Re: [xine-user] Choppy audio/video when playing DVDs

[Florin A. <fl...@an...>]

Edit /etc/modules.conf and add this line to it:

options ide-cd dma=1

Then reboot.

Now try hdparm again, as root.

On Mon, 2003-03-24 at 20:21, ala...@at... wrote:
> Ok -- I tried enabling DMA on my Hard Drive with the hdparm command, and this is
> what I'm getting...
> 
> [alan@localhost alan]$ su
> Password:
> [root@localhost alan]# cd /sbin
> [root@localhost sbin]# ./hdparm -d1 /dev/hdc
> 
> /dev/hdc:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  using_dma    =  0 (off)
> [root@localhost sbin]#
> [root@localhost sbin]#
> 
> 
> I flipped throught the help for hdparm and I tried a bunch of other options to
> optimize both my hard drive, and my CD Rom, and it made a HUGE difference in
> performance -- however, it's still not perfect. I've found that the video skips
> almost with the same frequency as it used to, maybe a bit less, but the audio is
> now OK -- and doesn't skip nearly as much as it used to. The audio and video are
> always in sync -- regardless of how much skipping is occurring. I just don't
> understand why I can't run this command as root to enable DMA. It works on both
> of my hard drives, and my regular CD-RW drive, but not my CD-ROM. I can't figure
> it out.
> 
> Any thoughts?? -- I'm SOOOOOOOO close to getting this to work properly!
> 
> Thanks everyone for your input and suggestions -- I'm learning a great deal
> about Linux!
> 
> Alan
> > At 06:14 PM 3/24/2003 +0000, ala...@at... wrote:
> > >I did try the hdparm command at one point, and my shell reported that the
> > >command was not found -- i.e. 'hdparm' doesn't exist on my system. Do I 
> > >need to
> > >login as 'root' to run this command? I was running as 'alan' when I tried 
> > >last
> > >time. It sounds like it should be accessible from virtually all installations
> > >of Linux, including RedHat 8 which I'm running.
> > 
> > hdparm is usually, but not invariably, installed as part of a standard 
> > Linux install. I don't use RH 8.0. but I would expect a stock RH 8.0 
> > install to include it.
> > 
> > As you surmise, though, it is a "root" user command, not an ordinary user 
> > command. Ordinary users *can* run it, but only for limited purposes 
> > (typically for *getting* setting info but not for changing settings). So, 
> > yes, become root before executing it.
> > 
> > BTW, you're getting the "not found" response not because you lack 
> > permissions, but because it is not in your path. hdparm is normally in 
> > /usr/sbin, which is, conventionally, part of the executables path for root 
> > but not for ordinary users. If you run it as /usr/sbin/hdparm, you will (in 
> > all likelihood) find it "accessible" ... though as "alan" you will be 
> > limited in what you can get it actually to do.
> > 
> > 
> > 
> 
> 
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-- 
Florin Andrei

http://florin.myip.org/