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Old 04-30-2003, 11:24 PM   #1
Registered: Apr 2003
Posts: 43

Rep: Reputation: 15
DVD DMA Dillema

so i've got this DVD-ROM/CD-RW combo drive made by LG, only problem is, i can't enable dma in linux!!! I managed to enable DMA in windows 98 (or so it seems right now) but the playback was still somewhat (although rarely) choppy.
here's my fstab:
LABEL=/                 /                       ext3    defaults        1 1
LABEL=/boot             /boot                   ext3    defaults        1 2
none                    /dev/pts                devpts  gid=5,mode=620  0 0
none                    /proc                   proc    defaults        0 0
none                    /dev/shm                tmpfs   defaults        0 0
/dev/hdc5               swap                    swap    defaults        0 0
/dev/hdb1               /mnt/D                  vfat    defaults,umask=0000 0 0
/dev/hda2               /mnt/C                  vfat    defaults,umask=0000 0 0
/dev/hdc                /mnt/dvd                iso9660 noauto,owner,kudzu,ro 0 0
/dev/cdrom              /mnt/cdrom              iso9660 noauto,owner,kudzu, 0 0
i know form watching my bios boot up that both cd drives are UDMA 33
and that DMA whatsits in the BIOS is set to auto (while IRQ seems to be set up 'manually' with a big list of irqs)
and looky here!
[root@elmer bennyp]# /sbin/hdparm -d /dev/hda /dev/hdb /dev/hdc /dev/hdd

 using_dma    =  1 (on)
 using_dma    =  1 (on)
 using_dma    =  0 (off)
 using_dma    =  0 (off)
IDE1 = hard disks
IDE2 = CDs

I read some mailing list backups on google that told me about a wild series of adventures in frustration and tearing computers apart that ended up helping this one guy, but fsck that!
i've tried switching the IDE cables to no avail. I think it's probably a software problem but i can't be sure, it could be hardware.

as I say, i watched my movie in win98 and it did much better. in linux it was skipping every second, in windows only occasionally and not that badly (which could be accounted for by windows' shittyness)

anyways i want to fix this up nice asap.
now i'm off to see if i can at least get the burner working.

edit: could this have something to do with which files point to which inside /dev/ ?? refresh my memory on how to take control of the wild jungle that is the dev section

Last edited by bennyp; 04-30-2003 at 11:25 PM.
Old 05-01-2003, 03:16 AM   #2
Registered: Feb 2003
Location: Netherlands
Distribution: debian (sid)
Posts: 693

Rep: Reputation: 30
you can enable dma for your dvd drive like this: hdparm -d1 /dev/hdc
(you have to be in a root console to use the hdparm command). add
this command to your startup script so that it is executed when you
boot your system.
Old 05-01-2003, 09:33 AM   #3
Registered: Apr 2003
Posts: 43

Original Poster
Rep: Reputation: 15
that's no good, i get HDIO_SET_DMA not permitted or whatever the error is


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