[alsa-devel] [PATCH] add Steinberg UR44 USB Audio Interface support to quirks-table

[Takashi Iwai]

At Mon, 2 Feb 2015 22:56:31 -0800,
Cyrus Harmon wrote:
> 
> 
> Dear Takashi,
> 
> Sorry for the delay in getting back to this. Your instructions seem 
> close, but I've run into the following issues:
> 
> 1. the module is installed in  /lib/modules/`uname -r`/extra instead of 
> kernel/sound/usb
> 
> 2. I can get around that with:
> 
> sudo insmod /lib/modules/`uname -r`/extra/snd-usbmidi-lib.ko
> sudo insmod /lib/modules/`uname -r`/extra/snd-usb-audio.ko
> 
> but there's probably a better way.

modprobe will load from extra directory before others automatically.

> 3. I can't do the same tricks with snd-pcm as I get the following error:
> 
> sly at madbox:/lib/modules/3.19.0-rc7-local$ sudo modprobe -r snd-pcm
> modprobe: FATAL: Module snd_pcm is in use.
> 
> Is there a way to disable snd_pcm and reload the module?

Unload the module referring to snd-pcm, in your case, snd-usb-audio at
first.


Takashi


> Barring that, I 
> at least want to be able to install the new snd_pcm and reboot, without 
> having to rebuild the whole kernel, so solving problem 1 would 
> presumably help for that.
> 
> Thanks for your help!
> 
> Cyrus
> 
> On 11/06/2014 08:49 AM, Takashi Iwai wrote:
> > At Thu, 06 Nov 2014 08:05:43 -0800 Cyrus Harmon wrote:
> >> On a somewhat related note, is there a way to apply changes to things 
> >> in, say, sound/usb and compile/install those changes without a few 
> >> kernel rebuild/install? Or, even better, without a reboot? Would 
> >> certainly shorting the debug cycle time for me. In this case I'm 
> >> interested in finding out what quirk->type is when it gets to 
> >> snd_usb_create_quirk as it looks like the function in the quirk_funcs 
> >> table that gets called here produces the first suspect error. Adding 
> >> a dev_info, followed by a kernel rebuild, reinstall, reboot (and the 
> >> fact that my broken nvidia drivers require reinstalling the video 
> >> driver every time I install a new kernel) makes for a tedious process!
> > It's a standard procedure, something like... % mkdir /somewhere % cd 
> > /somewhere % cp -a /there/linux/sound . % patch -p1 < your-usb.patch % 
> > make -C /lib/modules/`uname -r`/build M=$PWD/sound/usb % su # make -C 
> > /lib/modules/`uname -r`/build M=$PWD/sound/usb modules_install # 
> > modprobe -r snd-usb-audio # modprobe snd-usb-audio Takashi
>