Since the last day or so my screen no longer comes out of 'dim' mode. It dims automatically as normal: when the lock screen comes on, and when the display is about to time out. In both situations my current brightness level would be immediately restored in response to input, but this no longer happens. Now I must manually set the brightness after every unlock or near timeout. So annoying! Anyone else had this? I've looked through all the settings, disabled locale and switched scenes with no joy. Also restarted the phone.