Comment 42 for bug 333386

Yeah, sysfs has a lot of recursion. So that confirms the wmi driver is at least registering itself. The interesting variables would be actual_brightness, brightness, max_brightness and maybe bl_power.
From one of the earlier posts, I take it that all values are 9. And even if you "sudo -i" and then "echo 4 >brightness" nothing changes? Both actual_brightness and brightness stay at 9? Is the anything logged to dmesg at that point?