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ca616b902b
In order to report accurate values to users of the RandR property interface, it's sometimes necessary to ask the driver to update the value (for example when backlight brightness changes without the server's knowledge, due to hotkey events or direct sysfs banging). This patch wires up the core server code with a new xf86CrtcFuncs callback, get_property, to allow for this. The new code is available under the RANDR_13_INTERFACE define, which in turn depends on the RANDR_12_INTERFACE code.