From: Apple Product Security
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APPLE-SA-2016-01-19-2 OS X El Capitan 10.11.3 and Security Update 2016-001 OS X El Capitan 10.11.3 and Security Update 2016-001 is now available and addresses the following: AppleGraphicsPowerManagement Available for: OS X El Capitan v10.11 to v10.11. [...]