[ltp] Re: hotswap ultrabay and dma (for IBM Thinkpad T41p)

[Paul Ionescu]

Hi Nils,

On Mon, 24 Jan 2005 09:57:41 +0100, Nils wrote:

> Hi,
> has anybody an idea to hotswap dvd-rom and battery on a T41p ? I found the
> hotswap utility  (http://users.ox.ac.uk/~univ1377/). It is working fine. I
> can swap dvd-rom and battery, but I loose the dma modus after the first
> swap cycle.
> Only booting with dma support is working. I also found some comments in
> the list, but no solution. The idectl-utility and hdparm (-U / -R) is not
> working on my system. Then I get the message: HDIO_UNREGISTER_HWIF failed.
> I hope that somebody has an idea to patch the kernel or how to use the
> idectl-utility or hdparm (-U / -R) with correct parameters.

I have been searching for long time to activate dma after swapping, but no
success whatsoever.
Some said that is a problem in IDE driver.
I still wait for Alan Cox to post some ide hot-plug device patches which
would enable this.

Thx,
Paul