Charles - Thanks for your interest in my problem. I looked at the hardware file and it has this in it # # force dma to "on" for the following ide devices # DEVICES_FORCE_IDE_DMA_ON="" # # force dma to "off" for the following ide devices # DEVICES_FORCE_IDE_DMA_OFF="" Given that it says "ide devices" I don't know whether I'm allowed to put /dev/sr1 in here. Also - does it take a reboot to put the new options into effect or can I run SuSEConfig? Best wishes - Ken On Saturday 02 August 2003 3:11 pm, Charles Philip Chan wrote:

On Sat, 2 Aug 2003 15:03:08 +0100

Kenneth Payne wrote:

...

Can anyone tell me how I fix this?

You might be able to do it by putting the device name in /etc/sysconfig/hardware. Take a look at that file.

Charles

Charles -- Google is indeed my friend. hparm -d 1 /dev/hdd worked wonders for dvd playback. I'm once again a happy bunny. Thank you once again for all your help. Much appreciated. Best wishes - Ken On Saturday 02 August 2003 3:32 pm, Charles Philip Chan wrote:

On Sat, 2 Aug 2003 15:30:59 +0100

Kenneth Payne wrote:

...

Given that it says "ide devices" I don't know whether I'm allowed to put /dev/sr1 in here.

Google is your friend:

http://groups.google.com/groups?q=scsi+emulation+dma+turn+on+linux&hl=en&lr =&ie=UTF-8&oe=UTF-8&selm=5.1.0.14.1.20020819153832.020ec500%40celine.lucky.l inux.newbie&rnum=2

Charles

Charles - Thanks. I'll take a look at hdparm again, but DVD playback is great as it is. Best wishes - Ken On Saturday 02 August 2003 3:53 pm, Charles Philip Chan wrote:

On Sat, 2 Aug 2003 15:52:19 +0100

Kenneth Payne wrote:

...

hparm -d 1 /dev/hdd

You might want to add either the -c 1 or -c 3 switch also. This turns on 32-bit file access. Please refer to the hdparm manpage.

Charles

Ken - Thanks for your interest in my DVD problem. But I'm glad to say it's solved. I needed to switch on DMA for /dev/hdd. (It was Charles Philip Chan on this mailing list who sorted me out). Thanks again and best wishes. - Ken Payne On Saturday 02 August 2003 6:11 pm, Ken Schneider wrote:

-----Original Message----- From: Kenneth Payne To: suse-linux-e@suse.com Date: Sat, 2 Aug 2003 15:30:59 +0100 Subject: Re: [SLE] DVD jerky playback

...

Charles -

Thanks for your interest in my problem. I looked at the hardware file and it has this in it

# # force dma to "on" for the following ide devices # DEVICES_FORCE_IDE_DMA_ON=""

As it states IDE devices go here.

...

# # force dma to "off" for the following ide devices # DEVICES_FORCE_IDE_DMA_OFF=""

Nothing here unless you want DMA off.

...

Given that it says "ide devices" I don't know whether I'm allowed to put /dev/sr1 in here.

Also - does it take a reboot to put the new options into effect or can I run SuSEConfig?

Yes to both.

...

Best wishes

- Ken

On Saturday 02 August 2003 3:11 pm, Charles Philip Chan wrote:

...

On Sat, 2 Aug 2003 15:03:08 +0100

Kenneth Payne wrote:

...

Can anyone tell me how I fix this?

You might be able to do it by putting the device name in /etc/sysconfig/hardware. Take a look at that file.

Charles

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On Sat, 2 Aug 2003 19:55:22 -0400 BandiPat wrote:

So if you want it to have DMA turned on with each boot, then go to the file and add/dev/hdd to that line. ...

I prefer dropping the hdparm command into boot.local- that way you can specify more options. Charles -- "All language designers are arrogant. Goes with the territory..." (By Larry Wall)

Pat - Thanks for the clarification. I'd actually intended to use Yast2 to set the DMA mode so it lasted through reboots. I always knew you could do that for ide devices. My problem was that I wasn't sure of the relationship between scsi emulation and ide devices. I also didn't know which particular device represented /dev/sr1. By the way, what's all this about "reboots" - this is a Linux system. Uptime 72 days and counting! Anyway, thanks to everyone who gave me advice. Best wishes - Ken On Sunday 03 August 2003 12:55 am, BandiPat wrote:

Kenneth, What Ken was trying to point out in his mail was not so much how to fix your problem as how to make it a permanent fix. If you never reboot, just issuing the command hdparm will get it going, as you found out and it will last, until your next reboot. So if you want it to have DMA turned on with each boot, then go to the file and add /dev/hdd to that line.

# # force dma to "on" for the following ide devices # DEVICES_FORCE_IDE_DMA_ON="/dev/hdd"

Pat