U3415W, wake issue, obscures log in prompt?

Every time my Dell U3415W monitor wakes from sleep, it shows a popup window that tells me my Input source. This popup appears over the top of the Windows login prompt. I've searched the menu options and the manual for a way to disable this and cannot find a method to re-mediated this. Needless to say this is annoying. Not only is this useless information (as my input type does not change), but it also makes the process of logging into my computer, every single time, more difficult.