[Bug 1192051] Re: plymouthd spinning at 100% CPU after I log in

[Daniel van Vugt]

Oops, I forgot to post my original findings here. You might find them
helpful...

plymouthd is spinning on an fd of "/dev/tty7" with errno==EIO. Waiting
for the "plymouth deactivate" to properly complete (hence
drmDropMaster), avoids the bug.

So it looks like plymouth's DRM code is not very clever with its error
handling. Once it starts getting EIO it should probably give up.
Instead, it doesn't understand EIO and retries constantly.

Also, enhancing plymouth so that "plymouth --wait" works with the
deactivate command would have been very helpful. Right now, plymouth
--wait does not wait for the deactivate to complete.

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https://bugs.launchpad.net/bugs/1192051

Title:
  plymouthd spinning at 100% CPU after I log in

Status in Light Display Manager:
  Fix Released
Status in “plymouth” package in Ubuntu:
  Confirmed

Bug description:
  plymouthd spinning at 100% CPU. Probably triggered by use of this PPA:
  https://launchpad.net/~mir-team/+archive/system-compositor-testing
  although that does not change Plymouth.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: plymouth 0.8.8-0ubuntu7
  ProcVersionSignature: Ubuntu 3.9.0-6.13-generic 3.9.6
  Uname: Linux 3.9.0-6-generic x86_64
  ApportVersion: 2.10.2-0ubuntu1
  Architecture: amd64
  Date: Tue Jun 18 15:06:38 2013
  DefaultPlymouth: /lib/plymouth/themes/ubuntu-logo/ubuntu-logo.plymouth
  ExecutablePath: /sbin/plymouthd
  InstallationDate: Installed on 2013-06-11 (6 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130611)
  MachineType: LENOVO 4286CTO
  MarkForUpload: True
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.9.0-6-generic root=UUID=25c27832-0efa-4fc4-8a14-41af68d008dc ro quiet splash vt.handoff=7
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
  ProcFB:
   0 inteldrmfb
   1 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.9.0-6-generic root=UUID=25c27832-0efa-4fc4-8a14-41af68d008dc ro quiet splash 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: 04/11/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET68WW (1.38 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4286CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8DET68WW(1.38):bd04/11/2013:svnLENOVO:pn4286CTO:pvrThinkPadX220:rvnLENOVO:rn4286CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4286CTO
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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