17 Dec
2013
17 Dec
'13
1:31 p.m.
I have a new Dell PowerEdge T110 workstation to replace the old T105. Both of
them lack any proper sound hardware so I've got USB speakers.
Some time in the process of replacing the system or the monitor (which is a
USB hub and thus changes USB device assignment) sound stopped working in KDE.
It seems that the main problem is that there is some sort of sound hardware
detected on the motherboard (maybe the built in PC speaker) which causes the
real sound hardware to be registered as ALSA device 1.
So far the only way I've discovered to make things work is to make the
following sym-links to make the USB sound hardware be device 0.
# ls -l /dev/snd
total 0
drwxr-xr-x. 2 root root 60 Dec 9 20:49 by-id
drwxr-xr-x. 2 root root 80 Dec 9 20:49 by-path
lrwxrwxrwx. 1 root root 9 Dec 18 00:05 controlC0 -> controlC1
crw-rw---T. 1 root audio 116, 3 Dec 9 20:49 controlC1
crw-rw---T. 1 root audio 116, 5 Dec 9 20:49 hwC0D0
lrwxrwxrwx. 1 root root 8 Dec 18 00:09 pcmC0D0p -> pcmC1D0p
crw-rw---T. 1 root audio 116, 4 Dec 9 20:49 pcmC0D3p
crw-rw---T. 1 root audio 116, 2 Dec 18 00:09 pcmC1D0p
crw-rw---T. 1 root audio 116, 1 Dec 9 20:49 seq
crw-rw---T. 1 root audio 116, 33 Dec 9 20:49 timer
Is there a way that I can reserve device 0 for the USB device? It needs to be
reserved because the motherboard hardware is detected before the USB bus is
scanned - if the monitor is even turned on when the system is booted.
Is there a way I can make the system just ignore the motherboard device and
have only 1 ALSA card? There's only one thing that can ever be useful so it
seems best to make it the only recognised card in the system.
Thanks
--
My Main Blog http://etbe.coker.com.au/
My Documents Blog http://doc.coker.com.au/
17 Dec
17 Dec
10:37 p.m.
Russell Coker <russell(a)coker.com.au> wrote:
Is there a way that I can reserve device 0 for the USB
device?
You can specify it as in the following examples:
options snd_usb_audio index=1
options snd_hda_intel index=0
I created a file for this: /etc/modprobe.d/sound-devices.conf. Essentially, it
specifies parameters to the kernel modules as they are loaded.
18 Dec
18 Dec
12:44 a.m.
Jason White <jason(a)jasonjgw.net> writes:
Russell Coker <russell(a)coker.com.au> wrote:
Assuming your (OP's) diagnosis is correct, you can also blacklist the
pcspkr module in /etc/modprobe.conf.d/foo.conf
blacklist foo
prevents it being loaded automatically,
install foo /bin/false
prevents it being loaded at all.
Is there a way that I can reserve device 0 for
the USB device?
You can specify it as in the following examples:
options snd_usb_audio index=1
options snd_hda_intel index=0
I created a file for this: /etc/modprobe.d/sound-devices.conf. Essentially, it
specifies parameters to the kernel modules as they are loaded.
5:48 a.m.
Trent W. Buck <trentbuck(a)gmail.com> wrote:
Assuming your (OP's) diagnosis is correct, you can
also blacklist the
pcspkr module in /etc/modprobe.conf.d/foo.conf
Interestingly, pcspkr is loaded here, but there's no corresponding ALSA
device: the only ALSA devices are for true sound cards.
Try running aplay -l to identify the relevant hardware. It should be easy
enough to find the pertinent kernel module.
11:25 p.m.
Jason White <jason(a)jasonjgw.net> writes:
Trent W. Buck <trentbuck(a)gmail.com> wrote:
IIRC when I ran into this, my card wasn't loading soon enough, so I
*think* the kernel (or ALSA) went "ruh roh, no cards, I'll fall back to
pcspkr" and then later the card arrived, so I had amixer -c0 was pcspkr
and amixer -c1 was the real sound card.
YMMV &c
Assuming your (OP's) diagnosis is correct,
you can also blacklist the
pcspkr module in /etc/modprobe.conf.d/foo.conf
Interestingly, pcspkr is loaded here, but there's no corresponding ALSA
device: the only ALSA devices are for true sound cards. 
27 Dec
27 Dec
7:39 a.m.
I love how your kernel talks like Scooby Doo Trent.
On Dec 19, 2013 10:26 AM, "Trent W. Buck" <trentbuck(a)gmail.com> wrote:
Jason White <jason(a)jasonjgw.net> writes:
Trent W. Buck <trentbuck(a)gmail.com> wrote:
IIRC when I ran into this, my card wasn't loading soon enough, so I
*think* the kernel (or ALSA) went "ruh roh, no cards, I'll fall back to
pcspkr" and then later the card arrived, so I had amixer -c0 was pcspkr
and amixer -c1 was the real sound card.
YMMV &c
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luv-main(a)luv.asn.au
http://lists.luv.asn.au/listinfo/luv-main
Assuming your (OP's) diagnosis is correct,
you can also blacklist the
pcspkr module in /etc/modprobe.conf.d/foo.conf
Interestingly, pcspkr is loaded here, but there's no corresponding ALSA
device: the only ALSA devices are for true sound cards.
7:16 a.m.
On Wed, 18 Dec 2013, Jason White <jason(a)jasonjgw.net> wrote:
Russell Coker <russell(a)coker.com.au> wrote:
http://etbe.coker.com.au/2013/12/27/sound-device-order-with-alsa/
Thanks for the suggestions, Jason's idea was the one I ended up using. I
wrote about it at the above URL.
--
My Main Blog http://etbe.coker.com.au/
My Documents Blog http://doc.coker.com.au/
Is there a way that I can reserve device 0 for
the USB device?
You can specify it as in the following examples:
options snd_usb_audio index=1
options snd_hda_intel index=0
I created a file for this: /etc/modprobe.d/sound-devices.conf. Essentially,
it specifies parameters to the kernel modules as they are loaded.
30 Dec
30 Dec
1:09 a.m.
Russell Coker <russell(a)coker.com.au> wrote:
On Wed, 18 Dec 2013, Jason White
<jason(a)jasonjgw.net> wrote:
The same effect can be achieved by a udev rule, which is perhaps the better
long-term solution. I haven't read up on udev sufficiently to be able to write
it.
I created a file for this:
/etc/modprobe.d/sound-devices.conf. Essentially,
it specifies parameters to the kernel modules as they are loaded.
http://etbe.coker.com.au/2013/12/27/sound-device-order-with-alsa/
Thanks for the suggestions, Jason's idea was the one I ended up using. I
wrote about it at the above URL. 
17 Dec
17 Dec
11:53 p.m.
I just have pulseaudio and alsa configured to route all the sound to
all the devices, so it doesn't matter which one has my headphones
plugged in.. seems like a simpler solution?
On 18 December 2013 00:31, Russell Coker <russell(a)coker.com.au> wrote:
I have a new Dell PowerEdge T110 workstation to
replace the old T105. Both of
them lack any proper sound hardware so I've got USB speakers.
Some time in the process of replacing the system or the monitor (which is a
USB hub and thus changes USB device assignment) sound stopped working in KDE.
It seems that the main problem is that there is some sort of sound hardware
detected on the motherboard (maybe the built in PC speaker) which causes the
real sound hardware to be registered as ALSA device 1.
So far the only way I've discovered to make things work is to make the
following sym-links to make the USB sound hardware be device 0.
# ls -l /dev/snd
total 0
drwxr-xr-x. 2 root root 60 Dec 9 20:49 by-id
drwxr-xr-x. 2 root root 80 Dec 9 20:49 by-path
lrwxrwxrwx. 1 root root 9 Dec 18 00:05 controlC0 -> controlC1
crw-rw---T. 1 root audio 116, 3 Dec 9 20:49 controlC1
crw-rw---T. 1 root audio 116, 5 Dec 9 20:49 hwC0D0
lrwxrwxrwx. 1 root root 8 Dec 18 00:09 pcmC0D0p -> pcmC1D0p
crw-rw---T. 1 root audio 116, 4 Dec 9 20:49 pcmC0D3p
crw-rw---T. 1 root audio 116, 2 Dec 18 00:09 pcmC1D0p
crw-rw---T. 1 root audio 116, 1 Dec 9 20:49 seq
crw-rw---T. 1 root audio 116, 33 Dec 9 20:49 timer
Is there a way that I can reserve device 0 for the USB device? It needs to be
reserved because the motherboard hardware is detected before the USB bus is
scanned - if the monitor is even turned on when the system is booted.
Is there a way I can make the system just ignore the motherboard device and
have only 1 ALSA card? There's only one thing that can ever be useful so it
seems best to make it the only recognised card in the system.
Thanks
--
My Main Blog http://etbe.coker.com.au/
My Documents Blog http://doc.coker.com.au/
_______________________________________________
luv-main mailing list
luv-main(a)luv.asn.au
http://lists.luv.asn.au/listinfo/luv-main
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The falcon cannot hear the falconer
Things fall apart; the center cannot hold
Mere anarchy is loosed upon the world
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8 comments
5 participants
participants (5)
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Jason White -
Russell Coker -
thelionroars -
Toby Corkindale -
trentbuck＠gmail.com