Riccardo Mottola wrote: > "xbacklight" tells me however "100". > if I lower it with "-set 90" I actually notice it gets brighter, setting > it to "-set 100" .. it goes to full brightness. > > It looks as if initially the value is read back incorrect from a status > register?
There are a few instances of this bug. You can also see it with cpu frequency and audio volume. Most drivers maintain soft state that should mirror the hardware state. Except when it doesn't. Sometimes the driver has a bug, sometimes the hardware lies, sometimes something else goes wrong. The many layers of abstraction and acpi don't help either. It's a bug and it's worth reporting as much info about your hardware as possible, but don't expect a quick fix. As a workaround, just run 'xbacklight 50 ; xbacklight 100' or whatever you want.
