White line in middle of screen on macbook air

When I am on a screen sometimes my macbook air shows a white line. on the right it is brighter and on the left it is dimmer. I have seen it on the startup screen, and on youtube videos.

This from the Adobe bug tracking system:
http://bugs.adobe.com/jira/browse/FP-4527
Qingyan zhu added a comment - 05/17/10 12:53 AM
Thanks for your report for flash player.  Seems this is feature of ATI. refer to http://www.neoseeker.com/Articles/Hardware/Features/ati_9.11/2.html  
Please disable Avivo demo mode and test it again.
Worth commenting on the defect...

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