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Old 11-19-2006, 04:41 AM   #1
sonium
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Registered: Nov 2006
Posts: 1

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"M-Audio Mobile Pre Usb" Soundcard stopped working


Distribution: Ubuntu Edgy Eft
Vendor: M-Audio (aka midiman)
Device: Mobile Pre USB
Class: External Soundcard

Hi, after a fresh installed the external usb-soundcard worked fine. But after I brought my PC to another places I reconnected the device to another port. From this time I didn't work anymore. For dapper there exists a programm that modifies the udev rule set an fixed this issue, but for edgy it doesn't work. Maybe the udev system is to different from debian.

So here is some information from lsusb:

Code:
Bus 003 Device 007: 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
      (Missing must-be-set bit!)
      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
Device Status:     0x0000
  (Bus Powered)

The output on /var/log/messages on disconnect and reconnect is this:
Code:
Nov 19 11:36:00 raumstation kernel: [17344922.940000] usb 3-2: USB disconnect, address 7
Nov 19 11:36:07 raumstation kernel: [17344930.560000] usb 3-2: new full speed USB device using uhci_hcd and address 8
Nov 19 11:36:08 raumstation kernel: [17344930.720000] usb 3-2: configuration #1 chosen from 1 choice

The device should also be class compatible (accourding the the vendor). Is there maybe a way to force linux to treat this a sound device?
 
Old 12-21-2006, 11:58 PM   #2
shockdiode
LQ Newbie
 
Registered: Dec 2006
Posts: 1

Rep: Reputation: 0
I had an issue with this after upgrading to edgy as well. Syslog reports:

Dec 21 21:47:02 ryan-laptop kernel: [17185631.860000] usb 1-2: USB disconnect, address 38
Dec 21 21:47:04 ryan-laptop kernel: [17185633.864000] usb 1-2: new full speed USB device using uhci_hcd and address 39
Dec 21 21:47:04 ryan-laptop kernel: [17185634.024000] usb 1-2: configuration #1 chosen from 1 choice
Dec 21 21:47:04 ryan-laptop madfuload: cannot open /proc/bus/usb/001/(device #): No such file or directory

I assume you have madfuload installed if it was working initially. I found that manually running madfuload will properly upload the firmware in spite of the error recieved:

sudo madfuload -f /usr/local/share/usb/maudio/ma004103.bin -n -3 -D /proc/bus/usb/001/042(the device# will be different here)
cannot reset device: (19) No such device

I also found that issuing: sudo /etc/init.d/udev restart after plugging in the device seems to make it work.

I don't have a more elegant solution at the moment but just started playing with it. I hope this is of some use.
 
  


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