Public bug reported:
This seems similar to 1496697 but i can't seem to work around the issue
by booting without the cable plugged in. Ubuntu stopped recognizing my
HDMI connected monitor after a regular system update reboot.
lsb_release -rd
Description: Ubuntu 14.04.3 LTS
Release: 14.04
xrandr
Screen 0: minimum 8 x 8, current 1366 x 768, maximum 32767 x 32767
eDP1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis)
309mm x 173mm
1366x768 60.0*+
1360x768 59.8 60.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.16.0-51-generic 3.16.0-51.69~14.04.1
ProcVersionSignature: Ubuntu 3.16.0-51.69~14.04.1-generic 3.16.7-ckt17
Uname: Linux 3.16.0-51-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.18
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Oct 28 20:26:35 2015
InstallationDate: Installed on 2015-04-16 (195 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: linux-lts-utopic
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-lts-utopic (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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https://bugs.launchpad.net/bugs/1511163
Title:
HDMI output no longer works after running updates
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