cant enable DMA for my dvdrom

[liraz]

Here is some useful output:
fc4 for me has been quite bad so far, complete freezing when watching dvds sometimes. and I am unable to restart X server(screen goes blank and nothing responds - but this is to bug people with for another time)

anyway so here is what happens

[root@localhost fg]# /sbin/hdparm /dev/hdb

/dev/hdb:
IO_support = 0 (default 16-bit)
unmaskirq = 0 (off)
using_dma = 0 (off)
keepsettings = 0 (off)
readonly = 0 (off)
readahead = 256 (on)
HDIO_GETGEO failed: Invalid argument
[root@localhost fg]#

[root@localhost fg]# /sbin/hdparm -d 1 /dev/hdb

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

[hinnerz]

I also have the same problem and i really have no idea why. if some one replied to this post it would be a huge help

[cyaconi]

any solution to this??

thankz

[mndar]

DMA should be enabled by default. Try updating udev

[cyaconi]

Originally Posted by mndar

DMA should be enabled by default. Try updating udev

do you mean "yum update udev" ???
Can you please give me a little bit details?? (newbie here )

by the way, my kernel version is 2.6.14-1.1637_FC4

Thank you very much.

[mndar]

Not much of a fan of yum but ya that would do.
You can get the rpm from the fedora update site http://download.fedora.redhat.com/pu...FC4.1.i386.rpm

[cyaconi]

yum says is nothing to update... maybe I'm running the latest version.
Do I need to execute or configure some file related to udev...???

thanks

[linmix]

I've got the latest version of everything and found I had some problems with K3B cd-recording so I checked for DMA and found it to be disabled.
#/sbin/hdparm -d1 -X sdma /dev/cdwriter
did the trick for me, but I remember having a similar problem some time ago and adding a line somewhere to a configuration file to enable dma at boot time.
I'll post if I can find it.

[linmix]

Found it!

adding:
options ide-cd dma=1
to /etc/modprobe.conf should do the trick