[Pkg-alsa-devel] Bug#663090: amixer: convert percentage into db wrongly

[Adam Lee]

Package: alsa-utils
Version: 1.0.25-1
Severity: important


db is not linear, but amixer believe it is.

"amixer get Master" says "Limits: Playback 0 - 74", then everytime I run
"amixer -q sset Master 10%-", there is 8db dec.

For example, at first Master is 100% and 0db, both alsamixer and amixer
think it is, and after I run "amixer -q sset Master 10%-", both
alsamixer and amixer says Master is -8.00db, but alsamixer says it is
72%, amixer says it is 89%.

alsamixer is right, amixer calc and set wrongly.

Several months ago, they both right, and I upgraded, and amixer messed
up. Please fix it. Thank you.

FYI, my hardware is:
"HDA-Intel" "Conexant CX20585" "HDA:14f15069,17aa214c,00100302 HDA:14f12c06,17aa2122,00100000" "0x17aa" "0x215e"


-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages alsa-utils depends on:
ii  dialog             1.1-20120215-1
ii  libasound2         1.0.25-2
ii  libc6              2.13-27
ii  libncursesw5       5.9-4
ii  libsamplerate0     0.1.8-3
ii  libtinfo5          5.9-4
ii  linux-sound-base   1.0.23+dfsg-4
ii  lsb-base           3.2+Debian29
ii  module-init-tools  6-1
ii  whiptail           0.52.14-8

Versions of packages alsa-utils recommends:
ii  alsa-base  1.0.23+dfsg-4
ii  pciutils   1:3.1.8-2

alsa-utils suggests no packages.

-- no debconf information