enabling DMA for DVD playback

[daveReed]

I am fairly new to linux so please, bare with me. I have been searching the web to figure out how to enable DMA support for a DVD drive, but haven't been able to find anything short of recompling the kernel. I have the latest Fedora 5 stable kernel build and hdparm installed. Please let me know what I can do. Here is my output:

[root@localhost sbin]# ./hdparm -d 1 /dev/hdc

/dev/hdc:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)

[linmix]

for my cd-rom I had to add the following to /etc/modprobe.conf

options ide-cd dma=1

[daveReed]

thanks I will give it a try

[daveReed]

Originally Posted by linmix

for my cd-rom I had to add the following to /etc/modprobe.conf

I tried adding that line to me modprobe.conf file, reebooted, but still is sluggish for DVD playback

[bodger]

dave - try adding to your kernel boot line (/etc/grub.conf) the term:
hdc=noprobe

The line should now read something like this:

kernel /boot/vmlinuz-2.6.16-1.2122_FC5 ro root=LABEL=/ rhgb quiet hdc=noprobe

Although it won't read as DMA enabled, this fixed up my DVD issues.

Hope it helps.

[daveReed]

Originally Posted by bodger

dave - try adding to your kernel boot line (/etc/grub.conf) the term:
hdc=noprobe

The line should now read something like this:

kernel /boot/vmlinuz-2.6.16-1.2122_FC5 ro root=LABEL=/ rhgb quiet hdc=noprobe

Although it won't read as DMA enabled, this fixed up my DVD issues.

Hope it helps.

It woorked!... thank you so much for helping out this newb