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Accepted
Kushal
Asked: 2017-05-01 04:12:05 +0800 CST

Distorted audio over headphones in Ubuntu 17.04 dual booted with Windows 10

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Overview

I have Ubuntu GNOME 17.04 installed along side Windows 10 on my HP Pavilion 15 AU113TX laptop. Sometimes when I switch to Ubuntu from Windows, I get distorted audio from left earphone while listening to anything.

This issue is intermittent as sometimes audio comes out just fine right after I booted to Ubuntu, however it starts causing problems again if I put Ubuntu to sleep and wake it up after couple of hours. On Windows 10, however, audio works perfectly even after reboots from Ubuntu or after waking up from sleep.

Affected Ubuntu Version

While I'm tagging 17.04 with the question, this issue occurred Ubuntu 16.10 as well, I haven't tried 16.04 though, since it originally shipped with Kernel 4.4 which doesn't have very good support for Kaby Lake chipset (which my laptop has).

Tried Solutions

I did go through Ubuntu's Audio Troubleshoot Guide but it didn't fix my problem. There are 3 related questions;

  1. Distorted and Choppy Audio
  2. Choppy and Distorted Audio
  3. How can I fix choppy audio?

Unfortunately, none of those questions mention dual boot scenario and neither the solution they propose fix the problem.

Diagnostic Information

Output for command sudo lshw -c multimedia

    *-usb:1                   
           description: Video
           product: HP Wide Vision HD
           vendor: DFKAR019I333QL
           physical id: 3
           bus info: usb@1:3
           version: 0.04
           capabilities: usb-2.00
           configuration: driver=uvcvideo maxpower=500mA speed=480Mbit/s
    *-multimedia
           description: Audio device
           product: Intel Corporation
           vendor: Intel Corporation
           physical id: 1f.3
           bus info: pci@0000:00:1f.3
           version: 21
           width: 64 bits
           clock: 33MHz
           capabilities: pm msi bus_master cap_list
           configuration: driver=snd_hda_intel latency=32
           resources: irq:135 memory:b4328000-b432bfff memory:b4310000-b431ffff

Any help in fixing this would be appreciated, also let me know if I need to put output for any more commands. Thanks!

dual-boot

2 Answers

  1. I had the same issue. Give this a shot it ended up working for me

    sudo apt-get remove --purge alsa-base pulseaudio
sudo apt-get install alsa-base pulseaudio
sudo alsa force-reload
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  2. Best Answer

    It turns out that there's a bug with HP audio driver which causes this problem. I could successfully fix it with following solution. Note that this solution is applicable only if your audio device is Realtek ALC295.

    Install alsa-tools if not installed:

    sudo apt install alsa-tools

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

    #!/bin/bash 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.

    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]

    To run script on resume from suspend, copy the script to /lib/systemd/system-sleep

    source: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1648183/comments/17

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