Problem to turn DMA on

["Rafael Fontenelle" <rffontenelle@gmail.com>]

Hi all.

I got a very old notebook running debian 4.0 with kernel 2.6.25 and 2.6.21.
It has a 4GB IDE harddisk. I'm trying to enable DMA with hdparm, but it is not working.

The command I run and its output are:

# hdparm -qc3 -qm16 -qd1 -qX66 -qS120 /dev/hda
 HDIO_SET_DMA failed: Operation not permitted

Did someone get this message before or know to solve it?

Thanks,

Rafael