/proc/acpi/info not present in kernels >2.6.36
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#3 /proc/acpi/info not present in kernels >2.6.36
/proc/acpi/info was deprecated for a while and now it seems is removed in kernel 2.6.36, wmpower does not work without it:
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$ wmpower
Welcome to wmpower version 0.4.3...
CPU frequency scaling available
No power management subsystem detected
No power management support...
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Replacement should be /sys/module/acpi/parameters/acpica_version.
It´s a real pain that wmpower is not maintained anymore. Even worst it doesn´t work in Linux distros with later kernels