On Friday, February 06, 2015 04:48:09 PM Alexander E. Patrakov wrote:
05.02.2015 02:13, Shawn Starr wrote:
Hello ALSA devs,
I spoke to patrakov on Freenode from the #Alsa IRC channel and they mentioned that the noise background I am experiencing is not normal. I tried two different headsets, both headsets have two separate jacks, the same result.
I will test any patches/quirks for kernel as needed.
Here is the alsa-info:
http://www.alsa-project.org/db/?f=29d3c45e2d66c58be03a10bd0186067a9d735a11
I am not an expert on Intel HDA cards, but... some microphones are picky about the reference voltage supplied by the soundcard. You can change this temporarily, for debugging purposes, with hda-analyzer. See general instructions at
http://www.alsa-project.org/main/index.php/HDA_Analyzer
Note: it needs the "snd-hwdep" module loaded, and needs to be run as root.
In your case, you need to select Node[0x18] PIN in the left pane, and, at the bottom of the right pane, select 50 or 100 instead of 80 in the VREF box. See https://imgur.com/F84raSN for a screenshot based on your alsa-info.
If this doesn't help, just click around randomly. Maybe you'll find the magic checkbox that makes the noise go away and the voice stay :) - if that happens, please email the resulting diff file that hda-analyzer creates.
Hello Alexander,
Indeed, adjusting VREF to 50 cuts the background noise noticeably, it's still there but it is lesser.
Resulting 10 second audio with difference: http://turl.ca/accwc Old audio: http://turl.ca/zrhbcs
Both using same Logitech headset for test.
Thanks, Shawn
-- CUT --
Diff for codec 1/0 (0x10ec0292): --- +++ @@ -189,27 +189,27 @@ Unsolicited: tag=0x02, enabled=1 Power: setting=D0, actual=D0 Connection: 2 0x0c* 0x0d Node 0x17 [Vendor Defined Widget] wcaps 0xf00000: Mono Node 0x18 [Pin Complex] wcaps 0x40058f: Stereo Amp-In Amp-Out Control: name="Front Mic Boost Volume", index=0, device=0 ControlAmp: chs=3, dir=1, idx=0, ofs=0 - Control: name="Front Mic Jack", index=0, device=0 + Control: iface="card", name="Front Mic Jack", index=0, device=0 Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0 Amp-In vals: [0x01 0x01] Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1 Amp-Out vals: [0x80 0x80] Pincap 0x00003734: IN OUT Detect Vref caps: HIZ 50 GRD 80 100 Pin Default 0x02a19031: [Jack] Mic at Ext Front Conn = 1/8, Color = Pink DefAssociation = 0x3, Sequence = 0x1 - Pin-ctls: 0x24: IN VREF_80 + Pin-ctls: 0x21: IN VREF_50 Unsolicited: tag=0x03, enabled=1 Power: setting=D0, actual=D0 Connection: 2 0x0c* 0x0d Node 0x19 [Pin Complex] wcaps 0x40048b: Stereo Amp-In Control: name="Dock Mic Boost Volume", index=0, device=0 ControlAmp: chs=3, dir=1, idx=0, ofs=0 Control: name="Dock Mic Jack", index=0, device=