linux-kernel - Re: macbook pro dvd playback after suspend Buffer I/O error

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Message-ID: <4850C1AC.4090809@gmail.com>
Date:	Thu, 12 Jun 2008 15:26:52 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Justin Mattock <justinmattock@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: macbook pro dvd playback after suspend Buffer I/O error

Justin Mattock wrote:
> O.K. applied the patch and did what you have described,(except for
> sysctl -w / ended up inserting dev.scsi.logging_level=1 in
> /etc/sysctl.conf)
> This is what dd reported:(same as before)
> dd: reading `/dev/sr0':Input/output error
> 41+1 records in
> 41+1 records out
> 43122688 bytes (43 MB) copied, 41.0967 seconds, 1.0 MB/s
> 
> Attached is dmesg of using dd on the first suspend, and playing a dvd
> on the second.

Ah.. okay.  The drive was becoming ready and the read commands were
retried too fast.  The drive I tested on was fast enough to deliver the
data but yours wasn't.  Hmmm.... This is difficult.  This also poses
problems to live cd distros, I think.  We probably need to make sr wait
for device readiness.  Maybe it's best to put TUR waiting in read error
handling.  I'll think about it.

Thanks.

-- 
tejun
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