This is a big improvement on the current F23 kernel on Thinkpad P70 machines (Intel HD Graphics 530 + Nvidia M600M). However, there is a problem coming out of sleep when only the Nvidia GPU is in use ("Discrete Graphics" in the BIOS). In that case, the screen stays black until X11 is restarted.

I tested this kernel with (https://cgit.freedesktop.org/~airlied/linux/commit/?h=drm-fixes&id=95664e66fad964c3dd7945d6edfb1d0931844664) and that helped, a lot, but didn't solve the problem entirely. With that patch, after sleep, the screen stays dark but pressing ctrl + alt + f3 -> f1 (a few times) eventually recovers the screen. This wasn't possible before the patch.

I don't this it relates, but when first booting (when the tux icons show how many cores there are after grub exits), there is still an unprinted bar along the bottom of the screen. Once the resolution changed though (while still displaying the boot text), the bar goes away and the screen renders fine.