apple_display_brightness_increment and decrement broken on macOS Big Sur

[michaelsilver]

• Software: Karabiner-Elements v13.1.0, macOS Big Sur 11.0.1
• Hardware: Built-in Retina Display and Apple Thunderbolt Display
• Expected behavior: apple_display_brightness_increment and apple_display_brightness_decrement adjust brightness of thunderbolt display (as worked on macOS Catalina)
• Current behavior: while the keys register correctly (pasted EventViewer log below), thunderbolt display brightness doesn't change. On the other hand, apple_top_case_display_brightness_increment and apple_top_case_display_brightness_decrement appear to work fine (and adjust the laptop's brightness)

These keys do nothing (in Catalina these adjusted the Thunderbolt Display brightness):

type:key_down        code:65551      name:apple_display_b misc:
type:key_up          code:65551      name:apple_display_b misc:
type:key_down        code:65550      name:apple_display_b misc:
type:key_up          code:65550      name:apple_display_b misc:

These keys adjust the brightness of my laptop screen:

type:key_down        code:65552      name:apple_top_case_ misc:
type:key_up          code:65552      name:apple_top_case_ misc:
type:key_down        code:65553      name:apple_top_case_ misc:
type:key_up          code:65553      name:apple_top_case_ misc:

[michaelsilver]

I've also tried the following replacements with no avail:

• display_brightnes_increment/decrement
• vk_consumer_brightness_up/down
• key_code::display_brightness_increment/decrement

[michaelsilver]

Workaround update: remapping the desired keys to the following worked for me:

key: "scroll lock" to decrease brightness key: "pause" to increase brightness

Credit to https://apple.stackexchange.com/a/129291

[HUANYU2015]

Setting the devices/advance is not valid!

[ebelinski]

Workaround update: remapping the desired keys to the following worked for me:

key: "scroll lock" to decrease brightness key: "pause" to increase brightness

Credit to https://apple.stackexchange.com/a/129291

Thank you @michaelsilver, this worked for me. More specifically, what I did was go to Karabiner-Elements Preferences > "Function keys" tab and changed f1 to scroll_lock and f2 to pause. Now I can use F1 and F2 to decrease/increase brightness again in macOS Big Sur. Here is what my configuration looks like:

[AndrewHaglund]

scroll_lock (f1) and pause (f2) are both under the Keys in pc keyboard category in the dropdown.

Took me a couple minutes to find those actions so I figured I'd share. Thanks for sharing the workaround!

[dlejay]

Same problem here on a Mac Studio + Studio Display, macOS Monterey.

Hand fix: map F1 and F2 to brightness_down and brightness_up instead of apple_display_brightness_decrement and apple_display_brightness_increment.

[andrewzey]

Same problem here on a Mac Studio + Studio Display, macOS Monterey.

Hand fix: map F1 and F2 to brightness_down and brightness_up instead of apple_display_brightness_decrement and apple_display_brightness_increment.

This resolved the issue for me as well. Thanks!

Running 16" M1 Max Macbook Pro on MacOS Monterey 12.6 with an Apple Studio Display