Keith Winston wrote: >I have an IDE DVD drive (/dev/hdc) and I would like to turn on DMA to >speed up playback of movies in ogle. > >In SuSE 8.0, I am able to use: >hdparm -d1 -X34 /dev/hdc >to turn on DMA and it makes a huge difference in playback frame rates. > >When I use this command (as root) in Red Hat 8.0, I get an error... >/dev/hdc: > Setting using_dma to 1 (on) > HDIO_SET_DMA failed: Operation not permitted > using_dma = 0 (off) > >I verified that the device was owned by root and rw for root. Does >anyone know why this doesn't work? > > > Red Hat is using a different version of the ide driver than most other distros. It will refuse to turn on dma on certain chipsets. For example RH 7.3-8.0 refuses to turn on dma on any Serverworks OSB4 chipset. I'd advise using either 2.4.19, or 2.4.20pre8-ac3 if you want to use dma.
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