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Audio - Dummy Output, except for root

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I recently dist-upgraded my Buster/Sid box, and lost:
 - networking temporarily (got it back, but not exactly sure how)
 -video (black screen; no obvious local terminal response, but could ssh
in; it's an NVidia bug apparently, worked around with
"slab_common.usercopy_fallback=y" added to kernel parameters at start-up)
 - audio as a normal user.

So I've fixed the first two issues, but still have no audio when I log into
X as a normal user (or at least as my normal user; now that I think about
it, I'll try as a different normal user as soon as I get this email sent
off).

In both X11/Cinnamon and X11/Plasma Desktop, the audio button on the panel
shows "Dummy Output" as the audio device when I log into X as my normal
user. I added my user to the "audio" group and logged out/in and tried
again; no change.

I then Ctrl-Alt-F1'd to TT1, logged in as root, "systemctl stop sddm", and
"startx &" as root, and the DM was a simpler DM (maybe XFCE? maybe LXDE? it
wasn't obvious, at least to me), and there was not volume control on any
panel, so I just fired up Audacity and played a .m4v file, and audio worked
successfully.

So audio works for root, but not for my normal user (even after being added
to the "audio" group).

Any ideas/suggestions?

Thanks!

-- 
Kent West                    <")))><
Westing Peacefully - http://kentwest.blogspot.com

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Audio - Dummy Output, except for root Kent West <westk@acu.edu> - 2018-06-25 17:00 +0200
  Re: Audio - Dummy Output, except for root Kent West <westk@acu.edu> - 2018-06-25 17:10 +0200
  Re: Audio - Dummy Output, except for root Brian <ad44@cityscape.co.uk> - 2018-06-25 18:00 +0200
    Re: Audio - Dummy Output, except for root Kent West <westk@acu.edu> - 2018-06-25 20:00 +0200
      Re: Audio - Dummy Output, except for root Kent West <westk@acu.edu> - 2018-06-25 21:40 +0200
        Re: Audio - Dummy Output, except for root Kent West <westk@acu.edu> - 2018-06-25 22:50 +0200
          Re: Audio - Dummy Output, except for root Kent West <westk@acu.edu> - 2018-06-25 23:10 +0200
            Re: Audio - Dummy Output, except for root Kent West <westk@acu.edu> - 2018-06-25 23:20 +0200
              Re: Audio - Dummy Output, except for root Kent West <westk@acu.edu> - 2018-06-26 00:00 +0200
                Re: Audio - Dummy Output, except for root Kent West <westk@acu.edu> - 2018-06-26 00:40 +0200
              Re: Audio - Dummy Output, except for root deloptes <deloptes@gmail.com> - 2018-06-26 00:40 +0200

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