I've searched around and no solutions seem to work that worked for older models. Not sure what to do next.
I'm unable to change my brightness with the keys on the keyboard. I can however use the GNOME power management preferences dialog to do so and can use e.g.
echo 10 > /sys/devices/virtual/backlight/acpi_video0/brightness
And everything works great. When running xev I get no output for the brightness button presses or releases, and I don't have /proc/acpi/LCD or anything related to the screen.
Any help would be appreciated and I can post any relevant system information if it will help, just let me know what to do.
Here's the Pastebin link to acpidump.txt as requested.