Problem: laptop's speakers sound quality is much worse than in windows. How to address this issue in Ubuntu 18.04?


According to https://forum.manjaro.org/t/solved-terrible-sound-in-linux-much-better-in-windows/8203/6 and http://www.alsa-project.org/main/index.php/Asoundrc

We have to do some manual settings editing on pulse audio config. The path is /etc/pulse/daemon.conf. Open a terminal by pressing ctrl+alt+c. First of all, backup the configuration file:

sudo cp /etc/pulse/daemon.conf /etc/pulse/daemon.conf.backup

Then type sudo nano /etc/pulse/daemon.conf

(If your file is empty, it means the file you are looking for is not in this directory. In this case, try to locate it: sudo updatedb, this will update your files database index. Then type locate daemon.conf to find the file location. Replace /etc/pulse/ with the path to your daemon.conf file)

Find the following lines (ctrl+w to find text in file) and replace your values with the following (lines might be in a different order in your system):

default-sample-format = float32ne
default-sample-rate = 48000
alternate-sample-rate = 44100
default-sample-channels = 2
default-channel-map = front-left,front-right

default-fragments = 2
default-fragment-size-msec = 125
resample-method = speex-float-5 
enable-lfe-remixing = no
high-priority = yes
nice-level = -11
realtime-scheduling = yes
realtime-priority = 9
rlimit-rtprio = 9
rlimit-rttime = -1
daemonize = no

Press ctrl+o to save changes, then press ctrl+x to quit

now type nano ~/.asoundrc in terminal and paste te following code:

pcm.!default {
    type plug
    slave.pcm hw

This will bypass dmix for pulseaudio increasing sound quality by a lot. We can’t have more than one resampler because if we do it gets resampled twice and some sound quality is lost (as explained by Calthax in this thread).

Credits to Calthax and AlsaProject wiki page.

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