[Pkg-alsa-devel] Bug#913045: libasound2: ALSA lib pcm_dmix.c:1099:(snd_pcm_dmix_open) unable to open slave

[Pedro Silva]

On Thu, 8 Nov 2018 22:00:03 +0000 Pedro Silva <pedrofsilva at netcabo.pt>
wrote:
> On Thu, 8 Nov 2018 19:59:56 +0100 Elimar Riesebieter <riesebie at lxtec.de>
> wrote:
> > >
> > > With the $HOME/.asoundrc, pointed to card 2, the sound is back and
fully
> > > working, thank you.
> > >
> > > You mean that a minor revision to this package caused it to now
require
> > > a manual configuration file?  Why?
> >
> > Hmm, the priority of the sequence of sond devices is done by the
> > kernel (udev|systemd). If you are interested please run a test as
> > follows:
> >
> > Unplug your usb device and reboot. After reboot plug in your usb
> > device and run 'cat /proc/asound/cards'.
> >
> >
> > Boot with a plugged in usb device and run 'cat /proc/asound/cards'.
> >
> > Is there any difference?
> >
> > Elimar
> > --
> > You cannot propel yourself forward by
> > patting yourself on the back.
>
>
> No difference.
>
> As the original bug reporter, please understand that my knowledge of
> Alsa is also limited.
>
> Unplug, reboot, plug, $ cat /proc/asound/cards >
> libasound2bug_reboot_thenplug.txt.
> Reboot.
>
> $ cat /proc/asound/cards
>  0 [HDMI           ]: HDA-Intel - HDA ATI HDMI
>                       HDA ATI HDMI at 0xfe960000 irq 67
>  1 [Generic        ]: HDA-Intel - HD-Audio Generic
>                       HD-Audio Generic at 0xfe800000 irq 69
>  2 [USB            ]: USB-Audio - Razer Kraken USB
>                       Razer Razer Kraken USB at usb-0000:09:00.3-4.3,
> full speed
>
> $ diff /proc/asound/cards libasound2bug_reboot_thenplug.txt
> [no output]
>
> My concern is the "it worked before". Anything else besides Alsa and the
> kernel that could cause this issue?
>
> Best regards,
> Pedro Silva

This is getting weird.

Even with the $HOME/.asoundrc file, I've nailed it down to not being
able to play two sound sources at the same time.

Reboot with USB card plugged, login, run game, sound works. Open browser
(firefox), open youtube, play video, doesn't play, hangs playback until
I close the game.

Close browser and game, start browser and play youtube video, everything
ok. Start game, no error message (as the subject of this bug) but no
sound whatsoever.

Needless to say that none of this happened before the upgrade. I haven't
tried to downgrade libasound2 to previous version, but I can if it helps
troubleshooting.

Best regards,
Pedro Silva