[Bug 181283] [acpi_ibm] acpi_ibm module is useless on ThinkPad W530

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=181283

John Baldwin <jhb at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jhb at FreeBSD.org

--- Comment #1 from John Baldwin <jhb at FreeBSD.org> ---
Other thinkpads that use Intel integrated graphics are able to control LCD
brightness via the KMS module after r270516 in HEAD (merged to stable/10 in
279961 which is after 10.1).  However, those do not use acpi_ibm, but do work
with acpi_video.  On my x220 the following things appear to work in acpi_ibm:

'mute' sysctl (can write to it to mute, and the mute button change its state,
also writing to it changes the mute light)
'thinklight' sysctl
'fan_speed' sysctl

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