Will I am indeed using the Radeon driver, however, for clarity, you are not looking inside the acpi_video0 directory for the other entries but rather its parent directory. Also it might not be called radeon_bl0 on your system.
Essentially if you list your /sys/class/backlight directory you will (probably) have multiple entries (one of which is acpi_video0). For example, I have two: acpi_video0 and radeon_bl0. You may have different entries, especially if you are using the fglrx driver. You need to go into each of these entries/directories one by one and try to adjust the brightness as described in my original post. Hopefully one of them will work. >From my (very limited) understanding, I think that this is the essence of the bug (i.e. the acpi_video0 interface device is not properly "hooked up" to the actual display adapter). Having said that, what do I know?! Many thanks -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1315834 Title: 1002:983d [Acer Aspire V5-122P] Unable to adjust screen brightness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1315834/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
