Public bug reported:
This started for no appearent reason (but after reading about similar problems,
I guess that it started after kernel update)
My Ubuntu 16.04 crashes (freezes) everytime I restart or shutdown (soft). And I
have to use hard shutdown.
After that, Ubuntu starts normally, and runs without problems until the next
restart or shutdown.
The syslog file does not display any abnormalities. Nor does the file kern.log
However, directory /var/crash/ contains 2 files with relevant information
(_usr_lib_x86_64-linux-gnu_xfce4_panel_wrapper-1.0.1000.crash and
_usr_bin_xfwm4.1000.crash). I attach them. I also attach a few photographs of
the last screens.
All of the crashes involve kernel paging, but everytime at a different location:
BUG: unable to handle kernel paging request at
ffff89??258e9100light:intel_backlight
BUG: unable to handle kernel paging request at
ffff919e6545e100light:intel_backlight
BUG: unable to handle kernel paging request at ffff98d2e58b6100Load/Save Screen
Backlight Brightness of leds:dell::kbd_backlight
System info.
Computer: Dell Inspiron 7567 i7-7700HQ/GTX1050Ti
OS: Ubuntu 16.04.3 LTS
Kernel: 4.13.0-30-generic
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.13.0-30-generic 4.13.0-30.33~16.04.1
ProcVersionSignature: Ubuntu 4.13.0-30.33~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-30-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Jan 17 18:30:32 2018
InstallationDate: Installed on 2017-04-23 (268 days ago)
InstallationMedia: Xubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215)
SourcePackage: linux-hwe
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: linux-hwe (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug backlight crash kernel-bug package-from-proposed
xenial xubuntu-exp
** Attachment added: "crash screenshot"
https://bugs.launchpad.net/bugs/1743848/+attachment/5038352/+files/20180115_225947.jpg
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https://bugs.launchpad.net/bugs/1743848
Title:
Ubuntu 16.04 crashes on shutdown / restart
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