Could PhoneAlarm be the culprit?
I don't know about a SPB product causing this but did you happen to install and uninstall PhoneAlarm recently? After I uninstalled PhoneAlarm, I could not adjust the brightness of the lcd. Instead of hard resetting, I ended up reinstalling PhoneAlarm 1.65, adjusting all the profiles to "Leave Unchanged", unchecked every item in PA, removed it from the today screen via Settings and uninstalled it. After I rebooted, I was able to adjust the screen brightness again.
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