[Bug 247306] [acpi_ibm] [patch] add cpu fan full-speed level

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247306

            Bug ID: 247306
           Summary: [acpi_ibm] [patch] add cpu fan full-speed level
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: ali.abdallah at suse.com

Created attachment 215613
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=215613&action=edit
Add support for running fan in full-speed mode

My x220 sometimes runs hot on FreeBSD (when pushing it to its limit). And I
start receiving coretemp messages:

> coretemp0: critical temperature detected, suggest system shutdown

Unfortunately auto mode never sets the fan to spin fast enough to cool down the
cpu, neither level 7 (max currently supported by the driver). The driver does
not support full-speed (disengaged mode). Attached is a patch to implement
that, with documentation updates. Tested on x220, x230, T430 and T61.

(Since I submitted many patches in the past to improve acpi support for
Thinkpads, I added my name, but feel free to strip it off).

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