Asus dvd writer 1608P2S-D not detected

[The Dragon Master]

Hi, I have an Asus DRW 1608P2S-D connected via USB 2 which is not being detected.

dave@daves-desktop:~$ tail -n 20 /var/log/kern.log
Aug 4 16:20:30 daves-desktop kernel: [ 784.993752] usb 4-4: USB disconnect, address 65
Aug 4 16:20:30 daves-desktop kernel: [ 785.266334] usb 4-4: new high speed USB device using ehci_hcd and address 66
Aug 4 16:20:30 daves-desktop kernel: [ 785.505480] usb 4-4: configuration #1 chosen from 1 choice
Aug 4 16:20:30 daves-desktop kernel: [ 785.535441] scsi47 : SCSI emulation for USB Mass Storage devices
Aug 4 16:20:30 daves-desktop kernel: [ 785.542428] usb-storage: device found at 66
Aug 4 16:20:30 daves-desktop kernel: [ 785.542435] usb-storage: waiting for device to settle before scanning
Aug 4 16:20:31 daves-desktop kernel: [ 785.932462] usb 4-4: USB disconnect, address 66
Aug 4 16:20:31 daves-desktop kernel: [ 786.170074] usb 4-4: new high speed USB device using ehci_hcd and address 67
Aug 4 16:20:31 daves-desktop kernel: [ 786.409247] usb 4-4: configuration #1 chosen from 1 choice
Aug 4 16:20:31 daves-desktop kernel: [ 786.439195] scsi48 : SCSI emulation for USB Mass Storage devices
Aug 4 16:20:31 daves-desktop kernel: [ 786.446176] usb-storage: device found at 67
Aug 4 16:20:31 daves-desktop kernel: [ 786.446183] usb-storage: waiting for device to settle before scanning
Aug 4 16:20:32 daves-desktop kernel: [ 786.839081] usb 4-4: USB disconnect, address 67
Aug 4 16:20:32 daves-desktop kernel: [ 787.077826] usb 4-4: new high speed USB device using ehci_hcd and address 68
Aug 4 16:20:32 daves-desktop kernel: [ 787.321145] usb 4-4: configuration #1 chosen from 1 choice
Aug 4 16:20:32 daves-desktop kernel: [ 787.356941] scsi49 : SCSI emulation for USB Mass Storage devices
Aug 4 16:20:32 daves-desktop kernel: [ 787.369403] usb-storage: device found at 68
Aug 4 16:20:32 daves-desktop kernel: [ 787.369410] usb-storage: waiting for device to settle before scanning
Aug 4 16:20:33 daves-desktop kernel: [ 788.434409] usb 4-4: USB disconnect, address 68
Aug 4 16:20:34 daves-desktop kernel: [ 788.705388] usb 4-4: new high speed USB device using ehci_hcd and address 69

any ideas?

[The Dragon Master]

Here is the last part of the output from

$ dmesg
[ 784.575512] scsi46 : SCSI emulation for USB Mass Storage devices
[ 784.582690] usb-storage: device found at 65
[ 784.582697] usb-storage: waiting for device to settle before scanning
[ 784.993752] usb 4-4: USB disconnect, address 65
[ 785.266334] usb 4-4: new high speed USB device using ehci_hcd and address 66
[ 785.505480] usb 4-4: configuration #1 chosen from 1 choice
[ 785.535441] scsi47 : SCSI emulation for USB Mass Storage devices
[ 785.542428] usb-storage: device found at 66
[ 785.542435] usb-storage: waiting for device to settle before scanning
[ 785.932462] usb 4-4: USB disconnect, address 66
[ 786.170074] usb 4-4: new high speed USB device using ehci_hcd and address 67
[ 786.409247] usb 4-4: configuration #1 chosen from 1 choice
[ 786.439195] scsi48 : SCSI emulation for USB Mass Storage devices
[ 786.446176] usb-storage: device found at 67
[ 786.446183] usb-storage: waiting for device to settle before scanning
[ 786.839081] usb 4-4: USB disconnect, address 67
[ 787.077826] usb 4-4: new high speed USB device using ehci_hcd and address 68
[ 787.321145] usb 4-4: configuration #1 chosen from 1 choice
[ 787.356941] scsi49 : SCSI emulation for USB Mass Storage devices
[ 787.369403] usb-storage: device found at 68
[ 787.369410] usb-storage: waiting for device to settle before scanning
[ 788.434409] usb 4-4: USB disconnect, address 68
[ 788.705388] usb 4-4: new high speed USB device using ehci_hcd and address 69

[The Dragon Master]

the following one-liner has solved the problem, is anyone able to explain why?

sudo modprobe -r ehci-hcd

[The Dragon Master]

It seems I must run this line again each time I turn the computer on. Is there a hack to avoid doing this manually every time I turn the computer on?

Thanks
TDM