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[Bug 1528735] Re: Suspend reboots every second time on Lenovo G50-45


Just updated to 4.2.0-27-generic #32~14.04.1-Ubuntu SMP, and this is
still an issue.

This may not actually be directly related to pm-suspend, but I put it
here for lack of a better proximate cause. This may need to be
transferred to be a kernel bug.

I suspect it may be related to  a reaction to

It can be reproduced by putting Ubuntu of just about any recent version
onto a Lenovo G50-45, and suspending it twice.

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  Suspend reboots every second time on Lenovo G50-45

Status in pm-utils package in Ubuntu:

Bug description:
  Fresh install of Xubuntu 14.04.3, replacing existing OEM Windows 10.
  Install detected UEFI, and installed in UEFI mode. (I have attempted
  to change to legacy boot, and got it to a state where it was booting
  without /sys/firmware/efi/ being present, but behaviour persisted.)

  Suspending the laptop, whether by closing the lid, choosing the
  suspend option from the menu, or directly typing "sudo pm-suspend"
  works perfectly well... once.

  The second attempt to suspend, whether immediately or hours later,
  suspends the laptop (I can see the screen turn off, and hear the disk
  and fans stop, but a moment later the screen shows bright yellow
  console text declaring "Warning!!! Boot script table modified!!!
  Please contact your vendor.", and then it hard reboots.

  This appears to be a weird interaction between suspend and UEFI
  protection, but others have reported that they have had working
  suspend when installed alone (and presumably in legacy from the
  start), but this behaviour appeared when reinstalled as dual-boot
  (when presumably UEFI would have had to be on).
  than-once-after-reboot-ubuntu-15-04-dual-boot/712232 and earlier
  please-contact-vendor, from different people.)

  Beyond the investigations I have done, I know next to nothing about
  UEFI, or how Suspend might be interacting with it. Much less why it
  appears to work perfectly exactly once.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: pm-utils 1.4.1-13ubuntu0.1
  ProcVersionSignature: Ubuntu 4.2.0-22.27~14.04.1-generic 4.2.6
  Uname: Linux 4.2.0-22-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Dec 23 13:27:11 2015
  InstallationDate: Installed on 2015-12-19 (3 days ago)
  InstallationMedia: Xubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: pm-utils
  UpgradeStatus: No upgrade log present (probably fresh install)

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