Running dell latitude E5450 with nVidea card and seeing this - both the error 
and sometimes when unlocking screen the monitor keeps flashing on and off every 
5 seconds until you change the resolution and change it back.
The best way to do this is CTRL+ALT+F6 then CTRL+ALT+F7

I am also seeing the issue where X is not showing the docked monitors
(eDP) as active if I:

suspend -> undock -> resume -> suspend dock -> resume

apport is reporting crashes frequently (using the non free Nvidea driver
so I assumed this was the issue).

The bit of information I can add is that apparently Windows users are
effected by the screen flashing also (in a company so everyone has the
same laptop)!

Dell released a BIOS update to fix the flashing, but it didn't help.
Just wanted to add this as it may be a firmware issue.

#uname -a
Linux 4.2.0-18-generic #22-Ubuntu SMP Fri Nov 6 18:25:50 UTC 2015 x86_64 x86_64 
x86_64 GNU/Linux

#lspci        
00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated 
Graphics (rev 09)
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09)
00:04.0 Signal processing controller: Intel Corporation Broadwell-U Camarillo 
Device (rev 09)
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller 
(rev 03)
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI 
Controller #1 (rev 03)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection (3) I218-LM 
(rev 03)
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio 
Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 
(rev e3)
00:1c.3 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #4 
(rev e3)
00:1c.4 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #5 
(rev e3)
00:1d.0 USB controller: Intel Corporation Wildcat Point-LP USB EHCI Controller 
(rev 03)
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
00:1f.2 RAID bus controller: Intel Corporation 82801 Mobile SATA Controller 
[RAID mode] (rev 03)
00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
01:00.0 SD Host controller: O2 Micro, Inc. SD/MMC Card Reader Controller (rev 
01)
02:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)
03:00.0 3D controller: NVIDIA Corporation GM108M [GeForce 840M] (rev a2)

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https://bugs.launchpad.net/bugs/1488719

Title:
  dmesg shows "[drm:gen8_irq_handler [i915]] *ERROR* The master control
  interrupt lied (SDE)!"

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