[Bug 198937] Xorg blank screen after r277486 on Asus Zenbook

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198937

            Bug ID: 198937
           Summary: Xorg blank screen after r277486 on Asus Zenbook
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: sparvu at kronometrix.org

Im currently running 11.0-CURRENT #0 r277486 on Asus Zenbook laptop.

I have discovered Im not able to update to any new snapshots after
r277486. Xorg refuses to work, Im getting a blank screen with no possibility to
have a functional vt restoration. I always need to reboot. The kernel is up
I can use the keyboard so the only trouble seems to come from Xorg / vt.

I have tried updating my laptop to: r278452, r278908, r279514, r279813.
No luck.  If I go back to use r277486 then my Xorg and vt start functioning 
correctly. Im using the i915 driver for Xorg and my config is in [1]. 

Any ideas what is this about ? Were any changes after r277486 regarding 
i915 or Xorg ? I tried to create a new xorg.conf, reuse the old one whatever.
No luck.


Zenbook UX32VD Configuration

CPU: Intel(R) Core(TM) i7-3517U CPU @ 1.90GHz
Memory: 6 GB RAM
Storage: SanDisk SSD i100 24GB, Samsung SSD 840 PRO 500GB
Video: Intel HD Graphics 4000, Nvidia GT620M
Display: 13" IPS Full HD anti-glare
Wifi: Intel Centrino Advanced-N 6235
3 x USB 3.0 port(s) 
1 x HDMI 
1 x Mini VGA Port 
1 x SD card reader

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