Intel-backlight

[rasmusj78]

Hi,

So my FN keys on my T480 laptop from Lenovo doesn't work in XFCE in FreeBSD 14.1 doesn't work. Anyhow I went to install the package "intel-backlight" and I wasn't able to install it (see attachment).

How can I get this package installed or get the backlight keys to function properly?

Thanks!

 

[Kai Burghardt]

Welcome to the FreeBSD forums!

Note: graphics/intel_backlight (port names use underscores, not dashes; a dash separates the version number) expired on 2024‑07‑01 and was deprecated in favor of backlight(8) (already part of the base system, no installation of additional software necessary).​

LOL, did you seriously show us a photo of what the increase/decrease brightness keys are⁇ As if we didn’t knew?

 

[rasmusj78]

Thanks very much!

 

[cmoerz]

Do you have graphics/drm-kmod installed? I believe that's going to be required to make graphics and backlight work properly for this notebook?

 

[shurik]

backlight(8) from base can be used to control brightness. As suggested earlier graphics/drm-kmod is required. To control brightness with Fn-keys you need acpi_ibm(4) kernel module loaded and this in devd(8) configuration:

     notify 100 {
             match "system"                  "ACPI";
             match "subsystem"               "IBM";
             match "notify"                  "0x10";
             action "/usr/bin/backlight + 5";
     };
    
     notify 100 {
             match "system"                  "ACPI";
             match "subsystem"               "IBM";
             match "notify"                  "0x11";
             action "/usr/bin/backlight - 5";
    };

 

[rasmusj78]

Do you have graphics/drm-kmod installed? I believe that's going to be required to make graphics and backlight work properly for this notebook?

Hmm, not sure

 

[rasmusj78]

backlight(8) from base can be used to control brightness. As suggested earlier graphics/drm-kmod is required. To control brightness with Fn-keys you need acpi_ibm(4) kernel module loaded and this in devd(8) configuration:

     notify 100 {
             match "system"                  "ACPI";
             match "subsystem"               "IBM";
             match "notify"                  "0x10";
             action "/usr/bin/backlight + 5";
     };
   
     notify 100 {
             match "system"                  "ACPI";
             match "subsystem"               "IBM";
             match "notify"                  "0x11";
             action "/usr/bin/backlight - 5";
    };

Where does this go? Sorry for being such a noob, lol

 

[shurik]

For example /usr/local/etc/devd/thinkpad-backlight.conf. Do not forget to restart devd:

service devd restart

 

[drr]

Scrolling mouse over the battery monitor icon on the panel used to adjust brightness on a thinkpad 480 that I have used once; not sure if it was Xfce desktop or KDE.

 

[Krolingo]

I was having this same problem with my T480s. I followed the manual and set it up like this, following the example presented. At some point I had created the scripts shown here https://www.davidschlachter.com/misc/freebsd-acpi_video-thinkpad-display-brightness but this is much easier.

     notify 100 {
             match "system"                  "ACPI";
             match "subsystem"               "IBM";
             match "notify"                  "0x10";
             action "/usr/bin/backlight -f /dev/backlight/backlight0 + 5";
     };

     notify 100 {
             match "system"                  "ACPI";
             match "subsystem"               "IBM";
             match "notify"                  "0x11";
             action "/usr/bin/backlight -f /dev/backlight/backlight0 - 5";
     };