I run BT55R2 on an Acer Aspire One D270 and I only have the issue that the brightness can't be set through Fn-Keys or the GUI (Power Management).
I've found a How-To for re-enable changing of the brightness here, but haven't tested it yet.
I'm now using another trick. Try
I'm still searching a better solution, but until I found something I'll use this. 100% brightness is too much.Code:setpci -s "00:02.0" F4.B=[VALUE IN % HERE]
Let us know if this command works for you too!