All, I've been hitting my head against the wall on this one but I really cannot find a solution. I'm pretty sure its a apple bug (i've filed a bug report) but I'm actually looking for a workaround if possible. The problem is described as follows: Summary: Using the HID Manager API, some hardware devices have a zero-valued input callback. (the callback does happen but the value is ALWAYS zero) Steps to Reproduce: Download any HID manager test suite from: http://developer.apple.com/library/mac/#samplecode/HID_Explorer/Introduction... or http://ddribin.googlecode.com/svn/trunk/DDHidLib/ Try to test the above code using a Apple Magic Trackpad. Expected Results: Apple magic trackpad should issue GD_X and GD_Y events with non zero values like the apple magic mouse, corded USB Apple mouse or any other mouse Actual Results: HID Manager input callbacks DO happen but always have a zero value Regression: None. This does not work since Snow Leopard (10.6) Notes: Some users of my application (which uses HID Manager) have also complained that a Macbook Air connected through a thunderbolt display exhibits the same behavior when using USB corded mice attached to the TB display. Thanks. I would also like to add that the SeizeDevice parameter: IOReturn ret = IOHIDManagerOpen(hidman, kIOHIDOptionsTypeSeizeDevice); Is able to grant me exclusive access of ALL mice (Apple USB Mouse, Bluetooth mouse, Logitech USB mouse) but is unable to grant exclusive access on the trackpad ( the above command would return with zero result but the OS still gets trackpad events) To add to this: unloading the com.apple.driver.AppleBluetoothMultitouch kext and removing it from /System/Library/Extensions so that it doesnt load at all fixes the problem as the OS loads the default safe mode driver. So its obviously this driver thats causing the issue. Thanks -- Faraz Khan _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app... This email sent to site_archiver@lists.apple.com