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macosqmlqt5
Tim
Tim

Reputation: 4823

QML causing switch to discrete graphics

Using Qt 5.1 on OSX Mountain Lion, I'm noticing that my app is causing the computer to switch from built-in energy efficient graphics to the more power hungry discrete card.

Is there any way to prevent this from happening?

Upvotes: 4

Views: 534

Answers (1)

MTuner
MTuner

Reputation: 437

Since Qt 5.3 it is possible by using special key in Info.plist for your Qt application.

1) To use custom Info.plist, set QMAKE_INFO_PLIST variable in *.pro file.

# qmake will copy this file to MyApp.app/Contents/Info.plist
QMAKE_INFO_PLIST = MyInfo.plist

By default, qmake generates generic Info.plist file, so you can use it as a template. You can also see the example here.

2) Then add the next key to the "dict" section of your Info.plist:

<dict>
    ... other keys here ...
    <key>NSSupportsAutomaticGraphicsSwitching</key>
    <true/>
</dict>

This key should work since Qt 5.3 (see this commit).

3) Make sure Qt will place your custom Info.plist file to the MyApp.app/Contents/Info.plist.

For some reason, Qt Creator won't update the Info.plist in the *.app file if it already exists. Thus, after the modifying Info.plist remove the *.app file from the build directory and rebuild the project to apply the changes.

Upvotes: 2

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