I have Public Beta 1 on my Late 2010 11" MBA. AmbientDisplayAgent uses a lot CPU. Sometimes it idles at around 1%, but most of the time it uses 20-30% and up to 100% CPU time (out of 200% available). As far as I know this process has something do with the ambient light sensor, but my Mac doesn't have one. Anyone else have this issue? Any solutions or just wait until the next beta? Killing the process gets rid of it for a while, but after a while it comes back.