Re: Monitor speakers change which "device" they are

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi George N. White III:
> It would be helpful to have a tutorial "How to manage multiple audio
> devices" using slots.  

Yes!

> The capabilities to get around the order in which devices are
> discovered is there, but the user tools need a higher-level way to
> present and manage the priority and switch between devices.  I
> suspect a really effective solution might require some changes at the
> hardware level to support UUID's that would be the same when a (USB)
> device is moved to a different system.

If I switch on my USB audio device and then read the tail of dmesg, I
see this:

[508825.312474] usb 1-12: new high-speed USB device number 7 using xhci_hcd
[508825.424455] usb 1-12: device descriptor read/64, error -71
[508825.637493] usb 1-12: device descriptor read/64, error -71
[508826.514480] usb 1-12: new high-speed USB device number 8 using xhci_hcd
[508826.638210] usb 1-12: New USB device found, idVendor=1397, idProduct=0503, bcdDevice= 1.00
[508826.638221] usb 1-12: New USB device strings: Mfr=1, Product=3, SerialNumber=2
[508826.638228] usb 1-12: Product: UMC1820
[508826.638235] usb 1-12: Manufacturer: BEHRINGER
[508826.638240] usb 1-12: SerialNumber: 04BBF4FF

If I switch it off, wait, switch it back on again, I see this:

[568753.073218] usb 1-12: USB disconnect, device number 8
[568766.062266] usb 1-12: new high-speed USB device number 9 using xhci_hcd
[568766.174287] usb 1-12: device descriptor read/64, error -71
[568766.387286] usb 1-12: device descriptor read/64, error -71
[568767.264274] usb 1-12: new high-speed USB device number 10 using xhci_hcd
[568767.387993] usb 1-12: New USB device found, idVendor=1397, idProduct=0503, bcdDevice= 1.00
[568767.388004] usb 1-12: New USB device strings: Mfr=1, Product=3, SerialNumber=2
[568767.388011] usb 1-12: Product: UMC1820
[568767.388017] usb 1-12: Manufacturer: BEHRINGER
[568767.388023] usb 1-12: SerialNumber: 04BBF4FF

One would presume there's enough in there to associate the device with
a fixed ID.  Even if it fakes the serial number, it's different from
the other audio hardware in a consistent manner.  Some don't provide
much in the way of useful identifies, but they each use different
drivers:

HDMI audio through the monitor:
[    9.884206] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[    9.890273] snd_hda_intel 0000:00:1f.3: irq 127 for MSI/MSI-X

On-board audio:
[    9.916659] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC892: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:line
[    9.916663] snd_hda_codec_realtek hdaudioC0D0:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[    9.916664] snd_hda_codec_realtek hdaudioC0D0:    hp_outs=1 (0x1b/0x0/0x0/0x0/0x0)
[    9.916665] snd_hda_codec_realtek hdaudioC0D0:    mono: mono_out=0x0
[    9.916666] snd_hda_codec_realtek hdaudioC0D0:    inputs:
[    9.916668] snd_hda_codec_realtek hdaudioC0D0:      Front Mic=0x19
[    9.916669] snd_hda_codec_realtek hdaudioC0D0:      Rear Mic=0x18
[    9.916671] snd_hda_codec_realtek hdaudioC0D0:      Line=0x1a

More about the on-board audio:
[    9.936627] input: HDA Intel PCH Front Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input7
[    9.937820] input: HDA Intel PCH Rear Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input8
[    9.937879] input: HDA Intel PCH Line as /devices/pci0000:00/0000:00:1f.3/sound/card0/input9
[    9.937938] input: HDA Intel PCH Line Out as /devices/pci0000:00/0000:00:1f.3/sound/card0/input10
[    9.937979] input: HDA Intel PCH Front Headphone as /devices/pci0000:00/0000:00:1f.3/sound/card0/input11

More about the HDMI audio:
[    9.938019] input: HDA Intel PCH HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input12
[    9.938060] input: HDA Intel PCH HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input13
[    9.938819] input: HDA Intel PCH HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input14
[    9.939107] input: HDA Intel PCH HDMI/DP,pcm=9 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input15
[    9.939154] input: HDA Intel PCH HDMI/DP,pcm=10 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input16

Outboard USB audio device:
[   10.753506] usbcore: registered new interface driver snd-usb-audio

[508825.312474] usb 1-12: new high-speed USB device number 7 using xhci_hcd
[508825.424455] usb 1-12: device descriptor read/64, error -71
[508825.637493] usb 1-12: device descriptor read/64, error -71
[508826.514480] usb 1-12: new high-speed USB device number 8 using xhci_hcd
[508826.638210] usb 1-12: New USB device found, idVendor=1397, idProduct=0503, bcdDevice= 1.00
[508826.638221] usb 1-12: New USB device strings: Mfr=1, Product=3, SerialNumber=2
[508826.638228] usb 1-12: Product: UMC1820
[508826.638235] usb 1-12: Manufacturer: BEHRINGER
[508826.638240] usb 1-12: SerialNumber: 04BBF4FF

Switching the USB audio device off and on again is often enough to get
the device noticed by my system and sound go over to it.  I'm fortunate
that it's a device with a power switch.  Though I really shouldn't have
to do that.

-- 
 
uname -rsvp
Linux 3.10.0-1160.71.1.el7.x86_64 #1 SMP Tue Jun 28 15:37:28 UTC 2022 x86_64
 
Boilerplate:  All unexpected mail to my mailbox is automatically deleted.
I will only get to see the messages that are posted to the mailing list.
 
_______________________________________________
users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure



[Index of Archives]     [Older Fedora Users]     [Fedora Announce]     [Fedora Package Announce]     [EPEL Announce]     [EPEL Devel]     [Fedora Magazine]     [Fedora Summer Coding]     [Fedora Laptop]     [Fedora Cloud]     [Fedora Advisory Board]     [Fedora Education]     [Fedora Security]     [Fedora Scitech]     [Fedora Robotics]     [Fedora Infrastructure]     [Fedora Websites]     [Anaconda Devel]     [Fedora Devel Java]     [Fedora Desktop]     [Fedora Fonts]     [Fedora Marketing]     [Fedora Management Tools]     [Fedora Mentors]     [Fedora Package Review]     [Fedora R Devel]     [Fedora PHP Devel]     [Kickstart]     [Fedora Music]     [Fedora Packaging]     [Fedora SELinux]     [Fedora Legal]     [Fedora Kernel]     [Fedora OCaml]     [Coolkey]     [Virtualization Tools]     [ET Management Tools]     [Yum Users]     [Yosemite News]     [Gnome Users]     [KDE Users]     [Fedora Art]     [Fedora Docs]     [Fedora Sparc]     [Libvirt Users]     [Fedora ARM]

  Powered by Linux