Can't activate DMA on Lite-On DVD
I can't activate DMA on any of my devices (DVD, HDD, or CD):
[root@er241 /home/er241]# hdparm -d1 /dev/hdd
/dev/hdd:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)
[root@er241 /home/er241]# hdparm -I /dev/hdd
/dev/hdd:
ATAPI CD-ROM, with removable media
Model Number: LITEON DVD-ROM LTD-165H
Serial Number:
Firmware Revision: CH0J
Standards:
Used: ATAPI for CD-ROMs, SFF-8020i, r2.5
Supported: CD-ROM ATAPI-2
Configuration:
DRQ response: 50us.
Packet size: 12 bytes
Capabilities:
LBA, IORDY(cannot be disabled)
DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=120ns IORDY flow control=120ns
I can see that my DVD should support UDMA2 but it won't activate. My distribution is Linux From Scratch 4.1 with a 2.4.22 kernel.
Can anyone help me with this problem? I'm sure I was able to activate DMA under Mandrake 9.1
Thanks,
Ed
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