Bug 863197

Summary: Sound card outputs some sound while the VOLUME is set at ZERO
Product: [Fedora] Fedora Reporter: Andrei ILIE <andrei.ilie>
Component: alsa-firmwareAssignee: Tim Jackson <rpm>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 17CC: jkysela, rpm
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Last Closed: 2012-10-04 18:01:59 UTC Type: Bug
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Description Andrei ILIE 2012-10-04 16:14:51 UTC
Setting volume @ zero doesn't work correctly, as the sound card still outputs some sound. On the other side, muting works ok...


SOLUTION - Upon setting volume @ zero, two things should happen:
  ~ the sound card should be silent;
  ~ the mute flag for the respective chanel should be set system-wide.


$ cat /proc/asound/cards 0
  [Intel ]: HDA-Intel - HDA Intel
  HDA Intel at 0xfe8f4000 irq 45

$ yum list installed *phonon* *alsa*
  alsa-firmware.noarch 1.0.25-1.fc17
  alsa-lib.x86_64 1.0.26-1.fc17
  alsa-lib-debuginfo.x86_64 1.0.26-1.fc17
  alsa-tools-firmware.x86_64 1.0.26.1-1.fc17
  alsa-utils.x86_64 1.0.26-1.fc17
  phonon.x86_64 4.6.0-3.fc17
  phonon-backend-gstreamer.x86_64 2:4.6.2-1.fc17
  phonon-backend-vlc.x86_64 0.6.0-1.fc17

Comment 1 Jaroslav Kysela 2012-10-04 18:01:59 UTC
Mute & volume are two different things. Some hardware does not mute the signal path when the volume register is set to the minimum. Usually, the HDA hardware can have -48dB .. 0dB signal ranges. ALSA copies this.