I'd like to get the snd-virmidi driver working on my setup, but even
after reading the documentation included with the kernel for Alsa and
the Alsa wiki, I'm a bit murky on all the stuff that's in modprobe's
configuration for getting everything loaded at bootup. Currently, I
have an Intel sound chipset on my motherboard that I'm using index=0 to
ensure will be my primary sound device, followed by my RME Multiface
with index=1. I also have an Edirol UM-3EX USB 3-port Midi interface
that's being forced to be last with index=-2, since it's not really even
a sound device and I want it to be last (though how "-2" is achieving
this is one of the things I'm murky about, and hesitant to screw with).
This yields the following presently positive result in
/proc/asound/cards:
village:~# cat /proc/asound/cards
0 [SB ]: HDA-Intel - HDA ATI SB
HDA ATI SB at 0xfb9f8000 irq 16
1 [DSP ]: H-DSP - Hammerfall DSP
RME Hammerfall DSP + Multiface at 0xfbbf0000, irq 19
2 [UM3EX ]: USB-Audio - UM-3EX
EDIROL UM-3EX at usb-0000:00:12.1-2.1, full speed
If I enable the snd-virmidi driver, I'd like it to be even lower in
priority than the Edirol UM-3EX Midi, and be last. Probably that means
the Edirol now becomes index=2, but does snd-virmidi become index=-2?
The kernel documentation says negative card indexes are "a bitmask of
permissable indexes"...from what? An 8-bit number? How does that work
exactly? I do understand what a bitmask is...but what is this doing
really? With my current configuration, I'm getting what I want, but I'm
unsettled that I don't know how it's being achieved. Just for
amusement/advice, I've included my /etc/modprobe.d/alsa.conf below.
Feel free to point out anything that looks foolish, because it's largely
been adapted from what the modprobe package came with by default:
-------------------------------------------------------------------------
# Alsa kernel modules' configuration file.
# ALSA portion
alias char-major-116 snd
# OSS/Free portion
alias char-major-14 soundcore
##
## IMPORTANT:
## You need to customise this section for your specific sound card(s)
## and then run `update-modules' command.
## Read alsa-driver's INSTALL file in /usr/share/doc for more info.
##
## ALSA portion
alias snd-card-1 snd-hdsp
alias snd-card-0 snd-hda-intel
options snd-hda-intel index=0
options snd-hdsp index=1
options snd-usb-audio index=-2
## OSS/Free portion
alias sound-slot-0 snd-card-0
alias sound-slot-1 snd-card-1
##
# OSS/Free portion - card #1
alias sound-service-0-0 snd-mixer-oss
alias sound-service-0-1 snd-seq-oss
alias sound-service-0-3 snd-pcm-oss
alias sound-service-0-8 snd-seq-oss
alias sound-service-0-12 snd-pcm-oss
# OSS/Free portion - card #2
alias sound-service-1-0 snd-mixer-oss
alias sound-service-1-3 snd-pcm-oss
alias sound-service-1-12 snd-pcm-oss
alias /dev/mixer snd-mixer-oss
alias /dev/dsp snd-pcm-oss
alias /dev/midi snd-seq-oss
# Set this to the correct number of cards.
options snd cards_limit=4
# options snd slots=snd-hda-intel,snd-hdsp,snd-usb-audio
--
+ Brent A. Busby + "We've all heard that a million monkeys
+ Sr. UNIX Systems Admin + banging on a million typewriters will
+ University of Chicago + eventually reproduce the entire works of
+ James Franck Institute + Shakespeare. Now, thanks to the Internet,
+ Materials Research Ctr + we know this is not true." -Robert Wilensky
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