/dev/dsp disappeared after power outage

[Bert JW Regeer]

On Feb 4, 2008, at 14:52 , Ulrich Spoerlein wrote:

> On Mon, 04.02.2008 at 13:00:40 -0700, Bert JW Regeer wrote:
>> On Feb 4, 2008, at 08:03 , John Baldwin wrote:
>>> On Saturday 02 February 2008 06:40:15 pm Aryeh M. Friedman wrote:
>>>> I just had a power outage and when it came back /dev/dsp0.0 was
>>>> missing from the devices.   the kern module loaded fine and  
>>>> detected
>>>> the card correctly (according to dmesg, sysctl and /dev/sndstat)  
>>>> but
>>>> neither the above or /dev/pcm exists.  After rebooting the problem
>>>> remains. Any ideas how to fix it?
>>>
>>> Nothing to fix.  This is how devfs device cloning works.
>>
>> Nothing to fix? The sound card that is correctly detected by the  
>> kernel
>> module is not being created in /dev, ONLY after he had a power  
>> outage. It is
>> not even coming back when he reboots the machine.
>>
>> I don't have any suggestions, I just don't believe "Nothing to fix"  
>> is the
>> right answer.
>
> Sigh,
>
> AFAIK dev cloning works by creating the device nodes when open()ed.
> Using 'ls /dev/dsp*' will not open() any devices, so nothing is  
> created.
> He should use 'ls /dev/dsp0 /dev/dsp0.0' and then the devices should
> appear.
>
> Try it for yourself, do 'ls /dev/dsp*' then 'ls /dev/dsp.8'
>
> Not that anything usefull can be done with ls(1) to get sound :)
>
>
> Cheers,
> Ulrich Spoerlein
> -- 
> It is better to remain silent and be thought a fool,
> than to speak, and remove all doubt.


I just booted up my desktop machine at home, I don't have sound  
enabled by default, so I loaded the module that is required. Before  
the module was loaded:

ls -lah /dev/dsp*
ls: No match.

After the module was loaded (I just load snd_driver). Nothing else was  
executed after the module was loaded.

ls -lah /dev/dsp*
crw-rw-rw-  1 root  wheel    0, 106 Jan 26 05:24 /dev/dsp0.0
crw-rw-rw-  1 root  wheel    0, 109 Jan 26 05:24 /dev/dsp0.1
crw-rw-rw-  1 root  wheel    0, 112 Jan 26 05:24 /dev/dsp0.2
crw-rw-rw-  1 root  wheel    0, 115 Jan 26 05:24 /dev/dsp0.3
crw-rw-rw-  1 root  wheel    0, 118 Jan 26 05:24 /dev/dsp0.4
crw-rw-rw-  1 root  wheel    0, 122 Jan 26 05:24 /dev/dsp0.5
crw-rw-rw-  1 root  wheel    0, 107 Jan 26 05:24 /dev/dspW0.0
crw-rw-rw-  1 root  wheel    0, 110 Jan 26 05:24 /dev/dspW0.1
crw-rw-rw-  1 root  wheel    0, 113 Jan 26 05:24 /dev/dspW0.2
crw-rw-rw-  1 root  wheel    0, 116 Jan 26 05:24 /dev/dspW0.3
crw-rw-rw-  1 root  wheel    0, 119 Jan 26 05:24 /dev/dspW0.4
crw-rw-rw-  1 root  wheel    0, 123 Jan 26 05:24 /dev/dspW0.5
crw-rw-rw-  1 root  wheel    0, 121 Jan 26 05:24 /dev/dspr0.4

So what gives?

Bert JW Regeer