Re: AHCI problem with hotplug

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On Thu, 11 Dec 2008 15:32:35 -0500
Tony Battersby <tonyb@xxxxxxxxxxxxxxx> wrote:

> I am having a problem getting Linux to detect hot-plugged SATA disks on my
> ICH7 AHCI controller (SuperMicro PDSME motherboard).  On any SATA port that
> already had a disk plugged in during BIOS POST, Linux will see the disk and
> detect hot-plug and hot-unplug events just fine.  On any SATA port that did
> not have a disk plugged in during BIOS POST, Linux will not see a disk no
> matter what.  Here are the different sequences of events that I have tried:

AHCI has a set of BIOS/Firmware set flags used to indicate which ports
are not hot pluggable and the kernel will honour that data and leave such
ports powered down.

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