Public bug reported:
I'm experiencing an issue after upgrading from Xubuntu 15.10 to 16.04. I'm
using a Dell Latitude E7450, attached to a docking station, and connected to
two Dell U2715H via mDP, both displaying 2560x1440.
Each of the displays intermittently turns off for about 2 or 3 seconds, and
then turns back on again. I couldn't tell whether this behaviour is
specifically triggered by anything - it seems to happen randomly. There is no
notification from the screen's OSD when it goes black.
The issue does not occur when the system is booted with the previously
installed kernel, 4.2.0-35-generic.
Please let me know if you need any further information.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-21-generic 4.4.0-21.37
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: dkozar 1793 F.... pulseaudio
/dev/snd/controlC0: dkozar 1793 F.... pulseaudio
CurrentDesktop: XFCE
Date: Fri Apr 29 11:57:51 2016
InstallationDate: Installed on 2015-10-28 (184 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Dell Inc. Latitude E7450
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic.efi.signed
root=UUID=4dc74fbd-1097-4419-a15f-7dbac52da6e0 ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.4.0-21-generic N/A
linux-backports-modules-4.4.0-21-generic N/A
linux-firmware 1.157
SourcePackage: linux
UpgradeStatus: Upgraded to xenial on 2016-04-29 (0 days ago)
dmi.bios.date: 09/01/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0Y15C1
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA07:bd09/01/2015:svnDellInc.:pnLatitudeE7450:pvr:rvnDellInc.:rn0Y15C1:rvr:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E7450
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/1576616
Title:
Monitor intermittently turns off and back on again
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