[Bug 296261] Brightness keys doesn't work after loading i915kms on ThinkPad T420/X230 with Coreboot

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D296261

[email protected] changed:

           What    |Removed                     |Added
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                 CC|                            |[email protected]

--- Comment #3 from [email protected] ---
(In reply to lumiwa from comment #2)
I have been using the same devd configuration for several years going back =
to
my T4?0 system and still working on my current T16 (Intel Gen. 1). It's a b=
it
more complex, but does not need adjusting after a reboot:
notify 100 {
         match "system"                  "ACPI";
         match "subsystem"               "ACAD";
         match "notify"                  "0x00";
         action "/usr/bin/backlight 40; service power_profile $notify";
 };

notify 100 {
         match "system"                  "ACPI";
         match "subsystem"               "ACAD";
         match "notify"                  "0x01";
         action "/usr/bin/backlight 100; service power_profile $notify";
};

notify 100 {
         match "system"                  "ACPI";
         match "subsystem"               "IBM";
         match "notify"                  "0x10";
         action "/usr/bin/backlight +";
};

notify 100 {
         match "system"                  "ACPI";
         match "subsystem"               "IBM";
         match "notify"                  "0x1cpi_tz0: _CRT value is absurd,
ignored (-273.1C)1";
         action "/usr/bin/backlight -";
};

Thee first two stanzas deal with setting the brightness with AC power (100)=
 and
battery (40). You can adjust these values as you prefer. On my T16, I do log
errors when the power transitions with a single 0K sample:
acpi_tz0: _CRT value is absurd, ignored (-273.1C)
It's harmless.

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