I did some testing with kernels < 4.7:
Freezes:
4.4.0-32 from xenial-proposed
4.5.7 from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.5.7-yakkety/
Works:
4.6.4 from http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6.4/
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Still freezes when using DisplayPort on kernel 4.4.0-24. Tested with
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7-rc3-yakkety/ and DP
works fine - however, display is not recognized when using VGA.
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Packages, which is
Hmm, looks like it's not completely fixed on 4.4.0-23 after all. HP
EliteBook 840 G3 has DisplayPort and VGA connectors. With VGA connector
everything works fine but with DP I get a freeze when disconnecting the
cable and sometimes when changing mode between mirror, extended, 1
display
Kernel 4.4.0-23 from xenial-proposed fixed freezes when plugging in an
external display on HP EliteBook 840 G3.
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https://bugs.launchpad.net/bugs/1559308
Title:
Plugging
Still happens with kernel 4.4.0-18 from xenial-proposed
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https://bugs.launchpad.net/bugs/1566465
Title:
[regression]: Failed to call clock_adjtime(): Invalid argument
Here's another report with HP EliteBook 840.
== dmesg ==
DMI: Hewlett-Packard HP EliteBook 840 G1/198F, BIOS L71 Ver. 01.04 10/09/2013
== /proc/cpuinfo ==
model name : Intel(R) Core(TM) i5-4300U CPU @ 1.90GHz
== lspci ==
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT
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