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Old 10-03-2003, 03:57 PM   #1
LQ Newbie
Registered: Aug 2003
Distribution: rh9
Posts: 11

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Unhappy RH9 enabling DMA for DVD/CD/CDRW combo

Hi there,

I was wondering if someone can help me with my problem. For some unknown reason I can't enable any DMA for my DVD/CD/CD RW combo which seems to be essential for smooth playing of my DVDs. I'm running on RH9. I've tried this

[root@localhost root]# hdparm -c3 -d1 -X sdma1 -u1 /dev/hdc

and this is what I got from it:

setting 32-bit IO_support flag to 3
setting unmaskirq to 1 (on)
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
setting xfermode to 17 (singleword DMA mode1)
IO_support = 3 (32-bit w/sync)
unmaskirq = 1 (on)
using_dma = 0 (off)

Everything is all right except for the last line in that message. I put this line into /etc/modules.conf

options ide-cd dma=1

but when I restarted I got this in /var/log/messages

Oct 3 20:41:43 localhost kernel: Kernel command line: ro root=LABEL=/ hdc=ide
Oct 3 20:41:43 localhost kernel: ide_setup: hdc=ide -- BAD OPTION

In order to disable SCSI emulation of my IDE combo device I've deleted hdc=ide-scsi in my grub.conf so now it looks like this

kernel /vmlinuz-2.4.20-8 ro root=LABEL=/ hdc=ide

If I run this
[root@localhost root]# hdparm -d1 /dev/hdc

I got this

setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)
[root@localhost root]#

Can anyone help me to sort this out please?



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