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bug#643: 23.0.60; battery.el needs deprecated ACPI_PROCFS_POWER interfac

From: Sven Joachim
Subject: bug#643: 23.0.60; battery.el needs deprecated ACPI_PROCFS_POWER interface
Date: Sun, 03 Aug 2008 09:04:05 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux)

In recent Linux kernels, the information about battery status has been
moved from /proc/acpi/battery to /sys/class/power_supply.  It is only
available from the former place if the kernel has been built with the
ACPI_PROCFS_POWER option, which is deprecated:

,----[ /usr/src/linux- ]
|       bool "Deprecated power /proc/acpi directories"
|       depends on PROC_FS
|       default y
|       ---help---
|         For backwards compatibility, this option allows
|           deprecated power /proc/acpi/ directories to exist, even when
|           they have been replaced by functions in /sys.
|           The deprecated directories (and their replacements) include:
|         /proc/acpi/battery/* (/sys/class/power_supply/*)
|         /proc/acpi/ac_adapter/* (sys/class/power_supply/*)
|         This option has no effect on /proc/acpi/ directories
|         and functions, which do not yet exist in /sys
|         Say N to delete power /proc/acpi/ directories that have moved to /sys/

At least Debian ships kernels that are built without ACPI_PROCFS_POWER,
so battery.el will not work with them.


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