I feel almost stupid asking a brightness question with all the similar ones out there, but I haven't yet found a working solution, so here goes:
HP dv3500 series laptop (dv3550eo - Scandinavian version) with a GeForce 9300M GS graphics card, drivers version 280.13 running on Ubuntu 11.10.
The system keys for changing brightness are Fn+F7 and Fn+F8, respectively, but nothing happens - I can't change the brightness.
A few of the tricks I've tried:
- The same tricks this Lenovo owner tried: Unable to change brightness in a Lenovo laptop
- this: http://ubuntuforums.org/showpost.php?p=11543948&postcount=40
- Triedls /sys/class/backlight/acpi_video0/brightness
- also for acpi_video1 and acpi_video2. Nothing was found for any of them.
I'm guessing it's a driver problem, but I've already installed the nvidia drivers (there was a popup upon first restart after install).
I apologize in advance for not reiterating the rest of the suggested fixes I've tried, as they are too numerous for me to remember, and have frankly left me exhausted.
I hope a user with a similar computer to mine has found a fix, elsewise I fear this shall be the fourth time over the years I've given Linux a crack only to give it up again within a fortnight :-/
Fingers crossed for a solution.