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Date: Wed, 20 Feb 2008 12:08:29 +0000
From: Jarek Poplawski <jarkao2@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: [BUG?] APM is hidden in menuconfig
Message-ID: <20080220120828.GD3885@ff.dom.local>
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Hi,

I needed APM to have poweroff on old box. So, in 2.6.24.2 menuconfig:

1) Power management options -->
   No APM.
2) [*] Power Management support
   No APM. I can see ACPI...
3) I try searching with "/" + "APM"
   APM [=n]
   Depends on: !X86_VOYAGER && X86_32 && PM_SLEEP && !X86_VISWS
4) I check above: all correct except:
   Symbol: PM_SLEEP [=n]
   No more "depends on".
5) Exit menuconfig - enter grep:
6) Some time wasting in arch/.
7) less kernel/power/Kconfig:
   config PM_SLEEP
        bool
        depends on SUSPEND || HIBERNATION
        default y
   ... 
   config SUSPEND
        bool "Suspend to RAM and standby"
        depends on PM
        depends on SUSPEND_UP_POSSIBLE || SUSPEND_SMP_POSSIBLE
        default y
        ---help---
          Allow the system to enter sleep states in which main memory is
          powered and thus its contents are preserved, such as the
          suspend-to-RAM state (i.e. the ACPI S3 state).

8) Back to menuconfig:
   [*] Suspend to RAM and standby

   Bingo! APM revealed! (And not even "DEPRECATED"!)

So, has it to be so hard? It seems not - at least in good old times...

Regards,
Jarek P.