I have installed elementaryOS on my Huawei Matebook D. This laptop has a Dolby Atmos Audio-Soundsystem with 4 speakers. With the Linux installation, the speakers are much quieter and sound much worse.
Any way to fix this?
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I have the Matebook Pro X and had the same issue. In my case only two of the four speakers worked (bottom worked top didn't) after installing elementary OS and a few other distros. I was able to find information that allowed me to get get the top two speakers working and now it sounds great. If your top two speakers are not working this may apply to the Matebook D as well.
sudo apt install alsa-tools alsa-tools-gui pavucontrol
sudo update-initramfs -u