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Not permitted to set DMA ???

Hi all,

I'm trying to set the DMA to on for my hd without much success. I have pasted below all the information I think is relevant. I'm doing all the below as root, and as you can see, somehow setting the DMA is not permitted. My computer is about 6 months old, and I'm running the 2.4.18-k7 kernel.

The error I get when using "hdparm -d1 /dev/hda" as root (root should be allowed to do this right??):
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma    =  0 (off)

The chipset and other info about my hd from dmesg:
hda: IC35L080AVVA07-0, ATA DISK drive
hda: 160836480 sectors (82348 MB) w/1863KiB Cache, CHS=159560/16/63

Result of "hdparm /dev/hda":
multcount    = 16 (on)
I/O support  =  3 (32-bit w/sync)
unmaskirq    =  1 (on)
using_dma    =  0 (off)
keepsettings =  0 (off)
nowerr       =  0 (off)
readonly     =  0 (off)
readahead    =  8 (on)
geometry     = 10011/255/63, sectors = 160836480, start = 0
busstate     =  1 (on)

and the result of "hdparm -i /dev/hda":

Model=IC35L080AVVA07-0, FwRev=VA4OA50K, SerialNo=VNC400A4G4PMSA
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=52
BuffType=DualPortCache, BuffSize=1863kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=160836480
IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5
AdvancedPM=yes: disabled (255) WriteCache=enabled
Drive Supports : ATA/ATAPI-5 T13 1321D revision 1 : ATA-2 ATA-3 ATA-4 ATA-5

and the result of "hdparm -tT /dev/hda":
Timing buffer-cache reads:   128 MB in  0.50 seconds =256.00 MB/sec
Timing buffered disk reads:  64 MB in  9.97 seconds =  6.42 MB/sec

Any help would be mostly appreciated

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