Created attachment 1110493 [details]
journalctl -ab after boot + a couple of screen flashes, with gdm debugging enabled

Description of problem:

With Wayland enabled, I don't get to see the login screen.  It flickers between black and "no signal".  Disabling Wayland fixes this.

(Step-by-step instructions to disable Wayland here: https://www.maketecheasier.com/fix-wayland-gdm-issue-fedora/).

This is an Intel NUC 5CPYH system - "Braswell" SoC.

I assume it's unlikely to be a problem in Wayland specifically.  But hopefully  someone will triage / help me identify the component it should be filed against.

[It would also be nice if "disable Wayland" was listed somewhere as a troubleshooting option; I didn't see that anywhere.  Any suggestions who to talk to?  Maybe the install guide is a good starting point as it has a very minimal troubleshooting section]


Version-Release number of selected component (if applicable):

kernel 4.2.8-300.fc23.x86_64 (also on 4.2.3-300)
wayland 1.9.0-1.fc23
mesa 11.1.0-20151218.fc23
mesa-libGLU 9.0.0-9.fc23

gnome-session-wayland-session-3.18.1.2-2.fc23
gdm 3.18.2-1.fc23


How reproducible: always, just turn the box on and wait for gdm to start.

Steps to Reproduce:
1. Buy NUC5CPYH
2. Install Fedora Workstation 23
3. Boot


Actual results:

I don't get to see the login screen.  It flickers between black and "no signal".  Disabling Wayland fixes this.


Expected results:

Lovely free software GUI appears when booting my Fedora install.


Additional info:

Even with the workaround I get a few kernel messages "*ERROR* timed out waiting for Punit DDR DVFS request"