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The audio only works in high quality when I boot linux with the charger plugged in.
When I boot it only on battery it lost audio quality.
I have already enabled 'lfe-remixing', setted channels to 6 and specified them in pulseaudio files, but the problem still.

How can I set the audio quality to high, regardless of anything?

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I dunno... but just try alsamixer command from terminal... If it didn't work..just ignore –  Venki May 8 at 13:23
    
@Venki, thanks for your tip, but everything is on maximum, but I just got sound on the left side. –  BernardoLima May 8 at 13:47
    
Did sound on battery previously work okay with other operating systems? Which sound card driver are you using and can you try disabling power saving on it - see Pops when starting and stopping playback? –  bain May 8 at 14:46

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