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The powermanagement callouts are in the default hal config
(org.freedesktop.Hal.Device.SystemPowerManagement and
org.freedesktop.Hal.Device.LaptopPanel) can be used by users in group
powerdev. The storage callouts (org.freedesktop.Hal.Device.Volume.*) can by
used by users in the group plugdev.
The acpi addon won't use the kernel acpi events interface but the acpid's
event socket if acpid is installed. If acpid is removed, hal needs to be
restarted to enable monitoring of acpi events again. And if apci is installed,
hal needs a restart to free the kernels acpi events interface for acpid.
Some CD and DVD drives, such as the GDR8162B model found in some Dell
laptops, do not correctly handle media status inquiries and incorrectly
spin up the drive when they should not. Since hal regularly polls CD
drives for media changes, this results in increased power consumption and
mechanical wear and tear on such drives, which remain spinning constantly
while hal is running.
If you have a CD/DVD drive exhibiting this problem, you can copy
/usr/share/doc/hal/examples/no-cd-media-check.fdi to /etc/hal/fdi/policy/ to
disable media checks for your drive. This file disables media checks for
all CD drives on the system, and also includes an example config for
disabling media checks only on a specific drive.
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