Thinkpad t460 acpi issues

[Jung-uk Kim]

On 21. 3. 29., Kevin Oberman wrote:
> The best way to support these keys is to use devd to respond to them and
> dispatch to programs that can do what the key should do.
> 
> I wanted my new laptop brightness keys to work. pressing them had no
> obvious effect. I created the following file in /etc/devd/:
> notify 10 {
>         match "system" "ACPI";
>         match "subsystem" "IBM";
>         match "notify" "0x10";
>         action "/usr/local/sbin/L15-backlight.pl Brighter";
> };
> notify 10 {
>         match "system" "ACPI";
>         match "subsystem" "IBM";
>         match "notify" "0x11";
>         action "/usr/local/sbin/L15-backlight.pl Dimmer";
> };
> /*
> notify 10 {
>         match "system" "ACPI";
>         match "subsystem" "IBM";
>         action "logger Notify = $notify";
> };
> */
> and  trivial perl script (probably sh or python would be most people's
> choice) to actually do the job:
> #!/usr/local/bin/perl
> use strict;
> use Sys::Syslog;
> if ($#ARGV != 0) {
>   print STDERR "usage: L15-backlight.pl (incr|decr)";
>   exit 0;
> }
> #openlog("brightness", ,);
> my $new_bright;
> my $notify = $ARGV[0];
> my $curr_bright = `sysctl -n hw.acpi.video.lcd0.brightness`;
> if ($notify eq "Brighter") {$new_bright = ($curr_bright + 4)};
> if ($notify eq "Dimmer") {$new_bright = ($curr_bright - 4)};
> #syslog ("debug", "Notify = $notify, Old = $curr_bright, New = $new_bright
> ");
> `sysctl  -n hw.acpi.video.lcd0.brightness=$new_bright`;

For AMD and Intel GPUs, you may use backlight(8) with amdgpukms.ko or
i915kms.ko rather than sysctl(8) with acpi_video.ko.

Jung-uk Kim

> This adjusted the brightness by 5% on each press.You may notice that the
> adjustment is + or - 4, not 5. It turns out that the brightness keys worked
> fine, but only adjusted the brightness by 1%.
> 
> Similar devd entries can work for other keys. The final rule and the log
> statement in the script are commented out, but can be used to track down
> which key maps to which event  number.
> 
> I should thank the person who gave me the technique, but I can't seem to
> find the e-mail. My apologies to him.
> 
> Kevin Oberman, Part time kid herder and retired Network Engineer
> E-mail: rkoberman at gmail.com
> PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
> 
> 
> On Mon, Mar 29, 2021 at 6:16 AM Softwafe Engineer <timsofteng at gmail.com>
> wrote:
> 
>> Hello.
>> Freebsd 13 rc3
>>
>> I'm trying to enable acpi hotkeys on my thinkpad t460 but
>> unfortunately looks lite it unsupported.
>> I've loaded acpi_ibm and acpi_video but only three hotkeys works (on
>> my laptop it's fn+F(number)).
>>
>> As well I noticed strange behaviour on closing laptop cover. When I do
>> it then laptop starts to increase funspeed and no keys or trackpad
>> reaction after opening. Only reset works (long pressing on power
>> button).
>>
>> Is it possible to add supporting for my laptop?