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Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?
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I am trying to enable DMA mode on my dvd-rom to get enough speed to actually play a dvd. My drive supports DMA, so does the controller/motherboard, but I can get it to work. My HD is already running in DMA mode (set at startup), so I can't understand why the dvd doesn't work.
# hdparm -d1 /dev/dvd <-- As root, of course
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)
Do a search of the forums, I just noticed you are using RedHat and I recall there is a specific problem with enabling DMA on cdrom/dvdroms with RedHat, there's a setting you have to enter somewhere (I don't remember).