Bug 70265

Summary: USB headset volume starts at 35%
Product: PulseAudio Reporter: barade.barade
Component: alsaAssignee: pulseaudio-bugs
Status: RESOLVED NOTOURBUG QA Contact: pulseaudio-bugs
Severity: normal    
Priority: medium CC: lennart
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description barade.barade 2013-10-08 00:14:29 UTC
I use pulseaudio 2.1-r1.
As long as no sound is played using flash player on youtube which might use any ALSA wrapper not directly pulseaudio (am I wrong?) sound is muted if volume level is under 35 % for my USB headset.
When I set it to 35 % it has to volume you could expect for 35 % (it's quite loude).
When I watch a video on youtube and the ALSA plugin [plugin-container] playback stream is displayed the whole volume becomes louder (but the value stays at 35 %) AND I am able to set the volume below 35 % how it is supposed to be (its not muted anymore, the volume just gets lower as expected).

This only occurs when using the USB headset not with "Built-in Audi Analog Stereo" output.

Some version details:
alsa-lib 1.0.26-r1
kernel 3.5.7-gentoo


/etc/asound.conf:
pcm.pulse {
    type pulse
}
ctl.pulse {
    type pulse
}

pcm.!default {
        type pulse
}

ctl.!default {
 type pulse
}


This is my USB device:
Bus 001 Device 012: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0d8c C-Media Electronics, Inc.
  idProduct          0x000c Audio Adapter
  bcdDevice            1.00
  iManufacturer           0 
  iProduct                1 C-Media USB Headphone Set  
  iSerial                 0 
  bNumConfigurations      1
Comment 1 barade.barade 2013-10-09 10:15:36 UTC
Adding load-module module-udev-detect ignore_dB=1 seems to fix this but I guess it's still a bug.
Comment 2 Tanu Kaskinen 2013-10-28 11:01:48 UTC
It's most likely a bug in the dB information that ALSA provides to PulseAudio. I'm resolving this bug as NOTOURBUG.
Comment 3 barade.barade 2015-02-10 03:47:03 UTC
Sorry but this bug is still present if it is a bug in the db information where do I have to report it then?
Comment 4 Tanu Kaskinen 2015-02-25 17:49:26 UTC
The alsa-devel mailing list is the best place that I can think of...

(Sorry for slow reply.)

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