[Bug 1043755] Re: Plymouth screen hangs on shutdown

[Steve Langasek]

Ok, it sounds like plymouth is working as expected when called as
'plymouthd --mode=shutdown'.  So I think the fixed splash screen that
you see on shutdown is *not* due to plymouth.  It may be a bug in the
video driver, or it may be something that lightdm is doing on shutdown,
I'm not sure.  Reassigning to lightdm for further triaging.

> But, just for the sake of another opinion, do you think holding down the power
> button damages my setup (If your response is that it damages the Hard Disk,
> what if the Hard Drive LED is not active?)

An unclean shutdown of the system, whether due to a hang or a power-off,
can cause corruption and data loss on your filesystem.  It will not
damage the hard disk itself, but you can lose data.  Usually the risk of
data loss is very small.

To further reduce your risk, when this hang happens you can try to use
the SysRq key (Alt+PrtScn):  SysRq+S to sync the disk, SysRq+U to
remount read-only, and SysRq+B to reboot.  If this sequence *doesn't*
let you reboot, then that further tells us that the kernel has crashed,
pointing the finger strongly at the video driver.

** Package changed: plymouth (Ubuntu) => lightdm (Ubuntu)

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https://bugs.launchpad.net/bugs/1043755

Title:
  Plymouth screen hangs on shutdown

Status in “lightdm” package in Ubuntu:
  New

Bug description:
  Ocasionally, when I shut down, I am sent to the plymouth splash screen as usual, however the ubuntu logo and the progress dots are static - they are not moving. This has been happening more recently over the past week.
  The hard drive LED on my case is not lit up at all when this happens.

  Attatched:
  Xorg.log
  Syslog.log

  Motherboard ASUS M5A78L -M LX V2
  GPU Sapphire Radeon HD 6570 WITH UBUNTU-PACKAGED FGLRX INSTALLED DRIVER
  CPU AMD Athlon II X2 255 3.2GHz
  HD WD Caviar 500GB
  Monitor Benq G2255

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: plymouth 0.8.2-2ubuntu30
  ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
  Uname: Linux 3.2.0-29-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.0.1-0ubuntu12
  Architecture: amd64
  Date: Thu Aug 30 11:42:47 2012
  DefaultPlymouth: /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  MachineType: System manufacturer System Product Name
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-29-generic root=UUID=e97b3482-c14c-4320-b621-19dbc962822b ro
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-29-generic root=UUID=e97b3482-c14c-4320-b621-19dbc962822b ro
  SourcePackage: plymouth
  TextPlymouth: /lib/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/26/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0902
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M5A78L-M LX V2
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0902:bd03/26/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM5A78L-MLXV2:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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