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From: Harald Dunkel <harald.dunkel@t-online.de>
To: Tejun Heo <htejun@gmail.com>
Cc: Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.19.1, sata_sil: sata dvd writer doesn't work
Date: Wed, 17 Jan 2007 22:46:28 +0100	[thread overview]
Message-ID: <45AE9934.6040009@t-online.de> (raw)
In-Reply-To: <45AE30A8.70802@gmail.com>

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Hi Tejun,

Tejun Heo wrote:
> 
> Okay, I just tested a number of dvds on x86-64 and x86.  The error
> pattern is really interesting.  It doesn't matter whether you're on
> x86-64 or x86, 2.6.18 or 2.6.20-rc5.  The problem occurs when a dvd
> which doesn't match dvd's region mask is played.
> 
> MMC command 0xa4 (READ KEY) is the one which always fails.  After the
> failure, the odd goes into strange state and usually won't respond to
> commands.  Interestingly, if you pull the power plug or reset the
> machine while the READ KEY command is in progress and then reconnect it,
> you can play the DVD after that.  I've checked this multiple times and
> no, dvdcss key caching isn't the cause, crossed checked it multiple times.
> 
> Once you played a dvd this way, the drive seems to remember the dvd and
> successfully plays it afterwards.  I've checked this multiple times
> using completely separate OS installation (one x86, the other x86-64).
> 

How comes that there is no such problem if I connect the drive
via an USB SATA adapter?

> This almost looks like new defense method against CSS-workaround.  Can't
> understand why the drive remembers successfully played dvds tho.
> 

I would have the option to return it (playing no DVDs is surely
a defect), but this would be a shame. It was lightning fast on writing,
a little bit noisy, though, but I was really glad to get rid of that
clumsy parallel cable.

Do you think it would be reasonable to send a bug report to Samsung,
and see what they say? I would need some documentation about these
MMC commands, though. Is this part of some "Red Book" standard, or
so?


Regards

Harri



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  reply	other threads:[~2007-01-17 21:46 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-12-16 15:56 Harald Dunkel
2006-12-19 14:34 ` Tejun Heo
2006-12-19 18:42   ` Harald Dunkel
2006-12-19 23:59     ` Tejun Heo
2006-12-21 19:52       ` Harald Dunkel
2006-12-27  5:03         ` Tejun Heo
2006-12-28  4:23           ` Tejun Heo
2006-12-28 19:46             ` Harald Dunkel
2007-01-02 11:55               ` Tejun Heo
2007-01-02 19:20                 ` Harald Dunkel
2007-01-08 19:08                 ` Harald Dunkel
2007-01-17 14:20                   ` Tejun Heo
2007-01-17 21:46                     ` Harald Dunkel [this message]
2007-01-18  1:22                       ` Tejun Heo
2006-12-26 11:27 ` Harald Dunkel

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