[PlanetCCRMA] Re: DVD playback not fluent

[Alex Timmer]

hi John,

is your /dev/dvd a real device or just a symbolic link? if the latter
is the case, did you try hdparm as root on the 'real' dvdrom device?
in my case /dev/dvd is a symlink to /dev/hdc and i have to use hdparm
on /dev/hdc to get any effect. 

does your drive support dma? if you do 'hdparm /pathto/drivename' you
get a listing of capabilities of the drive.

hope this helps, ALEX



 --- John Wheeler <jdw27_42@hotmail.com> wrote: > >Subject: Re:
[PlanetCCRMA] DVD playback not fluent
> >From: Mike Artis <mike@techead.com>
> >To: Alex Timmer <mijn_troep@yahoo.com>
> >Cc: planetccrma@ccrma.Stanford.EDU
> >Organization:
> >Date: 09 Apr 2003 16:44:24 -0400
> >
> >It may also not be video drivers causing the problem.  Have you
> checked
> >to see whether DMA is enabled on the DVD drive?
> >
> >Try hdparm -d /dev/dvd to see if it's enabled.  If not, it will
> really
> >help latency if you enable it by issuing this command: hdparm -d 1
> >/dev/dvd.
> >
> >Read the hdparm man page for more options you can add to set ide
> disk
> >parameters.
> 
> When I tried "/sbin/hdparm -d 1 /dev/dvd" as a normal user,
> obviously I got 
> the message:
> 
> /dev/dvd:
> setting using_dma to 1 (on)
> HDIO_SET_DMA failed: Permission denied
> using_dma    =  0 (off)
> 
> However, when I tried it as root, I got:
> 
> /dev/dvd:
> setting using_dma to 1 (on)
> HDIO_SET_DMA failed: Operation not permitted
> using_dma    =  0 (off)
> 
> Since the message isn't the same as for a normal user, I assume
> it's a 
> different problem.  Is this a hardware problem?  Is there an easy
> fix?
> 
> My DVD playback is reasonably smooth, just with momentary glitches,
> so if 
> there's a possibilty of breaking anything, I'll just live with it. 
> It's 
> just obnoxious that DVD playback is smoother under Windows 98.  (Of
> course, 
> in exchange occasionally the DVD player hangs Windows hard enough
> to require 
> a hard reset.)
> 
> ++JohnWheeler
> 
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