IBM thinkpads and ultrabay hotplug (new info)

IBM thinkpads and ultrabay hotplug (new info)

[Paul Ionescu]

Hello all,

There were some posts a couple of months ago about hotplugging of
ultrabay devices in IBM thinkpads or other laptops.
The resolution at the time was that IBM is not providing info about how
it works in order to develop some drivers for it.

Since then, I was playing a lot with some IBM Tseries thinkpads and I
noticed that when you hotswap some device on ultrabay, the system sends
ACPI notification for the specific devices.
I enabled the debugging option in ACPI and I was able to capture some
ACPI events related to hotswapping the devices in ultrabay.
I tested this with several devices like: cdrom, dvdrom, cd/rw, floppy,
battery, and with acpi enabled it works without powering off, or
suspending the laptop for swapping a device, only a idectl is needed
(hdparm -U/-R).

However, without a proper acpi module to handle these notifications, we
cannot do much hotplug things.
My question is what should do such an ACPI module ?
We could send some hotplug events, and let hotplug interface do the
rest.
We could use the /proc/acpi/event interface and let the "acpid" handle
the change.
Maybe we can do other things I don't thing about right now.

What is the preffered way to handle it ?




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Re: IBM thinkpads and ultrabay hotplug (new info)

[Christian Zoz]

On Sun, Mar 14, Paul Ionescu wrote:
> 
> However, without a proper acpi module to handle these notifications, we
> cannot do much hotplug things.
> My question is what should do such an ACPI module ?
> We could send some hotplug events, and let hotplug interface do the
> rest.

Yes.

> We could use the /proc/acpi/event interface and let the "acpid" handle
> the change.

No.

-- 

ciao, christian



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