Distortions in Left Earphone

So, the first problem I faced experiencing Ubuntu 16.04 for the first time is that when I plugged in my earphones, there is a slight crackling sound in the left earphone.

The problem is related to Realtek’s ALC 295 Audio Device in my HP Pavillion 15 but you can give it a try for other laptops as well.

I searched online for this issue but couldn’t find solution to my problem. It may be because of not-so-appropriate search keywords. But after some days of more research, I finally found the solution to this problem and today I’m going to share it with you.

Steps you need to follow if you are experiencing distortions in your left earphone:

1. First open terminal on your Ubuntu machine using Ctrl+Alt+T.
2. Install alsa and alsa-tools package using this command:                                                     sudo apt-get install -y alsa alsa-tools     and enter your password.
3. Now copy the whole block of following code and press Enter :

   printf '#!/bin/bash
   hda-verb /dev/snd/hwC0D0 0x20 SET_COEF_INDEX 0x67
   hda-verb /dev/snd/hwC0D0 0x20 SET_PROC_COEF 0x3000
   ' > sound-script.sh 
   sudo chmod +x ./sound-script.sh && ./sound-script.sh

   (We are basically creating a bash script to make the necessary changes and then we’ll execute the script every time our system wakes up from suspend or boots.)

4. Now if you’re getting some “permission denied” message simply execute the command:       sudo ./sound-script.sh                                                                                   If not, skip this step.
5. Once, the above commands are executed successfully, check the sound. You can check the sound be searching “Sound” app on your computer and then click on Test Sound.
6. If it resolves the issue, we are good to go. Now we want to make the script run everytime our system wakes up from suspend or boots. Execute the following commands :

   ##Make the script run on wakeup from suspend.
   sudo mv ./sound-script.sh /lib/systemd/system-sleep/

7. Now execute the command and choose the editor by pressing the number on before that editor. Choose the easiest one.                                                                                                     sudo crontab -e
8. After that just add the following line in the end of the file  @reboot /lib/systemd/system-sleep/sound-script.sh
9. Use the shortcut to exit the file and save the file by pressing “Y”.
10. You can check if the cron job was successfully created or not by doing sudo crontab -l which returns a list of user-specified cron jobs.

And that’s how you can say goodbye to that crackling sound.