Hello,

I would like to find out if this is an USB-Problem in the kernel or if this is a 
problem with the ALSA snd-usb-audio driver.
So I recompiled the kernel without the snd-usb-audio module. When plugging the device 
into an usb port an unplugging it again I can still use my keyboard. Here's what dmesg 
says:

ehci_hcd 0000:00:1d.7: GetStatus port 1 status 001803 POWER sig=j  CSC CONNECT
hub 4-0:1.0: port 1, status 0501, change 0001, 480 Mb/s
hub 4-0:1.0: debounce: port 1: delay 100ms stable 4 status 0x501
hub 4-0:1.0: port 1 not reset yet, waiting 50ms
ehci_hcd 0000:00:1d.7: port 1 full speed --> companion
ehci_hcd 0000:00:1d.7: GetStatus port 1 status 003801 POWER OWNER sig=j  
CONNECTehci_hcd 0000:00:1d.7: GetStatus port 2 status 003002 POWER OWNER sig=se0  CSC
hub 4-0:1.0: port 2, status 0000, change 0001, 12 Mb/s
ehci_hcd 0000:00:1d.7: GetStatus port 5 status 003002 POWER OWNER sig=se0  CSC
hub 4-0:1.0: port 5, status 0000, change 0001, 12 Mb/s
uhci_hcd 0000:00:1d.0: port 1 portsc 0093
hub 1-0:1.0: port 1, status 0101, change 0001, 12 Mb/s
hub 1-0:1.0: debounce: port 1: delay 100ms stable 4 status 0x101
usb 1-1: new full speed USB device using address 4
usb 1-1: skipped 25 descriptors after interface
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface
usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: new device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-1: default language 0x0409
usb 1-1: Product: SB Audigy 2 NX
usb 1-1: Manufacturer: Creative Technology Ltd
usb 1-1: hotplug
usb 1-1: adding 1-1:1.0 (config #1, interface 0)
usb 1-1:1.0: hotplug
usb 1-1: adding 1-1:1.1 (config #1, interface 1)
usb 1-1:1.1: hotplug
usb 1-1: adding 1-1:1.2 (config #1, interface 2)
usb 1-1:1.2: hotplug
[EMAIL PROTECTED] sk $

After unplugging this is shown:

ehci_hcd 0000:00:1d.7: GetStatus port 1 status 001002 POWER sig=se0  CSC
hub 4-0:1.0: port 1, status 0100, change 0001, 12 Mb/s
ehci_hcd 0000:00:1d.7: GetStatus port 2 status 003002 POWER OWNER sig=se0  CSC
hub 4-0:1.0: port 2, status 0000, change 0001, 12 Mb/s
ehci_hcd 0000:00:1d.7: GetStatus port 5 status 003002 POWER OWNER sig=se0  CSC
hub 4-0:1.0: port 5, status 0000, change 0001, 12 Mb/s
uhci_hcd 0000:00:1d.0: port 1 portsc 0088
hub 1-0:1.0: port 1 enable change, status 00000100
[EMAIL PROTECTED] sk $

Is there anything wrong? What about this repeating 

usb 1-1: skipped 1 descriptor after endpoint
usb 1-1: skipped 2 descriptors after interface

messages?

Thanks

Sebastian
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