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Date:      Sat, 20 Apr 2024 23:44:51 +0000
From:      bugzilla-noreply@freebsd.org
To:        x11@FreeBSD.org
Subject:   [Bug 278477] x11-servers/xorg-server regression (?) - hardware brightness adjustment blocked in X (T400)
Message-ID:  <bug-278477-7141-hjLElqJO3F@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-278477-7141@https.bugs.freebsd.org/bugzilla/>
References:  <bug-278477-7141@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D278477

rkoberman@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rkoberman@gmail.com

--- Comment #2 from rkoberman@gmail.com ---
Sorry, but I can only guess at the meaning of "Fn + key  do not five separa=
te
xev outputs so they are intercepted (?), similarly to LED light combination=
."

Also, does backlight(1) work on the system? It should work with any interfa=
ce
that works with i915kms. That will not solve your problem, but says that
brightness does work.

On m T16, I use the following in /etc/devd/thinkpad.conf to get brightness =
+-
to work, but I am not sure that the values 0x10 and 0x11 are universal on
ThinkPads. acpi_ibm.ko must be loaded.

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"                  "0x11";
         action "/usr/bin/backlight -";
};

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