[Bug 6920] HDIO_SET_DMA failed: Operation not permitted

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------- Additional Comments From jpakkane at yahoo.com  2005-04-12 09:45 UTC -------
> The cause is not clear

I see I was a bit unclear earlier, so let me specify. I have a NForce 2
motherboard with a SATA controller. It holds my hard drive sda, which is working
just fine. What is failing, however, is my regular P-ATA CD-ROM, which is hda
(so it's not the root disk). When I try to turn on DMA with hdparm I get the
same error message as the person who originally filed the bug.

My Debian unstable installation had this exact same bug. The reason was that
ide_cd module was loaded before the driver for NForce 2. This caused ide_cd to
grab hda, set it to PIO, and not give control to the NForce driver. I fixed it
by tweaking the module config scripts so that ide_cd gets loaded last.

(some details may be fuzzy since I don't have access to the machine rigth now)

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