Trying to disable a Udev rule. Deleting it is not working.

Question

I am trying to configure my sound. I have a usb sound card I want it to be default.
I followed the procedure as described here .
So, my default soundcard was my usb soundcard!
But, did this,
Hot-plugging a USB sound card
The following udev rule can be used to automatically make a USB sound card the primary output device when the card is plugged in. To do so, create the following file with the specified contents and.
/etc/udev/rules.d/00-local.rules
KERNEL=="pcmC[D0-9cp]*", ACTION=="add", PROGRAM="/usr/bin/sh -c 'K=%k; K=$${K#pcmC}; K=$${K%%D*}; echo defaults.ctl.card $$K > /etc/asound.conf; echo defaults.pcm.card $$K >>/etc/asound.conf'"
KERNEL=="pcmC[D0-9cp]*", ACTION=="remove", PROGRAM="/usr/bin/sh -c 'echo defaults.ctl.card 0 > /etc/asound.conf; echo defaults.pcm.card 0 >>/etc/asound.conf'"
For information regarding loading udev rules see the following: Udev#Loading_new_rules
But it was a mistake.. So, I wanted to correct this. I deleted this file.
rm -rf /etc/udev/rules.d/00-local.rules
after that, as mentioned here
udevadm control --reload
udevadm trigger
After reboot, I was having again the file
/etc/asound.conf
which is created after the rule is triggered.
So, what can i Do ?

Answer 1

MoonSwan wrote:
I may be mis-understanding your problem, zabrielza, so please correct me if I am off base here.
You have 2 soundcards, yes?  One is a HDA Intel on-board and the other is your USB card.  You want the USB card to be the default all the time, correct?  If that is true then I suggest using this little part of the Alsa Wiki article to set your default card: https://wiki.archlinux.org/index.php/Ad … sound_card  I have used that part of the wiki successfully to set my default card, as I also have two sound cards, and I've had few issues since then. 
As I said when I began this post, I may be wrong here so please say so if I am.  You might also want to start over and re-state exactly what your goal is because I see some posters are confused about what it is you're trying to accomplish.
Yes you are right. You described my situation perfectly.  Firstly I started this topic to learn/know How should i disable correctly udev rules. It turns out that my udev rule is disabled. I have this file
/etc/modprobe.d/alsa-base.conf
configured correctly. Before I create the rule I had sound correctly but I never followed this.
Select the default PCM via environment variable
In your configuration file, preferably global, add:
pcm.!default {
    type plug
    slave.pcm {
        @func getenv
        vars [ ALSAPCM ]
        default "hw:Audigy2"
You need to replace the default line with the name of your card (in the example is Audigy2). You can get the names with aplay -l or you can also use PCMs like surround51. But if you need to use the microphone it is a good idea to select full-duplex PCM as default.
Now you can start programs selecting the sound card just changing the environment variable ALSAPCM. It works fine for all program that do not allow to select the card, for the others ensure you keep the default card. For example, assuming you wrote a downmix PCM called mix51to20 you can use it with mplayer using the commandline ALSAPCM=mix51to20 mplayer example_6_channel.wav
Instead of using new variables, you could set one of those mentioned in default global configuration.
/usr/share/alsa/alsa.conf
Variable name # Definition
ALSA_CARD # pcm.default pcm.hw pcm.plughw ctl.sysdefault ctl.hw rawmidi.default rawmidi.hw hwdep.hw
ALSA_CTL_CARD # ctl.sysdefault ctl.hw
ALSA_HWDEP_CARD # hwdep.default hwdep.hw
ALSA_HWDEP_DEVICE # hwdep.default hwdep.hw
ALSA_PCM_CARD # pcm.default pcm.hw pcm.plughw
ALSA_PCM_DEVICE # pcm.hw pcm.plughw
ALSA_RAWMIDI_CARD # rawmidi.default rawmidi.hw
ALSA_RAWMIDI_DEVICE # rawmidi.default rawmidi.hw
Note: Pay attention to default addressing type.
So, Should I try it now? Do I have to reset alsa-installation first ( I do not know how to do this ) or not?