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In theory that's right, but how much are we talking here...0.1% over 24 hours? It takes VERY little CPU to process a change in brightness and I prefer having my phone adjust the brightness down a bit in low light to save battery as well as up a bit in bright light, which I'm confident in the long run more than offsets the CPU usage to monitor the ambient light sensor.leaving brightness to auto actually uses more battery life as it has to use cpu to detect and change the brightness accordingly

Auto seemed a little too dim - I bumped it up a little and it looks much better to me - doesn't seem to hurt battery life - I'm at 60% after 14 hours.