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ogle - installed but no sound and jerky picture.

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slave:
I had this problem too, it's because RH8 comes with DMA disabled for CDROM drives.  Don't ask why.  To enable it, edit /etc/modules.conf and add the line

options ide-cd dma=1

Now to turn on DMA for your DVD device, type

hdparm -d 1 <device name> (such as /dev/dvd or /dev/cdrom)

Not sure about sound, try the FAQ here:

http://www.dtek.chalmers.se/groups/dvd/faq.shtml

voidmain:

quote:Originally posted by Linux User #5225982375:
I had this problem too, it's because RH8 comes with DMA disabled for CDROM drives.  Don't ask why.  To enable it, edit /etc/modules.conf and add the line

options ide-cd dma=1

--- End quote ---


It must only be true for some drives. I have two CD drives in my desktop here (one CDRW and one read only drive) and both of them have DMA enabled according to hdparm. I didn't have to do anything special, it configured them that way at install time.

shuiend:
when i do
[root@localhost root]# hdparm -d 1 /dev/hdd

/dev/hdd:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)
that is the error message i get. Can any one explain howto make it use dma. Also what the hell is DMA?

voidmain:
That error would indicate to me that your drive doesn't support DMA transfers. DMA stands for "Direct Memory Access".

shuiend:
my dvd-rom drive manual says that is supports ide/ultra-dma 33Mbytes/sec. Would that mean that it supports dma in linux. i am using a cheap EPO dvd drive so that may be it. EPO is a company from taiwan and it does not have anything about the dvd-rom on there site. I think i might be emailing them tommorow about it.

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