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[Greg S <bugs-launchpad-net@xxxxxxxxxxxxx>]

I observe the same problem on 14.04 on HP EliteBook 840.

dmesg:

[    0.000000]  Linux version 3.13.0-36-generic (buildd@toyol) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #63-Ubuntu SMP Wed Sep 3 21:30:07 UTC 2014 (Ubuntu 3.13.0-36.63-generic 3.13.11.6)
[    0.000000] DMI: Hewlett-Packard HP EliteBook 840 G1/198F, BIOS L71 Ver. 01.06 01/24/2014

[19569.345195] [drm:intel_dp_aux_native_read] *ERROR* too many retries, giving up
 
lspci:

00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b) (prog-if 00 [VGA controller])
        Subsystem: Hewlett-Packard Company Device 198f
        Flags: bus master, fast devsel, latency 0, IRQ 63
        Memory at d0000000 (64-bit, non-prefetchable) [size=4M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at 3000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [a4] PCI Advanced Features
        Kernel driver in use: i915

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https://bugs.launchpad.net/bugs/1300914

Title:
  External screen undetected after first plug

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  On Ubuntu 14.04, the external screen plugged on VGA is detected and get activated correctly.
  However, if I unplug it and then replug it later, it is not detected anymore and the screen receives no signal.

  A way to get it back to work is to reboot or simply suspend the
  computer.

  Sorry but I have no idea of what package is handling that.

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