I can turn the DMA on for my two harddisks (hda hdb) but when i try for the DVD-Writer I get:

hdparm -d 1 /dev/scd0

/dev/scd0:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Invalid argument


hdparm -v /dev/scd0 # returns:
/dev/scd0:
readonly = 0 (off)
readahead = 256 (on)
HDIO_GETGEO failed: Invalid argument


My System is the following:
Duron600 @ GA-7X (VIA 133)
BenQ DW1620Pro <- as hdc-scsi emulation
Debian Kernel 2.6


Any ideas how to turn DMA on / why it doesn't work?

As root

hdparm -d1 /dev/scd0

Methinks the space is causing probs

hdparm -d1 /dev/scd0
returns the same...

Having the same problem, i'm using two S-ATA disks and a 8 speed DVD burner, which only burns at 1 speed.

Arjan

Hi Arjan,

I got some questions:

Which chipset do you have ?
Also the BenQ DVD-writer ?
Did you try to burn under Windows ?

I didn't since I don't have Windows here, but allready thaught of checking it in an other OS, if I could exclude demaged hardware I could set my efforts towards the software part.

Thanks in advance.

Oh, 8x speed, so its an other writer i guess.

But since they burn allready (I heave maneged to burn 2.8x with my 16x burner) I guess the hardware should be OK - especially since google throws out only a hand full results searching for "damaged DMA"

Ok I mostly solved it by installing the chipset-drivers - either module or included in the kernel - i compiled the kernel new with KT133-specific driver via82cxxx included

It's odd that I could turn on DMA for my drives with the comon chipset driver - but not for my dvd.

I can burn a DVD+R 8x in about 8-9 min. regarding my slow CPU (Duron 600) its ok I guess - some take 10min.

The kernel version 2.6 does not need to do SCSI emulation for a an IDE recording drive. Try not using hdc=ide-scsi or hdd=ide-scsi in your boot loader.

You can try hdparm -d1 /dev/hdc or hdparm -d1 /dev/hdd.

SCSI drives does not use DMA.

I don't know which chip set i use, i have a ASUS P4P800 bord.

I have a Plextor 708 burner, i have used the burner with XP, and there were no probs, burning a DVD takes up to 10 minuten, but with Linux it takes about 30 to 60 minutes.

I have never seen my burning speed above 1 speed.

Arjan

I have tried both settings, but nothing seems to solve the problem, i will take a look at the driver for my chipset, but first need to find the chip set i'm using :-)

Arjan

So it wasn't the chipset alone that solved the prob over here. I've while compiling the new kernel also switched from scsi-emulation to ATAPI-Support, since the kernel-config info told me scsi-emu is not longer required for burning. And it seems you can't access your drivesetting with 'hdparm' when in scsi-emu mode.

I would suggest you have 2 choices:

the easy way:
"modprobe ide-cd" as root to load it as module.
remove the scsi-emu stuff from lilo.conf, run lilo, and reboot - you than should load the atapi-module and not the scsi-emu - dvd is at /dev/hdx (x = a,b,c,d...)

or
kernel-implanted: you start kernel-config by 'make menuconfig' you should find the ATAPI-module in
"Device Drivers ---> ATA/ATAPI/MFM/RLL support --->Include IDE/ATAPI CDROM support"
I've also included the chipset-specific driver which are in "Device Drivers ---> ATA/ATAPI/MFM/RLL support" too - look up at your mainboard's manufacturer website for info about your MB and check for a match in the kernel-config. If you'r unsure it may also work in the ide-generic driver.

Don't forget to change the mountpoint-settings if you want to read from that drive. Your dvdrom will be depending on which IDE-port you've it in, slave 2nd will be /dev/hdd for example.

But,

Won't get any dma on to cd and dvd. I have no other ide devices.

I'd like to post my menuconfig to here if somebody could verify that i've done the setup right. I myself have checked many times and think it's ok. I picked amd/nvidia ide module for my setup(thinking it was for my ide) from kernel setup. But I allso picked ide-generic and ide-cd.

I have an abit nf7-s board, nforce2 ultra400.

I have ide generic and ide-cd is loaded(automaticly) Havent even tried to go with scsi emu but its still loaded?
Might it be that it isnt needed for my sata controller or what?

I have an other post on this subject too sry. Didn't find this till now.

My old post is named : can't get dma to cd and dvd

It has links to my lspci lsmod and dmesg outputs...

Losing hope of burning and watching dvd:s on linux