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Subject: Re: Lenovo T470s Questions
To: freebsd-current@freebsd.org
References: <CAD-FYmS_C2TjyZo+Af5T-Xk0H6Tty5CMyGNwZ3WFVdJTkLJJTA@mail.gmail.com>
From: Jan Bramkamp <crest@rlwinm.de>
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Date: Fri, 2 Feb 2018 11:11:15 +0100
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On 02.02.18 03:13, Bridger Dyson-Smith wrote:
> Hi list and Michael -
> 
> I received a T470s at work and decided to jump into the CURRENT end of the
> FreeBSD pool. I have a weird acpi_ibm issue and I'm not sure where to start
> trying to diagnose the issue.
> 
> # uname -a
> FreeBSD spanner 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r328126: Thu Jan 18
> 15:25:44 UTC 2018     root@releng3.nyi.freebsd.org:/
> usr/obj/usr/src/amd64.amd64/sys/GENERIC  amd64
> 
> I've loaded acpi_ibm via /boot/loader.conf:
> acpi_ibm_load="YES"
> 
> and the module shows as being loaded:
> # kldstat | grep acpi_ibm
> 8    1 0xffffffff8278e000 7570     acpi_ibm.ko
> 
> However, I don't have any of the sysctl knobs available; e.g.
> # sysctl -a | grep acpi_ibm
> #
> 
> or
>   # sysctl dev.acpi_ibm.0.fan_speed
> sysctl: unknown oid 'dev.acpi_ibm.0.fan_speed'
> 
> I've (tried) to look through the commit messages on svn-src-head, but I'm
> not seeing anything specifically related to acpi work, or I just don't know
> what I'm looking at (a definite possibility).

I made the same discovery on my T470s running FreeBSD 12-CURRENT. It has 
been a long time since Thinkpads were designed by IBM. The fan control 
works just fine without any special purpose module. The acpi_ibm module 
main usecase for me was always handling the special button events, but 
these days they are just secondary function on the regular function 
keys. Who needs an additional row of buttons on >2k€ laptop when you can 
waste the space on a large useless trackpad.