"Warning: Battery save mode is on"

[melancholicman]

Hello,
I've got a problem with PPSSPP what I didn't notice one year ago, when I've used it last time. When I launch any game, I'm getting a warning about battery save mode and I guess games are a little lagging. The problem is that it's switched off and I don't know how to solve that. After some operations on my smartphone I've decided to hardreset it. Unfortunetly that didn't help with the problem. Warning is still on the screen.
Later I've asked a friend who also(like me) have Samsung Note 4 and Android 6.0 to check if he has the same problem. He has confirmed it.

So what's the problem? Can note 4 users count on PPSSPP developers to fix that?