-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of m.roth@5-cent.us Sent: Monday, February 07, 2011 12:41 PM To: CentOS mailing list Subject: Re: [CentOS] How and when are the sound modules loaded at system boot time on CentOS 5?

James Pearson wrote:

...

I've been trying to work out how the various sound modules

get loaded

...

at boot time on CentOS 5 - but I can't find anything obvious under /etc/rc.d/

CentOS 4 did this in /etc/rc.d/rc.sysinit - but there is nothing equivalent in CentOS 5

Does anyone know how these modules get loaded?

Have you tried system-config-soundcard?

It's pretty clear he's asking a question with an answer like:

"rc.sysinit->modprobe -a (assuming the correct aliases in /etc/modprobe.conf list the proper sound modules)"

Since my embedded headless CentOS target is also mute, I never worried the question and don't know the exact answer.

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James Pearson wrote:

m.roth@5-cent.us wrote:

...

James Pearson wrote:

...

I've been trying to work out how the various sound modules get loaded at boot time on CentOS 5 - but I can't find anything obvious under /etc/rc.d/

CentOS 4 did this in /etc/rc.d/rc.sysinit - but there is nothing equivalent in CentOS 5

Does anyone know how these modules get loaded?

Have you tried system-config-soundcard?

I have, but that wasn't the question :-)

Something has to load the sound kernel modules at system start up - and I would like to find out what does this and at what stage of the system start up process this happens.

cannot answer all your question but found that sometime around 5.3 -> 5.4 that the order of sound modules loading changed. I found that one needed to edit modprobe.conf and add index=0 or index=1 as needed to get the modules loading correctly and thus allowing related software to find them in the correct place. HTH

James Pearson _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos

On Mon, 7 Feb 2011, James Pearson wrote:

To: CentOS mailing list centos@centos.org From: James Pearson james-p@moving-picture.com Subject: Re: [CentOS] How and when are the sound modules loaded at system boot time on CentOS 5?

m.roth@5-cent.us wrote:

...

James Pearson wrote:

...

I've been trying to work out how the various sound modules get loaded at boot time on CentOS 5 - but I can't find anything obvious under /etc/rc.d/

CentOS 4 did this in /etc/rc.d/rc.sysinit - but there is nothing equivalent in CentOS 5

Does anyone know how these modules get loaded?

Have you tried system-config-soundcard?

I have, but that wasn't the question :-)

Something has to load the sound kernel modules at system start up - and I would like to find out what does this and at what stage of the system start up process this happens.

Hi James.

Doesn't the kernel probe the machine's hardware at boot up time, and if it finds your soundcard, load the appropriate driver for it?

If the hardware is not detected by the kernel, then you probably would have to manually load the respective hardware driver with modprobe.

[root@karsites ~]# modprobe -l *cmi* /lib/modules/2.6.18-194.32.1.el5/kernel/sound/pci/snd-cmipci.ko

Kind Regards,

Keith Roberts

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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?

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

lemme see if i can finds ya a book to read

Why not explain exactly your problem? Theres a reason you need to know and y?

John

On Mon, 2011-02-07 at 20:37 +0000, James Pearson wrote:

JohnS wrote:

...

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.

snd-hda-intel get blacklisted somehow. or it is not listed in the modprobe conf to load. An idea just thinking yo could remove the kernel reinstall it with only the cards you want enabled. You could look into the initrd for startup modules also with cpio. Back it up first though.

Also you should make sure the it has the right PCI Identfier for the *.ko . If My other questions are, is your init subsystem in working order; like it should work and look for extra modules to load in sysconfig? All fails create an insmod *.ko script for startup.

John

On Mon, 7 Feb 2011, James Pearson wrote:

To: CentOS mailing list centos@centos.org From: James Pearson james-p@moving-picture.com Subject: Re: [CentOS] How and when are the sound modules loaded at system boot time on CentOS 5?

Keith Roberts wrote:

...

Doesn't the kernel probe the machine's hardware at boot up time, and if it finds your soundcard, load the appropriate driver for it?

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?

Hi James. Good question. I can't say for sure, but I guess it's some sort of h/w detection code in the kernel. This may be of some help:

http://www.ibm.com/developerworks/library/l-linuxboot/index.html

Kind Regards,

Keith Roberts

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