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Ubuntu 12.04 Turn Off Discrete Graphic Card on Boot

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linux-howto

http://ubuntuguide.net – This simple tutorial will explain how to turn off discrete card on a Ubuntu laptop with two graphic cards. Discrete graphic card takes up more energy and the processor usage. If you seldom use the discrete card, follow the steps to turn it off. 1. On Ubuntu, hit Ctrl+Alt+T to launch a terminal window. Copy and paste this command in terminal, and hit enter to switch to hybrid graphics: echo IGD > /sys/kernel/debug/vgaswitcheroo/switch 2. Then execute this command to temporarily turn off discrete card: echo OFF > /sys/kernel/debug/vgaswitcheroo/switch If the indicator lamp runout, follow step 3 (HowTos)