On Mar 29, 2011, at 3:16 PM, Jason Harris wrote: > Hi All, > > Some users are complaining that my application (MacHg) is causing their > MacBooks to switch from using the integrated Intel (lower power) card to the > NVIDIA (higher power) graphics card. > > Eg some related articles I dug up: > http://appletoolbox.com/2010/05/macbook-pro-mid-2010-graphics-switching-which-apps-trigger-how-to-monitor/ > http://www.cocoabuilder.com/archive/cocoa/293116-i5-i7-auto-graphics-switching.html > http://support.apple.com/kb/HT3207 > > However, my application doesn't appear on the surface to make heavy use of > graphics. (It does make heavy use of GCD though). Is there a general cause > for this switching of the graphics card?.
There are a few of them I know about: 1. Your application starts CoreAnimation by calling -setWantsLayer: on a view with a layer, or adding a layer in IB 2. Your application initializes an NSOpenGLView using a pixel format that works best using the discrete GPU 3. Your application initializes a QTCaptureView, QTMovieView, or QCView 4. The user plugged in an external display (external displays must use the discrete GPU) There might be more, but those are the ones I know about. > How can I find out when such a switch occurs in my code and for what reasons? > If you have a dual-GPU Mac, then try breaking on IOServiceOpen and look at the stack trace when it breaks. If you don't, then you can't. Nick Zitzmann <http://www.chronosnet.com/> _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
