From: "Justin Mattock" <justinmattock@gmail.com>
To: "Tvrtko A. Ursulin" <tvrtko@ursulin.net>
Cc: "Alan Cox" <alan@lxorguk.ukuu.org.uk>,
linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org
Subject: Re: 2.6.26 DVD playing regression with libata
Date: Tue, 29 Jul 2008 23:59:34 -0700 [thread overview]
Message-ID: <dd18b0c30807292359s4b41c3b1m82ddf7707f41e402@mail.gmail.com> (raw)
In-Reply-To: <200807300757.29520.tvrtko@ursulin.net>
On Tue, Jul 29, 2008 at 11:57 PM, Tvrtko A. Ursulin <tvrtko@ursulin.net> wrote:
> On Wednesday 30 July 2008 00:20:11 Alan Cox wrote:
>> > Jul 29 21:10:03 media kernel: [353032.319013] sr 2:0:0:0: [sr0] unaligned
>> > transfer Jul 29 21:10:03 media kernel: [353032.319013] sr 2:0:0:0: [sr0]
>> > unaligned transfer
>>
>> This is coming from the scsi/block layer and definitely isn't good.
>> Doesn't directly look like a libata bug but seems to be higher up the
>> stack. What software is triggering this ?
>
> I tried to reproduce it now but could not.
>
> After a fresh boot into 2.6.26, I first tried mounting the DVD which was fine. Then I ran lsdvd which also worked and finally mplayer without any problems. In
> contrast to that yesterday I ran my playdvd.pl (http://www.ursulin.net/2008/06/effectively-using-mplayer-within-mythtv/) script from within MythTV and it
> exited immediately. It looked like either it triggered that failure without any delay or subsystem was already in that failure mode by simple DVD insertion.
> When ran directly lsdvd would exit being unable to open /dev/dvd (/dev/scdo). Unfortunately I didn't debug it further at the time.
>
> The only difference is that yesterday box had an uptime of couple of days while this morning it was completely fresh. Unless mounting the disc before
> everything else somehow stabilised something. Hm let me do another reboot... no, still can't reproduce it.
>
> One interesting thing, sometimes it detects drive capabilities like this:
> [ 3.498951] sr0: scsi3-mmc drive: 62x/62x writer dvd-ram cd/rw xa/form2 cdda tray
>
> And sometimes like this:
> [ 3.514104] sr0: scsi3-mmc drive: 48x/48x writer dvd-ram cd/rw xa/form2 cdda tray
>
> Later I think is correct according to drive datasheet.
>
> I will keep 2.6.26 running and see if the problem comes back in following days.
>
> Tvrtko
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>
I usually see these errors with mplayer i.g. insert a dvd
then press play instead of waiting for the dvd to settle down.
--
Justin P. Mattock
next prev parent reply other threads:[~2008-07-30 6:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-29 22:23 Tvrtko A. Ursulin
2008-07-29 23:20 ` Alan Cox
2008-07-30 6:57 ` Tvrtko A. Ursulin
2008-07-30 6:59 ` Justin Mattock [this message]
2008-07-30 7:08 ` Tvrtko A. Ursulin
2008-07-30 7:17 ` Justin Mattock
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