i915 and Intel NUC DN2820FYK

[Aristeu Rozanski]

(please keep me on Cc, I'm not subscribed to the list)

Hello,
while trying to use the NUC DN2820FYK [1], screen goes black as soon
i915 is loaded. The NUC is connected by HDMI to a 1920x1080 display.
Works normally while on the BIOS (upgraded to the latest one just in
case today) and while on grub. Here's what I tried:

- nomodeset: partially works, text mode keeps flickering and X has lines
  out of place
- enable_rc6={0,2,3}, no result
- drm_kms_helper.edid_firmware=edid/1920x1080.bin (no
  /usr/lib/firmware/edid in this box  but from what I found this
  specific one is supposed to be built in)

Tested with kernel: 0b7962a6c4a37ef3cbb25d976af7b9ec4ce8ad01 (top of
Linus' today)

My best guess on messages [2]:
[    2.135440] [drm:drm_sysfs_connector_add] adding "HDMI-A-1" to sysfs
[    2.135443] [drm:drm_sysfs_hotplug_event] generating hotplug event
[    2.135522] [drm:drm_sysfs_connector_add] adding "DP-1" to sysfs
[    2.135525] [drm:drm_sysfs_hotplug_event] generating hotplug event
[    2.137048] [drm:drm_calc_timestamping_constants] crtc 26: hwmode: htotal 800, vtotal 525, vdisplay 480
[    2.137053] [drm:drm_calc_timestamping_constants] crtc 26: clock 25185 kHz framedur 16676593 linedur 31764
[    2.138876] [drm:gen6_ppgtt_init] Adding PPGTT at offset 7fdf0000
[    2.245160] i915 0000:00:02.0: No connectors reported connected with modes
[    2.245177] [drm] Cannot find any crtc or sizes - going 1024x768

On /sys/class/drm/*/status, in both cases are 'disconnected'.

I also captured the lspci [3].

Anything I could try or perhaps any other information I can gather?
Thanks

[1] http://www.intel.com/content/www/us/en/support/boards-and-kits/intel-nuc-kits/intel-nuc-kit-dn2820fykh.html
[2] https://paste.fedoraproject.org/382250/47405146/
[3] https://paste.fedoraproject.org/382253/14664476/

-- 
Aristeu