17.10: Intel UHD 630 (8700k) unable to boot

Question

I have a pc equipped with an intel 8700k cpu and an nvidia 1070

When my monitor is connected to the 1070, everything is fine

When my monitor is connected to the iGPU (intel UHD 630), it is unable to finish booting. It starts printing the startup info in the terminal, but stops here:

Started Session 1 of user MyUser
Started User Manager for UID 1000
Created slice User Slice of gdm
Starting User manager for UID 121
Started session c1 of user gdm
Started user manager for UID 121
Stopping User manager for UID 121
Stopped User manager for UID 121
Removed slice User Slice of gdm
Created slice User slice of gdm
...
Started session c2 of user gdm
Started session c3 of user gdm
...
Starting Update UTMP about system runlevel changes
Started update UTMP about system runlevel changes.erface

Gdm/X never starts. I can switch tty, but am unable to start x

I tried updating the kernel to 4.14.1 but this gives me the same result

When i boot using the nvidia card instead and go to "additional drivers" i can see both the 1070 and the iGPU (iGPU using proprietery intel-microcode) but the device is listed as "UNKNOWN"

How do i get X to output on my iGPU?

Edit: From Xorg.log:

LoadKernelModule: Setting of real/effective user Id to 0/0 failed (WW) LoadKernelModule: Setting of real/effective user Id to 0/0 failed intel: waited 202 ms for i915.ko driver to load
LoadKernelModule: Setting of real/effective user Id to 0/0 failed (EE) No devices detected

Answer 1

Ok so the problem was resolved by

sudo update-pciids

After that you have 2 options:

1. Upgrade to kernel 4.14.1

OR

2. Add "i915.alpha_support=1" to "GRUB_CMDLINE_LINUX_DEFAULT" in /etc/default/grub

Updating pciids appears to be essential for both options