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

From: Sven Joachim <[email-masked]>
Date: Sun, 03 Aug 2008 09:04:05 +0200

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-2.6.26.1/drivers/acpi/Kconfig ]
| config ACPI_PROCFS_POWER
| 	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|           they have been replaced by functions in /sys.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.

Sven