Comment 10 for bug 1671799

Same thing with a lenovo IdeaPad Y580 (sandybridge) except there it doesn't even make it the low graphic pop up.

In both cases (sandybridge & previous laptop which is haswell) if I install the nvidia drivers & reboot, it does boot up to an ubuntu session. From there switching via prime profiles to intel gpu works & survives a reboot.
So the issue is on an upgrade of xserver while on the Intel iGPU, maybe how alternatives are set?

Also to report that when the nvidia drivers are used via nvidia-prime the current lack of any vsync is Not solved at all.. ( logs look good for prime synchronization, just doesn't work.