I recently installed Linux, and it seems my brightness settings will not change. I have keys on my laptop for it, and they lower and raise the brightness bar but the screen does not change brightness. Help?
Some specs: My laptop is a HP dv7t-6100 CTO. I have Linux Ubuntu 12.04 lts dualbooted with Windows 7. I can provide more if you need to know.
Do you have acpi enabled? If so, do you have a /sys/class/backlight/ directory populated by folders named acpi_videoX, where X is some integer (normally 0 or 1)? If you do, check whether the brightness and/or actual_brightness files within those folders have their contents changed when you attempt to alter the brightness level. You might also consider installing the xbacklight package and checking whether it works to change your brightness settings.
