Kernel Question

[Jon Dixon]

I caught another mail thread about CD burning, which advised moving
S07hdparm to run later.

This appears to be working.

Most modern drives should have no issues with DMA, but I agree that a
lot of people try linux on some often nostalgic kit.

Appreciate knowing why that option was chosen.

- Jon

On Wed, 1 Dec 2004 10:36:43 -0800, Matt Zimmerman <mdz at canonical.com> wrote:
> On Wed, Nov 24, 2004 at 10:04:49PM +0000, Jon Dixon wrote:
> 
> > Since using Hoary, I noticed that the DMA for my DVD/CD-RW was not
> > enabled by default.
> >
> > Editing /etc/hdparm.conf to enable the DMA results in a message stating
> > that /dev/hdc doesn't exit, yet it obviously does.
> 
> Perhaps it doesn't exist until later in the boot process in your case?
> 
> > The I recalled a setting in the kernel config, so I took a look and found:
> >
> > CONFIG_IDEDMA_ONLYDISK=y
> >
> > As I didn't need to play with DMA in Warty, is this something that was
> > introduced?
> 
> Yes.  Too many CD-ROM devices simply fail to work correctly when DMA is
> enabled, and this causes many users to be unable to even install Ubuntu, so
> it is disabled by default.
> 
> --
>  - mdz
> 
> --
> 
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