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Today I bought a new gaming headset (Gx-Gaming Lychas), and when I tried to record some gameplay-comentary I noticed that there always is a static background noise, I just recorded an example so you guys can listen it (no downloaded needed):

http://www47.zippyshare.com/v/65167832/file.html

I'm using Kubuntu 13.04 and Kernel version is 3.8.0-19, my laptop is an Acer Travelmate 5760Z, I tried tons of configurations on Alsamixer and none of them made result, I really need to get this working so any kind of help will be very aprecciated.

cat /proc/asound/cards:

 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xc6400000 irq 44

cat /proc/asound/card0/codec#0

Codec: Conexant CX20588
Address: 0
AFG Function Id: 0x1 (unsol 1)
Vendor Id: 0x14f1506c
Subsystem Id: 0x10250574
Revision Id: 0x100003
No Modem Function Group found
Default PCM:
    rates [0x160]: 44100 48000 96000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
Default Amp-In caps: N/A
Default Amp-Out caps: N/A
State of AFG node 0x01:
  Power states:  D0 D1 D2 D3 D3cold CLKSTOP EPSS
  Power: setting=D0, actual=D0
GPIO: io=4, o=0, i=0, unsolicited=1, wake=0
  IO[0]: enable=0, dir=0, wake=0, sticky=0, data=0, unsol=0
  IO[1]: enable=0, dir=0, wake=0, sticky=0, data=0, unsol=0
  IO[2]: enable=0, dir=0, wake=0, sticky=0, data=0, unsol=0
  IO[3]: enable=0, dir=0, wake=0, sticky=0, data=0, unsol=0
Node 0x10 [Audio Output] wcaps 0xc1d: Stereo Amp-Out R/L
  Control: name="Headphone Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Headphone Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Device: name="CX20588 Analog", type="Audio", device=0
  Amp-Out caps: ofs=0x4a, nsteps=0x4a, stepsize=0x03, mute=1
  Amp-Out vals:  [0x4a 0x4a]
  Converter: stream=8, channel=0
  PCM:
    rates [0x560]: 44100 48000 96000 192000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
Node 0x11 [Audio Output] wcaps 0xc1d: Stereo Amp-Out R/L
  Control: name="Speaker Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Speaker Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Amp-Out caps: ofs=0x4a, nsteps=0x4a, stepsize=0x03, mute=1
  Amp-Out vals:  [0x80 0x80]
  Converter: stream=8, channel=0
  PCM:
    rates [0x560]: 44100 48000 96000 192000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
Node 0x12 [Audio Output] wcaps 0x611: Stereo Digital
  Converter: stream=0, channel=0
  Digital:
  Digital category: 0x0
  IEC Coding Type: 0x0
  PCM:
    rates [0x160]: 44100 48000 96000
    bits [0xe]: 16 20 24
    formats [0x5]: PCM AC3
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
Node 0x13 [Beep Generator Widget] wcaps 0x70000c: Mono Amp-Out
  Control: name="Beep Playback Volume", index=0, device=0
    ControlAmp: chs=1, dir=Out, idx=0, ofs=0
  Control: name="Beep Playback Switch", index=0, device=0
    ControlAmp: chs=1, dir=Out, idx=0, ofs=0
  Amp-Out caps: ofs=0x07, nsteps=0x07, stepsize=0x0f, mute=0
  Amp-Out vals:  [0x00]
Node 0x14 [Audio Input] wcaps 0x100d1b: Stereo Amp-In R/L
  Control: name="Capture Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Capture Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Device: name="CX20588 Analog", type="Audio", device=0
  Amp-In caps: ofs=0x4a, nsteps=0x50, stepsize=0x03, mute=1
  Amp-In vals:  [0x50 0x50] [0x80 0x80] [0x80 0x80] [0x80 0x80]
  Converter: stream=4, channel=0
  SDI-Select: 0
  PCM:
    rates [0x160]: 44100 48000 96000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 4
     0x17* 0x18 0x23 0x24
Node 0x15 [Audio Input] wcaps 0x100d1b: Stereo Amp-In R/L
  Amp-In caps: ofs=0x4a, nsteps=0x50, stepsize=0x03, mute=1
  Amp-In vals:  [0x4a 0x4a] [0x4a 0x4a] [0x4a 0x4a] [0x4a 0x4a]
  Converter: stream=0, channel=0
  SDI-Select: 0
  PCM:
    rates [0x160]: 44100 48000 96000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 4
     0x17* 0x18 0x23 0x24
Node 0x16 [Audio Input] wcaps 0x100d1b: Stereo Amp-In R/L
  Amp-In caps: ofs=0x4a, nsteps=0x50, stepsize=0x03, mute=1
  Amp-In vals:  [0x4a 0x4a] [0x4a 0x4a] [0x4a 0x4a] [0x4a 0x4a]
  Converter: stream=0, channel=0
  SDI-Select: 0
  PCM:
    rates [0x160]: 44100 48000 96000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 4
     0x17* 0x18 0x23 0x24
Node 0x17 [Audio Selector] wcaps 0x30050d: Stereo Amp-Out
  Control: name="Mic Boost Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Amp-Out caps: ofs=0x00, nsteps=0x04, stepsize=0x27, mute=0
  Amp-Out vals:  [0x04 0x04]
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 4
     0x1a 0x1b* 0x1d 0x1e
Node 0x18 [Audio Selector] wcaps 0x30050d: Stereo Amp-Out
  Amp-Out caps: ofs=0x00, nsteps=0x04, stepsize=0x27, mute=0
  Amp-Out vals:  [0x00 0x00]
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 4
     0x1a* 0x1b 0x1d 0x1e
Node 0x19 [Pin Complex] wcaps 0x400581: Stereo
  Control: name="Headphone Jack", index=0, device=0
  Pincap 0x0000001c: OUT HP Detect
  Pin Default 0x04214040: [Jack] HP Out at Ext Right
    Conn = 1/8, Color = Green
    DefAssociation = 0x4, Sequence = 0x0
  Pin-ctls: 0xc0: OUT HP
  Unsolicited: tag=01, enabled=1
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 2
     0x10* 0x11
Node 0x1a [Pin Complex] wcaps 0x400481: Stereo
  Control: name="Internal Mic Phantom Jack", index=0, device=0
  Pincap 0x00001324: IN Detect
    Vref caps: HIZ 50 80
  Pin Default 0x90a70130: [Fixed] Mic at Int N/A
    Conn = Analog, Color = Unknown
    DefAssociation = 0x3, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x24: IN VREF_80
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
Node 0x1b [Pin Complex] wcaps 0x400581: Stereo
  Control: name="Mic Jack", index=0, device=0
  Pincap 0x00011334: IN OUT EAPD Detect
    Vref caps: HIZ 50 80
  EAPD 0x0:
  Pin Default 0x04a19020: [Jack] Mic at Ext Right
    Conn = 1/8, Color = Pink
    DefAssociation = 0x2, Sequence = 0x0
  Pin-ctls: 0x24: IN VREF_80
  Unsolicited: tag=02, enabled=1
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 2
     0x10* 0x11
Node 0x1c [Pin Complex] wcaps 0x400581: Stereo
  Pincap 0x00000014: OUT Detect
  Pin Default 0x40f001f0: [N/A] Other at Ext N/A
    Conn = Unknown, Color = Unknown
    DefAssociation = 0xf, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x40: OUT
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 2
     0x10* 0x11
Node 0x1d [Pin Complex] wcaps 0x400581: Stereo
  Pincap 0x00010034: IN OUT EAPD Detect
  EAPD 0x0:
  Pin Default 0x40f001f0: [N/A] Other at Ext N/A
    Conn = Unknown, Color = Unknown
    DefAssociation = 0xf, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x40: OUT
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 2
     0x10* 0x11
Node 0x1e [Pin Complex] wcaps 0x400481: Stereo
  Pincap 0x00000024: IN Detect
  Pin Default 0x40f001f0: [N/A] Other at Ext N/A
    Conn = Unknown, Color = Unknown
    DefAssociation = 0xf, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x00:
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
Node 0x1f [Pin Complex] wcaps 0x400501: Stereo
  Control: name="Speaker Phantom Jack", index=0, device=0
  Pincap 0x00000010: OUT
  Pin Default 0x92170110: [Fixed] Speaker at Int Front
    Conn = Analog, Color = Unknown
    DefAssociation = 0x1, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x40: OUT
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 2
     0x10 0x11*
Node 0x20 [Pin Complex] wcaps 0x400781: Stereo Digital
  Pincap 0x00000010: OUT
  Pin Default 0x40f001f0: [N/A] Other at Ext N/A
    Conn = Unknown, Color = Unknown
    DefAssociation = 0xf, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x00:
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 1
     0x12
Node 0x21 [Audio Output] wcaps 0x611: Stereo Digital
  Converter: stream=0, channel=0
  Digital:
  Digital category: 0x0
  IEC Coding Type: 0x0
  PCM:
    rates [0x160]: 44100 48000 96000
    bits [0xe]: 16 20 24
    formats [0x5]: PCM AC3
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
Node 0x22 [Pin Complex] wcaps 0x400781: Stereo Digital
  Pincap 0x00000010: OUT
  Pin Default 0x40f001f0: [N/A] Other at Ext N/A
    Conn = Unknown, Color = Unknown
    DefAssociation = 0xf, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x00:
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 1
     0x21
Node 0x23 [Pin Complex] wcaps 0x40040b: Stereo Amp-In
  Amp-In caps: ofs=0x00, nsteps=0x04, stepsize=0x2f, mute=0
  Amp-In vals:  [0x00 0x00]
  Pincap 0x00000020: IN
  Pin Default 0x40f001f0: [N/A] Other at Ext N/A
    Conn = Unknown, Color = Unknown
    DefAssociation = 0xf, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x00:
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
Node 0x24 [Audio Mixer] wcaps 0x20050b: Stereo Amp-In
  Amp-In caps: ofs=0x4a, nsteps=0x4a, stepsize=0x03, mute=1
  Amp-In vals:  [0x00 0x00] [0x00 0x00]
  Power states:  D0 D1 D2 D3 D3cold EPSS
  Power: setting=D0, actual=D0
  Connection: 2
     0x10 0x11
Node 0x25 [Vendor Defined Widget] wcaps 0xf00000: Mono
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1  
If you can record the background noise in the software, then it's likely that your microphone is turned on for the "play" mixer. Have you tried opening alsamixer (terminal) and mute the microphone? (press M on the right slider) –  gertvdijk Jun 23 '13 at 12:26
    
Do you have the same "hum"-noise when running on battery ? –  thom Jun 25 '13 at 14:03

4 Answers 4

You have to modify the following line in /etc/pulse/default.pa:

Change

load-module module-udev-detect
to :
load-module module-udev-detect tsched=0

You can refer to this link :
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/751265/comments/23

I hope that this will help you.

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It is possible that that static is coming from your motherboard. Try using USB headphones so that you don't get interference from the motherboard.

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A recent update to the pulseaudio package included with Ubuntu 13.04 (Raring Ringtail) and Kubuntu 13.04 may be causing some users to experience a persistent background noise, or hum. It appears that this particular bug will affect VLC, Skype, and possibly other applications which emit audio. This problem is primarily affecting Intel-HDA (high definition audio) chipsets and ALSA sound drivers in regards to "glitch-free" PA (pulse audio).

Source: Ubuntu Linux Knowhow

**bug 751265

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I had a similar problem with lots of noise that would vary with scrolling and other activities. I opened alsamixer and turned down "Beep", and the noise went away.

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