I also upgraded several times since my report on 2016-02-24. I am convinced the
bug is a combination of
1) BIOS version (possible due to security fix of Vulnerability Note VU#976132
mentioned above)
2) Linux kernel in general (regardless of kernel version or distribution)
3) boot in UEFI mode
Tests of various combinations of BIOS, distribution and kernel
underneath. "Cannot suspend" means can suspend once, but freezes on
second suspend and after hard restart prints "Warning!!! Boot script
table modified" boot message and freezes.
Lenovo S435, all boots in UEFI mode
- BIOS BBCN16WW(V1.03)
- Ubuntu mate 15.10 with kernel 4.2.0 => can suspend
- Windows 8.1 => can suspend
- since BIOS upgrade to BBCN16WW(V1.07)
- Windows 8.1 => is unaffected and still can suspend
- Ubuntu mate 15.10
- with kernel 4.2.x => cannot suspend
- Debian testing
- with kernel 4.3.x => cannot suspend
- with kernel 4.4.x => cannot suspend
- with kernel 4.5.x => cannot suspend
- with kernel 4.6.x => cannot suspend
- OpenBSD 5.9 => completely fails to suspend even the first time,
possibly due to unrelated issues or my incompetence (I will report progress if
I manage to get it to suspend at least once)
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https://bugs.launchpad.net/bugs/1528735
Title:
Suspend reboots every second time on Lenovo G50-45
Status in pm-utils package in Ubuntu:
Confirmed
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).
(http://askubuntu.com/questions/675683/suspend-does-not-work-more-
than-once-after-reboot-ubuntu-15-04-dual-boot/712232 and earlier
http://askubuntu.com/questions/651481/boot-script-table-modified-
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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