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Re: ALSA bug? Laptop headphone output depending on speaker channel setting

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On Saturday, December 26, 2020 3:48:15 A.M. EST Jan Girke wrote:
> Remove the hdd/ssd from the laptop and use a spare to downgrade until
> you find the version it worked and then compare the two states.

I did more-or-less this, but instead using Debian live-CD images on a USB 
stick, and after some tedium I eventually realized that even the weekly live-
CD of Testing (built yesterday) worked just fine.

After some more searching I figured out what the difference was: the "Loopback 
Mixing" setting in alsamixer. It's apparently disabled by default, but for 
some reason mine had migrated to enabled. Enabling it seems to dictate that 
headphone levels are controlled through the "Speaker+LO" channel instead of 
the "Headphone" channel. Setting it back to disabled, and things are now back 
to normal. Mystery solved!

Best,
Brendon

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ALSA bug? Laptop headphone output depending on speaker channel setting Brendon Higgins <brendon@quantumfurball.net> - 2020-12-24 20:00 +0100
  Re: ALSA bug? Laptop headphone output depending on speaker channel  setting Joel Roth <joelz@pobox.com> - 2020-12-24 22:10 +0100
    Re: Re: ALSA bug? Laptop headphone output depending on speaker channel setting Brendon Higgins <brendon@quantumfurball.net> - 2020-12-25 19:10 +0100
      Re: ALSA bug? Laptop headphone output depending on speaker channel setting Brendon Higgins <brendon@quantumfurball.net> - 2020-12-30 01:50 +0100
        Re: ALSA bug? Laptop headphone output depending on speaker channel setting Nicholas Geovanis <nickgeovanis@gmail.com> - 2020-12-30 02:20 +0100

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