From: Jens Axboe <axboe@suse.de>
To: "Jeffrey W. Baker" <jwbaker@acm.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: How to change DVD-ROM speed?
Date: Wed, 27 Jun 2001 19:41:27 +0200 [thread overview]
Message-ID: <20010627194127.H17905@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.33.0106271018000.32012-100000@heat.gghcwest.com>
In-Reply-To: <Pine.LNX.4.33.0106271018000.32012-100000@heat.gghcwest.com>
On Wed, Jun 27 2001, Jeffrey W. Baker wrote:
> I am trying to change the spin rate of my IDE DVD-ROM drive. My system is
> an Apple PowerBook G4, and I am using kernel 2.4. I want the drive to
> spin at 1X when I watch movies. Currently, it spins at its highest speed,
> which is very loud and a large power load.
>
> /proc/sys/dev/cdrom/info indicates that the speed of the drive can be
> changed. I use hdparm -E 1 /dev/dvd to attempt to set the speed, and it
> reports success. However, the drive continues to spin at its highest
> speed.
Linux still uses the old-style SET_SPEED command, which is probably not
supported correctly by your newer drive. Just checking, I see latest Mt
Fuji only lists it for CD-RW. For DVD, we're supposed to do
SET_STREAMING to specify such requirements.
Feel free to implement it :-)
--
Jens Axboe
next prev parent reply other threads:[~2001-06-27 17:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-06-27 17:22 How to change DVD-ROM speed? Jeffrey W. Baker
2001-06-27 17:41 ` Jens Axboe [this message]
2001-06-27 17:59 ` Jeffrey W. Baker
2001-06-27 18:05 ` Jens Axboe
2001-06-28 6:42 ` Jeffrey W. Baker
-- strict thread matches above, loose matches on Subject: below --
2001-06-27 19:38 Jesse Pollard
2001-06-27 19:48 ` Jeffrey W. Baker
2001-06-27 20:09 ` Jens Axboe
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