if you go to the setting for screen settings and you set it on screens never turn off, then I have news for you under deepin 15.8 this does not work anymore, because all settings are always on and they turn off so that does not work I find it very annoying.
this is the first time I see this in deepin.

the other thing that i seen is in this version if you run dualscreens or triplescreen the system is very annoying this time and at some point it wil frees your computer , there is a bug in there two .. its very difficult to handle the screens this time in this version very strange ,i have never seen this crap before...
nvidia or not it dont matter its all the same..