Public bug reported:
With Dell E7440 with Intel graphics, attached to dock and also two
external displays connected to the dock:
when I boot the machine, the built-in display and the external displays
are enabled in login screen. However, the external displays are disabled
when I log in.
All displays remain enabled after login with 4.4.0-72.93. I never
installed 4.4.0-73.94 or 4.4.0-74.95 but I can see in the changelog that
there were i915 changes in 4.4.0-73.94.
The external displays are shown and are marked enabled in KDE's System
Settings / Display and Monitor / Display Configuration. If I first mark
them disabled (and apply the configuration) and then mark them enabled
(and apply the configuration), they are actually enabled.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-75-generic 4.4.0-75.96
ProcVersionSignature: Ubuntu 4.4.0-75.96-generic 4.4.59
Uname: Linux 4.4.0-75-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: hannuko 2338 F.... pulseaudio
/dev/snd/controlC0: hannuko 2338 F.... pulseaudio
CurrentDesktop: KDE
Date: Thu Apr 27 19:39:12 2017
HibernationDevice: RESUME=UUID=43dbb372-1944-40d4-b1ea-94193bf0bbb2
InstallationDate: Installed on 2015-12-21 (493 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Dell Inc. Latitude E7440
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-75-generic
root=/dev/mapper/kubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.4.0-75-generic N/A
linux-backports-modules-4.4.0-75-generic N/A
linux-firmware 1.157.8
SourcePackage: linux
UpgradeStatus: Upgraded to xenial on 2016-12-30 (117 days ago)
dmi.bios.date: 02/02/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A14
dmi.board.name: 07F3F4
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA14:bd02/02/2015:svnDellInc.:pnLatitudeE7440:pvr01:rvnDellInc.:rn07F3F4:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E7440
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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https://bugs.launchpad.net/bugs/1686788
Title:
External displays disabled after login - regression in 4.4.0-72.93 ->
4.4.0-75.96 update
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