[Bug 1503716] Re: Display corruption during boot process

[Chris Roberts]

Output from lshw attached.

** Attachment added: "lshw"
   https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1503716/+attachment/4487397/+files/thinkpad-lshw.txt

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Title:
  Display corruption during boot process

Status in plymouth package in Ubuntu:
  New

Bug description:
  ThinkPad X1 Carbon Gen3.

  With the 3.19.0-25 kernel included in the 14.04-3 ISO download all
  works perfectly.

  The first software updates include 3.19.0-30 kernel which exhibits the
  issue:

  Display pauses at Drive Encryption password, but you cannot see
  anything beyond a white screen with uneven black vertical lines.
  Typing the drive encryption password seems to affect this corrupted
  screen and then hitting enter results in the the boot process
  continuing.

  Once it reaches lightdm all is well.

  Installing mainline kernel 3.19.8-031908ckt7 still suffers from
  display corruption - block characters instead of text for example -
  but a new Drive Encryption password prompt appears which works fine.

  Uncertain if this is an i915 bug or a plymouth bug or both. I note
  that there were a number of i915 changes between 3.19.0-25 and
  3.19.0-30.

  See screen photograph attachment.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: plymouth 0.8.8-0ubuntu17.1
  ProcVersionSignature: Ubuntu 3.19.0-30.34~14.04.1-generic 3.19.8-ckt6
  Uname: Linux 3.19.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.15
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Oct  7 15:33:07 2015
  DefaultPlymouth: /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
  InstallationDate: Installed on 2015-10-05 (2 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  MachineType: LENOVO 20BS006EUK
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-30-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash elevator=noop vt.handoff=7
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-30-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash elevator=noop vt.handoff=7
  SourcePackage: plymouth
  TextPlymouth: /lib/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/12/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N14ET28W (1.06 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BS006EUK
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN14ET28W(1.06):bd03/12/2015:svnLENOVO:pn20BS006EUK:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BS006EUK:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BS006EUK
  dmi.product.version: ThinkPad X1 Carbon 3rd
  dmi.sys.vendor: LENOVO

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