Not 100% sure but possibly some (one?) EisaId are (is) missing in
ibm_ids definition of sys/dev/acpi_support/acpi_ibm.c.
Currently it contains "IBM0068" and "LEN0068".

Run `acpidump -d -t | fgrep EisaId` as root on your T470s and look for
EisaId something other than...


If there's something new, insert them (it) to 
  static char    *ibm_ids[] = {"IBM0068", "LEN0068", NULL};
line of sys/dev/acpi_support/acpi_ibm.c, between "LEN0068" and "NULL".

If there's none, it's over my hand. :-(
There could be some incompatibility, like struct member change etc.

See my web page [1] of part "Note for limitations of ACPI in ThinkPad
T420" and The FreeBSD Forums' thread noted there [2] for more info.
Although old, but part of them can be useful.


On Thu, 1 Feb 2018 21:13:05 -0500
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
> 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).
> Would someone be able to provide a bit of debugging direction here?
> Reviewing `dmesg -a` doesn't tell me anything specific about acpi_ibm.
> Thanks in advance for your time and trouble.
> Bridger
> _______________________________________________
> mailing list
> To unsubscribe, send any mail to ""

Tomoaki AOKI    <>
_______________________________________________ mailing list
To unsubscribe, send any mail to ""

Reply via email to