linux-kernel - Re: Conflict between ide and usb?

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Message-Id: <20070316193902.d2514865.john@jcoppens.com>
Date:	Fri, 16 Mar 2007 19:39:02 -0300
From:	John Coppens <john@...ppens.com>
To:	lsorense@...lub.uwaterloo.ca (Lennart Sorensen)
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Conflict between ide and usb?

On Fri, 16 Mar 2007 16:34:15 -0400
lsorense@...lub.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
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