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Bug#704815: Would it be possible to reenable CONFIG_ACPID

06.04.2013 16:02, Guido Trotter wrote:
> On Sat, Apr 6, 2013 at 11:05 AM, Michael Tokarev <mjt@tls.msk.ru> wrote:
>> 06.04.2013 12:56, Guido Trotter wrote:
>>> Package: busybox-static
>>> I know that acpid was disabled on purpose, but would it be possible to
>>> reenable it? It is useful on VMs running with busybox only, for example.
>> For many years, i've the following "replacement" for acpid:
>> while read x < /proc/acpi/event; do
> CONFIG_ACPI_PROC_EVENT is deprecated and unset in most modern kernels

I know it's been deprecated, but I always used local builds of kernel
(together with my initramfs and a few other infrastructure), so I
didn't know it's been turned off.  That's a pity.

> (I know, I can always build my own kernel, but then again, I could
> also build busybox, so that defeats the purpose). acpid in busybox can
> read /dev/input/event* and at least under Xen does the right thing
> (shuts down the system, with the proper config).

Do you aware that any keyboard/mouse/etc event will be read by acpid
using this /dev/input/event* "interface"?  That was my main complain
when this interface has been introduced - there's no way to filter
out things to stop kernel to wake all readers for every and all input
event even if 99.99% the readers aren't interested in it.  At least
acpid can be a bit smarter and only open those devices which actually
provide buttons we're interested in, like pwrbtn/lidbtn, instead of
reading every mouse and force-feedback device out there.  Oh well.

Fortunately it might be not as bad for a VM where you don't work at
the console.

But this is just, well, complaining, I understand that the whole
(linux) world already works like that.

>> Is it not sufficient for you?
>> If you talk about VMs, I found it is much easier to use Ctrl+Alt+Del
>> from inittab to signal shutdown, and don't bother with acpi at all.
>> For this to work, just change cad action in /etc/inittab to do
>> power down instead of reboot.
> Under kvm I can always go for the "ctrl+alt+del" option you suggest,
> but that still requires special knowledge that the machine does the
> right thing, while acpi is supposed to be more standard. Anyway I am
> not sure I could easily do that under Xen too.

I see.  This, together with ACPI_PROC_EVENT, are both good points.

>> As for enabling this applet for wheezy, it definitely is not possible
>> at this time because of the freeze.
> Understood, I only mentioned it because it was enabled in squeeze
> before, but then again probably busybox is too important to allow
> exceptions. Well, maybe it can still be discussed and updated in
> wheezy+1 and backports, perhaps?

Backports - sure.  For wheezy, I'll have to explain to the release
team why fixing this bugreport is important for wheezy, and I'm
afraid I can't do that even to myself ;)

Your usage is very specific.  There's absolutely no reason why it
should be forbidden, obviously, and I will, most likely, turn this
options back on for jessie - for both regular and static builds -
but this wont be for wheezy.  I'm sorry to say that.

Thank you for the feedback and the bugreport!  Seriously, it is
always nice to know which applets people use for real and which
are dummies.


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