Comment 48 for bug 1533221

I have the same problem, my hardware is a Clevo P640RE with intel i7-6700HQ and a nvidia GTX970M.

With 15.10 i got it working (a little bit) with i915.preliminary_hw_support=1 and nomodeset, but the system always froze after some seconds, except if starting in recovery mode. I tried different nvidia-drivers but that did not change anything.

So i tried 16.04 alpha but i had the same issues with kernel 4.3 as with 4.2, only recovery mode was working. After compiling & installing the latest 4.4.0.1.15 kernel (4.3 config and default to all questions) and with the newest nvidia-361 i can still not use the nvidia-card (the login problem mentioned above) but at least it starts with the intel gpu if i boot in recovery mode.

Also i cannot change the brightness using the intel gpu.

At some point after installing/uninstalling nvidia-drivers i got a working nvidia-config for a moment and i was able to change brightness, but that did only last until the next reboot and everything was broken again.

If i start with 4.4.0.1.15 without recovery mode, it switches to a blank black screen after grub, cpu seems to go to 100% and freezes. nomodeset has no effect.