The same for me, HP 450 G6, newest firmware installed through Windows.
After Googling around I wonder whether the problem might be in the "hp_wmi" module? It might be responsible for handling those shortcuts for brightness, but I have no idea how to debug it further. See: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1806681
The same for me, HP 450 G6, newest firmware installed through Windows. /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1806681
After Googling around I wonder whether the problem might be in the "hp_wmi" module? It might be responsible for handling those shortcuts for brightness, but I have no idea how to debug it further. See: https:/