Default [Q]How to prevent black screen during calls

I'm running all stock on my Nexus 5 with 4.4.2. If I talk on the phone with it next to my ear the screen turns on and off as it should, so I know that the proximity sensor works. If I use the speaker phone and have the phone away from me, the screen goes black after a minute (which is what I have the screen timeout set to). The only way I can get it to wake up is to hit the power button. This is not a big deal except if I want the power button to end calls. Is there a way to wake the screen after it times out without using the power button? Or, is there a way to tell the phone not to shut off the screen during calls?

Thanks in advance.