Launchpad has imported 1 comments from the remote bug at https://bugs.freedesktop.org/show_bug.cgi?id=54096.
If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. ------------------------------------------------------------------------ On 2012-08-26T20:00:30+00:00 Agustin-6 wrote: Created attachment 66151 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. Reply at: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1210129/comments/0 ** Changed in: pulseaudio Status: Unknown => Confirmed ** Changed in: pulseaudio Importance: Unknown => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1210129 Title: Pulseaudio does not recognize sound levels correctly. To manage notifications about this bug go to: https://bugs.launchpad.net/pulseaudio/+bug/1210129/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
