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Bug#521279: Bug#521280: acpid does support netlink, so the problem only affects thinkpad-acpi



Hi,

I was just wondering, why the Thinkpad special keys don't work when I
use a Debian kernel instead of my home-grown one and I stumbled over
this bug report ...

> Well, I just looked at the most up-to-date acpid, and it supports
> netlink.
> 
> Therefore, the issue is just that thinkpad-acpi wants you to get
> hotkeys from the input layer since kernel 2.6.23, 
Fair enough. But who gets them?

> and now finally the
> borrowed time is over in Debian installs, with the procfs event
> delivery being shut off.
Which leaves users out in the cold.

> What I wrote about a thinkpad-apci backwards compatibility mode was
> slightly incorrect...  teaches me to trust memories over one year old
> about stuff I never had to look back at, before writing something.
> The non-hotkey events go over netlink, yes.  But hotkeys go only over
> the input device, where they belong, and there is no driver switch to
> mess with that.
That's wrong. The default as of 2.6.31 is still to deliver them as both,
input events and ACPI events (see the `hotkey_report_mode' parameter
of thinkpad_acpi). But the ACPI events are only delivered through the
legacy interface /proc/acpi/event and not through netlink.

> This means that all configs that use acpid to process thinkpad-acpi
> hotkeys will break, and need to be ported over to HAL or something
> else that binds to input devices.
You are kidding, right? You don't seriously suggest that I have to
install HAL, D-BUS daemons and what not to be able to hibernate or
switch WIFI on and off.

> I think these bugs can be tagged "wontfix", and we just deal with it
> as the usual perils of using "unstable" and "testing".  It is
> probably a good idea to leave them open in the BTS for a while, in
> hopes that people will read them before filing more bugs.
Thanks for that.

> I don't think it affects any Debian standard config, but it will
> affect most of the local configs by end-users.
I would like to use a Debian standard config, however there doesn't
seem to be any alternative to acpid handling these events (HAL is _not_
an alternative). So what is the standard? I haven't found any daemon
that listens to input events and executes actions on them, like acpid
does. The only thing available is inputlirc, but that just routes them
to a socket which doesn't really gain you anything.

So either acpid is extended to also listen to button events, or a
daemon is provided, that does this. Until then, the only
alternative is to support /proc/acpi/event so acpid can be used for
the extra buttons.

Cheers,
harry

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