After installing 12.04 Precise on my PC, I have encountered some problems with audio output which did no occur when using Lucid.

The sound is choppy and distorted in the lower tones. As I have no experience in setting/testing and doing anything with Audio Devices, I need help even to diagnose the problem.


$ sudo lshw -c multimedia


       description: Audio device
       product: Radeon X1200 Series Audio Controller
       vendor: Hynix Semiconductor (Hyundai Electronics)
       physical id: 5.2
       bus info: pci@0000:01:05.2
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi bus_master cap_list
       configuration: driver=snd_hda_intel latency=32
       resources: irq:19 memory:fdafc000-fdafffff
       description: Audio device
       product: SBx00 Azalia (Intel HDA)
       vendor: Hynix Semiconductor (Hyundai Electronics)
       physical id: 14.2
       bus info: pci@0000:00:14.2
       version: 00
       width: 64 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list
       configuration: driver=snd_hda_intel latency=32
       resources: irq:16 memory:fe024000-fe027fff

Update 2

It has something to do with the volume. If the audio is quiet it is not choppy, if the sound is loud then it begins to be choppy.

  • Sorry, what do you mean by "low range"? Doesn't the choppiness and distortion affect all audio?
    – ish
    May 17 '12 at 8:21
  • The sound is choppy in general, and distorted for low range tones only. For me it seems like some buffering problem, or something similar.
    – Misery
    May 17 '12 at 8:23
  • 1
    Please update question with pastebin of sudo lshw -c multimedia.
    – ish
    May 17 '12 at 8:29
  • 1
    I have this same problem... bassy sounds cause chopping/stuttering of playback in videos/audio. turning the volume down low reduces the choppiness. I can't listen to mp3 or watch vlc without sound freaking out. (snd_hda_intel driver for 6/C200 series Intel)
    – beanaroo
    May 18 '12 at 10:05

Misery, I seem to have found a solution on my system using the same driver (different audio device though)

  1. Open Terminal: gksudo gedit /etc/modprobe.d/alsa-base.conf
  2. Add the following line:

    options snd-hda-intel model=generic
  3. Restart System

My audio seems to be working fine now. Full volume, flash content, videos, audio files. Let us know if it helps.

Credit goes to Adityeah

  • it did the thing :]
    – Misery
    May 21 '12 at 7:07
  • This has not helped me get sound working correctly in Steam. (For future Googlers)
    – earthmeLon
    Nov 15 '13 at 18:32
  • @earthmeLon This solution is for a problem that is system-wide. Not limited to one application. Sorry.
    – beanaroo
    Nov 17 '13 at 8:43
  • hey this did not worked for me ? i have intel i5 2nd generation Dell with IDT speakers Nov 15 '14 at 13:28
  • I'll have to test this.
    – Elder Geek
    Jan 20 '18 at 22:01

A possible solution is disabling "auto-mute" in alsamixer. It is used when the "switch-to-headphone-and-back-again" bug occurs (in high volumes mainly).

First, open your terminal, or press:


Then, type and hit "enter":

$ alsamixer

This screen will show up:

Alsa mixer screen in terminal

Use the right arrow until you select "Auto-Mute"

Next, press the down arrow to set it do "Disable" (see the text above it).

Finally, press Esc to apply and exit

That's it.


Install alsa-tools:

sudo apt install alsa-tools

Create and save a script in /usr/local/bin:

sudo vi /usr/local/bin/sound_fix.sh

Inside the script, write this:

hda-verb /dev/snd/hwC0D0 0x20 SET_COEF_INDEX 0x67
hda-verb /dev/snd/hwC0D0 0x20 SET_PROC_COEF 0x3000

Run the script as root in a terminal to immediately fix the problem.

Give permission to run using:

sudo chmod 700 [path_to_script_folder]/sound_fix.sh

Run the script using:


To run the script on startup, use cron with the @reboot command:

sudo crontab -e

and then add line in crontab:

@reboot [full_path_to_script_folder]/sound_fix.sh

To run script on resume from suspend, copy the script to


For more technical details regarding this fix, check this link.

  • perfect answer, working for 18.04 Jan 23 '20 at 18:32
  • upgraded to Ubuntu 20.04, same problem, working for that too. Jan 8 '21 at 14:38

For crackling noise in headphones especially on the left side.. write a bash script with the following lines

hda-verb /dev/snd/hwC0D0 0x20 SET_COEF_INDEX 0x67
hda-verb /dev/snd/hwC0D0 0x20 SET_PROC_COEF 0x3000

Don't forget to execute it as root.

And for systems which don't have hda-verb installed, you can install hda-verb from the respective package managers

Add the script to the startup scripts or there will be a neccesity to run the script everytime system boots up

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