> [ 432.935107] ieee1394: sbp2: scsi_add_device failed (-19)

This _may_ indeed be the bug which I referred to in my previous comment.
Ubuntu's 2.6.15-20 has a regression of upstream 2.6.16, which is partly
my fault. Ubuntu Edgy has the regression fixed. See bug #36619.

> [ 432.937341] scsi1 : SCSI emulation for IEEE-1394 SBP-2 Devices
> [ 454.750819] ieee1394: sbp2: Error logging into SBP-2 device - login 
> timed-out

This additional login attempt right after the first one failed is something 
which I see with my PL-3507 based DVD-RW too --- but only on a TI based 1394b 
host adapter, not on a VIA based 1394a host adapter. I haven't investigated if 
there is a possible workaround, but it was reported that a firmware update 
helps:
http://thread.gmane.org/gmane.linux.kernel.firewire.user/1903/focus=1931

Firmware for _some_ PL-3507 revisions are available at
http://www.prolific.com.tw/eng/downloads.asp?ID=44
You need a Windows PC with USB to upload the firmware to the enclosure's 
bridge. Unless it is something else than PL-3507.

-- 
External Firewire DVD-RW not working.
https://launchpad.net/bugs/39257

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