[Pkg-libburnia-devel] Bug#789260: libburn4: Incompatibility with Plextor PX-608CU burner

Thomas Schmitt scdbackup at gmx.net
Mon Jun 22 18:34:17 UTC 2015


> I have found some interesting discussion about UAS bugs in kernel 3.16:
> https://lists.debian.org/debian-kernel/2014/07/msg00318.html

UAS ... google ... wikipedia ...
Well, it would be the natural way to perform SG_IO with a USB
device. Burn programs issue SCSI commands and UAS is designed
for transporting them. Wikipedia has:
"Version 3.18-rc4 of the Linux kernel disables buggy UAS
 implementation in xHCI host controllers Etron EJ168,
 ASMedia ASM1042,[19] and VIA VL80x.[20]"

But i understand that UAS is quite a new protocol.
Is your drive's USB controller young enough ? (Actually
i assume the drive is SATA or IDE and the box has a
USB-SATA or USB-IDE bridge bridge.)

> An here comes the output from my kern.log:
> Jun 22 15:12:02 D-NESTERKIN kernel: [    1.508233] usb 3-2: Product: PLEXTOR
> USB Storage Adapter

They really give few clue about age and version of the
drive-side USB controller.
I googled for "PLEXTOR USB Storage Adapter" "UAS" and found
nearly nothing. Descriptions of UAS refer to hard disks and
SSDs, rather than optical drives. But - as stated - i expect
it to depend on the USB-SATA or USB-IDE controller of the
drive box.

In any case, recent changes in USB are obvious suspects.
Now i'm curious whether the working and non-working Linuxes
show a pattern with kernel revisions.

Have a nice day :)


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