My brightness function keys always worked, but suddenly they stopped working as well as the “Reduce backlight brightness” option in Power Management Preferences :( Every time I unplugged my power cord the monitor dimmed automatically. Now not even with the function keys I get my brightness down. This happened in my HP Pavilion dv5-1020ep running Ubuntu 8.10 64 bits. Here some additional info after searching in the Ubuntu forums and Google:
My old laptop’s battery is dying, and I used that as an excuse to buy myself a new on :-) I had a HP Pavilion zt3240EA, and have been very happy with it. Nice machine. Still, age weights on every one. I’m gonna be installing Ubuntu 8.04.1 LTS Desktop Edition, 64 bits version, on my new HP Pavilion dv5-1020ep. Download and Burn a CD Go to Ubuntu Download Page and download Ubuntu.