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
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