[CentOS] How and when are the sound modules loaded at system boot time on CentOS 5?

Rob Kampen rkampen at kampensonline.com
Mon Feb 7 21:55:47 UTC 2011


James Pearson wrote:
> JohnS wrote:
>   
>> On Mon, 2011-02-07 at 19:43 +0000, James Pearson wrote:
>>
>>
>>     
>>> I assume something does probe some how - which is what I trying to work 
>>> out. i.e. what exactly does the probe and where in the startup sequence 
>>> is this done?
>>>       
>>     
See dmesg and check when it finds your pci card and what it indicates is 
loaded for this.
>> I told you already...the kernel calls insmod first...then "init_moule"
>> then a "another sub r gets called to an actual init_module r
>>     
>
> That is how the kernel loads a module when insmod is run - but what 
> tells the system to load the sound modules at system start-up?
>
>   
>> Why not explain exactly your problem?  Theres a reason you need to know
>> and y?
>>     
>
> I have a system with 2 sound 'cards', one on the motherboard and one on 
> a PCI-E card. Both cards use the Intel HDA chipset (snd-hda-intel.ko 
> driver). When the on-board card has been disabled via a jumper, none of 
> the sound modules get loaded at system start-up. I can manually load the 
> snd-hda-intel module and the PCI-E card is found.
>
> Therefore, I would like to find out why the PCI-E card is not found and 
> the driver not loaded at system start-up. Hence my original question, if 
> anyone knows at what point in the start up procedure the system loads 
> the sound modules.
>
> Thanks
>
> James Pearson
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>   
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