Revert "upstream"

This reverts commit 72723176846981e635898d142e2c5e13672d9fcc.
Revert "Revert "upstream""

This reverts commit 1fd4c06ae5a4ec8774c628c17048b41e052cac16.
Revert "Add backlight notification support for Pico"

This reverts commit 1d64b3e152870f6054064907a9f4cd27a2b54a98.