The screen turns off after booting Ubuntu.
Pressing escape once turns the screen back on and shows a command link LUKS password prompt.
Pressing escape again shows the graphical boot screen without any issues.
May be a duplicate of bug #1030094
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: plymouth 0.8.4-0ubuntu3
ProcVersionSignature: Ubuntu 3.5.0-11.11-generic 3.5.2
Uname: Linux 3.5.0-11-generic x86_64
ApportVersion: 2.5.1-0ubuntu2
Architecture: amd64
CurrentDmesg: dmesg: klogctl failed: Operation not permitted
Date: Mon Aug 27 15:00:02 2012
DefaultPlymouth: /lib/plymouth/themes/kubuntu-logo/kubuntu-logo.plymouth
MachineType: System manufacturer P5QL PRO
ProcCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-11-generic root=/dev/mapper/root ro quiet splash radeon.pcie_gen2=1 libahci.ignore_sss=1 raid=noautodetect plymouth:debug vt.handoff=7
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.5.0-11-generic root=/dev/mapper/root ro quiet splash radeon.pcie_gen2=1 libahci.ignore_sss=1 raid=noautodetect plymouth:debug vt.handoff=7
SourcePackage: plymouth
TextPlymouth: /lib/plymouth/themes/kubuntu-text/kubuntu-text.plymouth
UpgradeStatus: Upgraded to quantal on 2012-08-23 (3 days ago)
dmi.bios.date: 08/26/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0601
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: P5QL PRO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0601:bd08/26/2008:svnSystemmanufacturer:pnP5QLPRO:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5QLPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: P5QL PRO
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
Status changed to 'Confirmed' because the bug affects multiple users.