dm-crypt password prompt visible on one screen only

[Martin Vysny]

Thank you for your wonderful work on Ubuntu. I recently upgraded to 14.10 and I'm enjoying it.

In Ubuntu 14.04, the prompt was visible on all attached screens, including the laptop display. After upgrading to 14.10, the password prompt is only visible on the external screen, making it hard to enter the password when the notebook is hooked to for example a TV. Also, the primary screen being black and TV turned off, my wife thought that the notebook was frozen and malfunctional.
Thanks!

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: plymouth 0.9.0-0ubuntu6
ProcVersionSignature: Ubuntu 3.16.0-23.30-generic 3.16.4
Uname: Linux 3.16.0-23-generic i686
ApportVersion: 2.14.7-0ubuntu7
Architecture: i386
CurrentDesktop: Unity
Date: Sat Oct 18 14:22:42 2014
DefaultPlymouth: /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
InstallationDate: Installed on 2013-08-17 (426 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
MachineType: Acer TravelMate B113
ProcCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-23-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-23-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
SourcePackage: plymouth
TextPlymouth: /lib/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
UpgradeStatus: Upgraded to utopic on 2014-10-13 (4 days ago)
dmi.bios.date: 07/19/2012
dmi.bios.vendor: Acer
dmi.bios.version: V1.05
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: BA10_HX
dmi.board.vendor: Acer
dmi.board.version: Type2 - Board Version
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.05
dmi.modalias: dmi:bvnAcer:bvrV1.05:bd07/19/2012:svnAcer:pnTravelMateB113:pvrV1.05:rvnAcer:rnBA10_HX:rvrType2-BoardVersion:cvnAcer:ct10:cvrV1.05:
dmi.product.name: TravelMate B113
dmi.product.version: V1.05
dmi.sys.vendor: Acer

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.