Re: Conflict between ide and usb?

John Coppens
2007-03-16T22:39:10Z

On Fri, 16 Mar 2007 16:34:15 -0400
lsorense@csclub.uwaterloo.ca (Lennart Sorensen) wrote:

> Do you even have DMA enabled for the DVD drive? Without it it will be
> very slow and painful for the CPU. I also have noticed that many fast
> (16x) DVD writers must have an 80 wire cable or they won't work
> correctly and do nasty things to the system.
>
> Check /proc/ide/hdX/settings|grep dma and see if it says 1 0 1 or 0 0 1.

I _knew_ I enabled the DMA, but it seems that is switches off when I start
the transfer:

hdc: DMA disabled
hdc: ide_intr: huh? expected NULL handler on exit
hdc: ATAPI reset complete
ISO 9660 Extensions: RRIP_1991A
VFS: busy inodes on changed media.

This is on hdc, which is the DVD. Harddisk has DMA on.

John