hdparm bus state change failure

Alan Cox alan at redhat.com
Fri Mar 19 02:12:30 UTC 2004

On Thu, Mar 18, 2004 at 06:09:01PM -0800, Keith Lofstrom wrote:
> Around September 2004, the ability to hotswap IDE drives (in swap
> trays) appeared in the redhat 2.4.ac kernels;  this ability was in
> the release version of Fedora Core 1 with hdparm version 5.4. I
> believe this capability was implemented by Alan Cox, correct me if
> I am wrong.
> With FC1 release, the sequence to hotswap drive hdg is:
> unmount          /dev/hdg
> hdparm    -b 0   /dev/hdg
>                          (power off, change tray, power on)
> hdparm   -zb 1   /dev/hdg
> mount   /dev/hdg /mountpoint
> With FC2 test 1, both with the as-distributed 2.6.1-1.65 kernel
> and the updated 2.6.3-2.1.253 kernel, and version 5.5 hdparm,
> the bus off command  * does not work *:

2.6 does not support IDE hotswap. The maintainer for 2.6 decided to not
include it. This is unfortunate for anyone with a laptop or SATA on 3112

> What should I test next, before I submit a bug to bugzilla? 

I would recommend continuing to use 2.4, at least for now. I may get
annoyed enough to do some IDE patches for 2.6 to fix this but that
won't be before late May and its lower priority than the broken acard,
ncr5380, and atmel-wireless hardare support, all of which I need. August
might be a better estimate.


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