This is darkroom mode. In the future, alt+End will get f.lux to disable whatever it's doing.

@herf Ok I will try again soon with the newest version I can find on this site. And yes, looks like cnmss is unrelated. Apologies. (http://www.techsupportforum.com/forums/f10/does-anyone-know-what-cnmss-is-resolved-154635.html) I will update after I reinstall the new version of the app. Thank you.

@shantanubdas311 said in F.lux auto disables when playing full screen games?: @TwoCables OK. I'm sorry, I really didn't mean it. I'm sorry too, but I had to be sure it was clear how it came across to me. But rest assured, it's all good and we're alright.

@Amun-Ra I've got one more idea, what light source are you using in the room your monitor is in? If it's any type of fluorescent I suggest you find either a cool white LED (and get one that is high quality, I can help) or go the opposite route and get a warm white led bulb. For $5 the IKEA Ledare is the best option beating way too many $10 bulbs.

Same here on Z1 Compact 5.1.1 Lollipop. If I wait long enough and mess around with locking/unlocking the phone, the black screen goes away and I can use my phone again. Other than that (and the known issue when f.lux gets disabled for a second when an app is installing/updating) it's been working great!