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End-user customization and debugging:
* If a particular hook is causing problems on your system, you can disable it
using the HOOK_BLACKLIST environment variable by creating a file in
/etc/pm/config.d and adding the line:
HOOK_BLACKLIST="hookname 99another-hook"
* If a parameter (or lack thereof) passed to pm-suspend and friends is causing
problems, or you need to debug the suspend/resume process to work out what
quirks are causing problems, you can use the ADD_PARAMETERS and
DROP_PARAMETERS environment variables. To do this, create a file in
/etc/pm/config.d, and add the following lines to it:
ADD_PARAMETERS="--parameter-to-add --another-parameter"
DROP_PARAMETERS="--parameter-to-drop --another-parameter-to-drop"
If you want to drop all parameters (for testing purposes, or to work around
bugs in HAL), you can use DROP_PARAMETERS="all"
* If you suspect that a kernel module is preventing you from being
able to suspend and resume, you can use the SUSPEND_MODULES
environment variable to have that module removed when the system
suspends and reloaded when the system wakes up.
* To find out what parameters can be passed to pm-suspend and friends, run them
with '--help' as the first parameter as root. This will print out the
options that it supports and which hooks or modules handle those options.
Significant conceptual changes from pm-utils 0.99.x and earlier:
* Do not rely on the internals of hooks when configuring or customizing
pm-utils. Conceptually, hooks are black boxes from the point of view
of the pm-utils core code, and there is no guarantee that the implementation
of a given hook will not change from pm-utils revision to pm-utils revision.
* The preferred method of modifying the behaviour of a hook is to modify the
ADD_PARAMETERS and DROP_PARAMETERS to change the global parameters available
to each hook.
* All scripts created and maintained by the pm-utils are POSIX/SuS compliant.
Any modification or new script should be POSIX compliant and work as intended
using dash and posh before you submit a patch upstream.
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