Re: How to change DVD-ROM speed?

From: Jeffrey W. Baker (
Date: Wed Jun 27 2001 - 12:59:23 EST

On Wed, 27 Jun 2001, Jens Axboe wrote:

> 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 :-)

I will be happy to :) Should I hang conditional code off the existing
ioctl (CDROM_SELECT_SPEED, ide_cdrom_select_speed) or use a new one?


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This archive was generated by hypermail 2b29 : Sat Jun 30 2001 - 21:00:17 EST