2012-model Macbook Air got Mavericks installed but boot up with 1-second brighter screen before logging into my account, is this a bug?

as above, never got this issue when i was using 10.8.
now every time when i boot my macbook air, just before logging into my user account, the screen blinks once(screen gets brighter a lot in a very short time about 1 second).
i've googled around, found there are some fellows who also have the same issue as mine.
Is this a bug with 10.9 mac os? will Apple fix it???

Mine is doing the same thing but it has happened to me before on other versions too.
I tried resetting PRAM and it didn't help.
Also running real laggy on bootup even thou I repaired permissions.
I think a patch from Apple fixed my screen before or it was just plain luck because it was working right before this UPGRADE.
I will be trying a clean install tonight or this weekened for sure to try and fix my issues.

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