Re: No supported write modes with LG GSA-H62N SATA DVD+RW

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

me:
> > Else we could repeat the old experiment which i made
> >       with a user on the debburn-devel list.
> >       It resulted in this error
> >          5 1A 00 PARAMETER LIST LENGTH ERROR
> >       when any mode page was sent.
Joe MacDonald:
> That was the list of steps you sent yesterday? 

I learned from your remote experiment with the
empty tray on Linux that the drive gives no hint
of an unusual length of mode page 05h.

> > > Date: Mon, 10 Sep 2007 13:12:24 -0400

This here inquired the mode page 05h from the drive:

Executing 'mode sense g1' command on Bus 0 Target 0, Lun 0 timeout 40s
CDB:  5A 00 05 00 00 00 00 00 3C 00
cmd finished after 0.001s timeout 40s
Mode Sense Data 00 3A 41 00 00 00 00 00 05 32 61 04 08 10 00 00 00 00 00
00 00 00 00 96 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00


I also believe to see the failed attempts to
set that mode page for testing the available
write modes.
Search for: "CDB:  55 10 00 00 00 00 00 00 3C"

Executing 'mode select g1' command on Bus 0 Target 0, Lun 0 timeout 40s
CDB:  55 10 00 00 00 00 00 00 3C 00
cdrecord: Input/output error. mode select g1: scsi sendcmd: no error
CDB:  55 10 00 00 00 00 00 00 3C 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 05 00 00 00 00 0A 55 00 00 0C 1A 00 00 00
Sense Key: 0x5 Illegal Request, Segment 0
Sense Code: 0x1A Qual 0x00 (parameter list length error) Fru 0x0
Sense flags: Blk 0 (not valid)
resid: 60
cmd finished after 0.003s timeout 40s

We don't see the mode page itself, but the Parameter
List Length 3Ch in byte 7+8 of the CDB would match a
page length of 32h which is typical for mode page 05h
and also is the replied length above.


We see several of these calls. All fail with
Sense Key: 0x5 Illegal Request, Segment 0
Sense Code: 0x1A Qual 0x00 (parameter list length error) Fru 0x0

The same was experienced by cdrskin a few months ago.
So i would say the symptoms are stable and reproducible
on several individual systems.

So the bug is ripe to be shown to the kernel people.


> Ubuntu ships wodim and most of my testing has been post-wodim-removal.

I am quite sure that you will see the same failing
commands in a trace of wodim. My first encounter with
the problem was on debburn-devel list about wodim.
Option -V should work with wodim too.

I am looking forward in great hope to your further
activities in this case.


Have a nice day :)

Thomas