I see that Fedora also removed it back in 2011 https://lists.fedoraproject.org/pipermail/scm-commits/2011-October/671714.html commit 3e1637b65790f195c6936e5b4e443c5ca9f37ed4 Author: Dave Jones <davej at redhat.com> Date: Fri Oct 14 13:13:34 2011 -0400 Disable CONFIG_ACPI_PROCFS_POWER which is supposed to be going away soon. "This option, together with the proc directories, will be deleted in 2.6.39."