: | Problems with volume control in VIA VT1708B 8-Ch | ||
|---|---|---|---|
| Product: | PulseAudio | Reporter: | Agustín Dall'Alba <agustin> |
| Component: | alsa | Assignee: | pulseaudio-bugs |
| Status: | RESOLVED FIXED | QA Contact: | pulseaudio-bugs |
| Severity: | normal | ||
| Priority: | medium | CC: | lennart |
| Version: | unspecified | ||
| Hardware: | x86-64 (AMD64) | ||
| OS: | Linux (All) | ||
| Whiteboard: | |||
| i915 platform: | i915 features: | ||
| Attachments: | x = alsamixer pecentage for the PCM control. y = corresponding volume in dB. | ||
you have to provide pulseaudio verbose log to show how pulseaidiot caluclate dB when request volume from 100% to 0% Aug 2 19:08:44 encke pulseaudio[2207]: ( 9.204| 9.204) [pulseaudio] protocol-native.c: Client indicator-sound-service changes volume of sink alsa_output.pci-0000_00_1b.0.analog-stereo. Aug 2 19:08:44 encke pulseaudio[2207]: ( 9.205| 0.000) [alsa-sink] alsa-sink.c: Requested volume: 0: 99% 1: 99% Aug 2 19:08:44 encke pulseaudio[2207]: ( 9.205| 0.000) [alsa-sink] alsa-sink.c: in dB: 0: -0.18 dB 1: -0.18 dB Aug 2 19:08:44 encke pulseaudio[2207]: ( 9.205| 0.000) [alsa-sink] alsa-sink.c: Got hardware volume: 0: 100% 1: 100% Aug 2 19:08:44 encke pulseaudio[2207]: ( 9.205| 0.000) [alsa-sink] alsa-sink.c: in dB: 0: 0.00 dB 1: 0.00 dB Aug 2 19:08:44 encke pulseaudio[2207]: ( 9.205| 0.000) [alsa-sink] alsa-sink.c: Calculated software volume: 0: 99% 1: 99% (accurate-enough=yes) Aug 2 19:08:44 encke pulseaudio[2207]: ( 9.205| 0.000) [alsa-sink] alsa-sink.c: in dB: 0: -0.18 dB 1: -0.18 dB Thanks for taking a look at this, it has been fixed (perhaps inadvertently) since I reported it. Have a good day. |
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Created attachment 66151 [details] x = alsamixer pecentage for the PCM control. y = corresponding volume in dB. I have an ASUS P5KPL-1600 motherboard with a VIA VT1708B 8-Ch chip managed by snd-hda-intel. The volume control in pavucontrol, Gnome's sound preferences and all apps with flat-volume enabled is too non-lineal and just plain wrong. alsamixer has two useful controls for output volume: PCM: goes from -40.25dB in 0% through 0dB in 53% to 14dB (*with clipping*) in 100%. (This is not linear at all, see graph.png, attached.) Master: goes from 0dB in 0% (very quiet output) to 6.75dB (without any clipping, loud and clear) in 100% with 0.25dB = 3.75% increments. When, in PulseAudio 2.1, I set the volume in 100% it maxes out both PCM and Master, so I get a quite distorted sound. This is expected, but the scale is wrong: 100% is 0dB but it should be 14dB. The base should be at -14dB, or 58%, when PCM is at 0dB (53%) and Master at 6.75dB (100%), but it is at -20.75dB (45%), with Master and PCM at 0dB, with very quiet output. The difference in sound pressure between 45% and 53% is very large. Between -20.75dB (45%) and -68dB (7%) the volume does not change at all. All controls in alsamixer remain the same. Between -68dB (7%) and -108.24dB (2%) the PCM control goes down to zero, and any less than that results in muted output. This behaviour is quite strange and I don't know how much of it is pulseaudio's fault, how much is the alsa driver's and how much is mine. Thanks.