This is forked from  issue 822248 . See comment #3 for details. In summary:

We apply the resolution change only if the user closes the corresponding notification. So if the user makes two successive resolution changes of two different displays, each subsequent resolution change will revert (undo) the previous one (as long as the user doesn't dismiss the notification). This is confusing and unclear. Nothing in the UI indicates to the user that this is the behavior. We need to think of a better design like using a modal dialog or something like what other OSs do.