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Old 15th December 2007, 04:34 AM
ConfusedNewb Offline
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Join Date: Nov 2007
Location: The Internet
Age: 27
Posts: 19
M-Audio MobilePre USB Audio Box Stopped Working Since Being Reconnected

I have an M-Audio MobilePre USB audio box that has recently ceased to work. It was working since the installation of Fedora 7 (when the audio box was plugged in). I recently removed it from the USB port to plug in an external drive. When I plugged the audio box back into the SAME port, it won't come up as an option as an audio device. I have been around google and some sites but everything I find on it, when I do find something, is unresolved. I have noticed it seems to be common that unplugging the box results in it no working when plugged back in. It is located at /proc/bus/usb/001/007. The manufacturer does not offer linux drivers and I can't find any anywhere else. After fixing lsusb (it would say unknown command), it gave me this output for the device:
Device: ID 0763:2804 Midiman
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 254 Application Specific Interface
bDeviceSubClass 1 Device Firmware Update
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0763 Midiman
idProduct 0x2804
bcdDevice 1.00
iManufacturer 1 Unknown
iProduct 2 Unknown
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x40
Self Powered
MaxPower 400mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 254 Application Specific Interface
bInterfaceSubClass 1 Device Firmware Update
bInterfaceProtocol 0
iInterface 3 RAM
I would think the "unknown" manufacturer and product are M-Audio and MobilePre, respectively. Someone please help me with this. I have been without music for quite a while now, which is a fact that is getting annoying when trying to fix other problems. If anyone needs any more info, just ask. I would really like to get this fixed without having to reinstall the OS. Thanks in advance for any help. I would REALLY appreciate it.
checking whether build environment is sane... yes
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Old 15th December 2007, 09:14 AM
ConfusedNewb Offline
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Join Date: Nov 2007
Location: The Internet
Age: 27
Posts: 19
Update: While searching around, I came across the command
strace -eopen alsamixer
I had recently installed an alsa mixer package with yum so I tried the command. It gave me this output:
open("/etc/ld.so.cache", O_RDONLY)      = 3
open("/lib/libncurses.so.5", O_RDONLY)  = 3
open("/lib/libasound.so.2", O_RDONLY)   = 3
open("/lib/libm.so.6", O_RDONLY)        = 3
open("/lib/libdl.so.2", O_RDONLY)       = 3
open("/lib/libpthread.so.0", O_RDONLY)  = 3
open("/lib/libc.so.6", O_RDONLY)        = 3
open("/lib/libtinfo.so.5", O_RDONLY)    = 3
open("/etc/alsa/alsa.conf", O_RDONLY)   = 3
open("/etc/asound.conf", O_RDONLY)      = 3
open("/dev/snd/controlC0", O_RDONLY)    = -1 ENOENT (No such file or directory)
open("/dev/aloadC0", O_RDONLY)          = -1 ENOENT (No such file or directory)

alsamixer: function snd_ctl_open failed for default: No such device
If anyone has any pointers or anything helpful, PLEASE post it. This silence is killing me. I keep seeing stuff about a file asound_card.conf but I don't have this file in my etc folder. Could this have something to do with it?

EDIT- I would appreciate even just a command to mount /proc/bus/usb/*port*/*device* as an audio device. Even if I would have to do it every reboot, I just want audio now to listen to while trying to fix my tons of other stuff.
checking whether build environment is sane... yes

Last edited by ConfusedNewb; 15th December 2007 at 09:17 AM.
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Old 16th December 2007, 05:26 AM
ConfusedNewb Offline
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Join Date: Nov 2007
Location: The Internet
Age: 27
Posts: 19
I had another idea. The initial installation of Fedora 7 (my current OS) detected and installed the audio box. Is there some way I can run the script that did that without reinstalling the whole OS?
checking whether build environment is sane... yes
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audio, box, maudio, mobilepre, reconnected, stopped, usb, working

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