How does Arch know when to switch between graphics cards?

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https://bbs.archlinux.org – Apologies, I meant:Without any additional software/packages, what is the default behavior used by Arch? As I understand, the IGP is always on, whereas the DGP is only switched on when higher processing performance is required.Does this mean Arch renders, by default, everything to the IGP? ljwagerfield https://bbs.archlinux.org/profile.php?id=73649 2013-08-26T10:38:23Z (HowTos)