With no CMDLINE option, I have an acpi_video0 symlink in /sys/class/backlight, and it behaves as I described above (brightness file responding to FN Keys and the sytem tray slider from 0-100, screen brightness stuck at 100). I have tried manipulating my grub command-line options as per another forum post (can’t link), but that didn’t seem to help: When I first installed Manjaro some months ago the brightness keys worked (in a janky way: the brightness up worked but brightness down set brightness to 0/turned off the display), but either a kernel update or switching to proprietary NVIDIA drivers seem to have cut off the connection between my actual screen brightness and the brightness values I can manipulate, so I have been primarily using my windows install at night but want to get back to pure Manjaro. The Fn Keys and the brightness slider in the power manager system tray both appear like they’re working, in that the XFCE brightness pop-up is displayed and adjusted as expected and the values in the brightness file of /sys/class/backlight change, but the actual screen brightness seems stuck at 100%.
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