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First, you ran inxi as root for no reason, so you can't see the full output.
As far as I know, the Broadwell iGPU you have does not require firmware-misc-nonfree. What kernel are you running? (uname -r) Did you see this problem before installing the Nvidia drivers? Inxi also says you're using the kernel's modesetting driver instead of the "intel" one provided by xserver-xorg-video-intel, if that makes any difference. But I have heard the intel driver is unstable on Broadwell chipsets.