[Bug 229120] [acpi_ibm] [patch] Add support for newer Thinkpad models with id LEN0268

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229120

--- Comment #2 from Ali Abdallah <aliovx at gmail.com> ---
- Thinklight is reported by the firmware to be present, but turning it on does
nothing, probably is a reminiscence of old good Thinkpads! BTW, it behaves the
same under Linux.
- lcd_brightness is assumed to be controllable by the driver (the patch does
not change that). For instance it fails already to control the brightness on my
corebooted x230. This can be adjusted. 
- Sound mute works fine for me. However, mic mute does not mute the microphone,
it does only turn on its led. On Linux, if you mute the microphone via the
sound card driver, it checks if there is a thinkpad_set_led registered function
(by the thinkpad_acpi), and it does turn off/on the mic led for you. 

Event handling works fine for me.

The acpi_ibm driver is clearly unmaintained on FreeBSD. I can make a lot of
improvements to it, but unfortunately I have no access to its repository, and
going with patches takes ages...

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