ACPI preventing hotplug from working

ACPI preventing hotplug from working

[Dennis Lichtenthäler]

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Hi everyone!
I'm not sure I'm right on this list but neither the gentoo nor the
hotplug-guys were able to help me out...

Whenever I plug a USB device in _before_ boot it gets recognized as soon as
the hotplug-script is loaded, the modules get loaded and everything works like
a charm. If I plug the device in _after_ boot, nothing happens. There is no
sign at all that linux recognized me changing something.

I have tried the usual suspects and found out that it obviously had something
to do with ACPI as switching it off at boot (with acpi=off) fixes the problem.
I googled a bit and found that problems like this could be caused by a buggy
DSDT. After some more googling I found out how to disassemble it, did so,
found four or five errors, fixed them, recompiled the DSDT, had it load by the
kernel but - nothing changed. I'm told that the default DSDT is overridden by
a user-defined one (ACPI-0291: *** Info: Table [DSDT] replaced by host OS) so
my patching actually worked but it doesn't solve the problem.

Booting with
acpi_os_name="Microsoft Windows XP"
hasn't worked either.

I've tried different kernels now, the gentoo-supplied 2.6 one (I think it was
2.6.5) as well as the most recent 2.6.7-gentoo-r14. The same problem also
appeared on a default install of SuSE 9.1.
It is definitely not a hardware problem since with WinXP Home and with ACPI
disabled (on any kernel) hotplug works.

What makes this problem so incredibly annoying is that I can't seem to find
any starting point for debugging as there is no reaction to my plugging
in/plugging out at all.

Any tips would be greatly appreciated!
Dennis
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