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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.

  1. In a terminal install alsa-tools

sudo apt install alsa-tools alsa-tools-gui

  1. In the terminal run the hdajackretask utility

hdajackretask

  1. Once the GUI opens choose "Realtek ALC256" in the "Selecta a codec" dropdown

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  1. Check the "Show unconnected pins" and "Advanced override" boxes under "Options"

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  1. You should see a list of pins under "Pin configuration" with identifiers like "Pin ID: 0x14". You will need to override two of them, "0x14" and "0x1b". Check the "Override" box on both of them and set all of the values as shown below.

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And

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  1. Click "Apply now" and test the speakers. If they work click on "Install boot override"
  2. Rebuild your initramfs with the command below then reboot

sudo mkinitcpio -P or update-initramfs -u

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