Same problem here with a Dell Latitude E5440:
00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b)
Subsystem: Dell Haswell-ULT DRAM Controller
Flags: bus master, fast devsel, latency 0
Capabilities: [e0] Vendor Specific Information: Len=0c <?>
Kernel driver in use: hsw_uncore
The external monitor is sometimes not found after wake up from suspend.
It seems this happens if I have used the laptop without monitor before
suspend.
The external monitor is not recognized on DisplayPort nor at VGA
connector.
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https://bugs.launchpad.net/bugs/1552040
Title:
Laptop sometimes doesn't detect external monitor
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