[Bug 1828906] [NEW] upgrade to Linux 4.15.0-48-generic crashes display on lenovo G500

[Jeff]

Public bug reported:

Last week my Lenovo G500 laptop running ubuntu 18.04 reported an
available system update of about 180 MBs, which included a kernel
version update. I installed it and following the reboot, the display
hung with a purple screen with bands of random colored pixels across the
screen.

If I reboot and hold down SHIFT to get to GRUB, it presents the
following choices under Advanced Options:

	Ubuntu, with Linux 4.15.0-48-generic
	Ubuntu, with Linux 4.15.0-48-generic (recovery mode)
	Ubuntu, with Linux 4.15.0-47-generic
	Ubuntu, with Linux 4.15.0-47-generic (recovery mode)

If I select 4.15.0-48-generic, I get the display hang problem described
above or other forms of display misbehavior (sometimes it flashes
continuously, sometimes it just hangs at a black screen, its not
consistent).

If I select 4.15.0-47-generic, it boots up just fine to a completely
usable desktop. Every time.

I've tried running boot-repair. It reported that it had repaired GRUB,
but the problem persists. So I don't think its a boot parameters
problem. I conclude that the problem has something to do with the
display driver in 4.15.0-48-generic that was not present in
4.15.0-47-generic.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.31
ProcVersionSignature: Ubuntu 4.15.0-47.50-generic 4.15.18
Uname: Linux 4.15.0-47-generic i686
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: i386
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon May 13 18:11:02 2019
InstallationDate: Installed on 2019-04-18 (25 days ago)
InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release i386 (20190227.1)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDistupgradeAptlog:
 Log time: 2019-05-13 16:34:52.461061
 Starting pkgProblemResolver with broken count: 0
 Starting 2 pkgProblemResolver with broken count: 0
 Done
 Log time: 2019-05-13 16:35:07.526926

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug bionic dist-upgrade i386

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ubuntu-release-upgrader in
Ubuntu.
https://bugs.launchpad.net/bugs/1828906

Title:
  upgrade to Linux 4.15.0-48-generic crashes display on lenovo G500

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Last week my Lenovo G500 laptop running ubuntu 18.04 reported an
  available system update of about 180 MBs, which included a kernel
  version update. I installed it and following the reboot, the display
  hung with a purple screen with bands of random colored pixels across
  the screen.

  If I reboot and hold down SHIFT to get to GRUB, it presents the
  following choices under Advanced Options:

  	Ubuntu, with Linux 4.15.0-48-generic
  	Ubuntu, with Linux 4.15.0-48-generic (recovery mode)
  	Ubuntu, with Linux 4.15.0-47-generic
  	Ubuntu, with Linux 4.15.0-47-generic (recovery mode)

  If I select 4.15.0-48-generic, I get the display hang problem
  described above or other forms of display misbehavior (sometimes it
  flashes continuously, sometimes it just hangs at a black screen, its
  not consistent).

  If I select 4.15.0-47-generic, it boots up just fine to a completely
  usable desktop. Every time.

  I've tried running boot-repair. It reported that it had repaired GRUB,
  but the problem persists. So I don't think its a boot parameters
  problem. I conclude that the problem has something to do with the
  display driver in 4.15.0-48-generic that was not present in
  4.15.0-47-generic.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.31
  ProcVersionSignature: Ubuntu 4.15.0-47.50-generic 4.15.18
  Uname: Linux 4.15.0-47-generic i686
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon May 13 18:11:02 2019
  InstallationDate: Installed on 2019-04-18 (25 days ago)
  InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release i386 (20190227.1)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)
  VarLogDistupgradeAptlog:
   Log time: 2019-05-13 16:34:52.461061
   Starting pkgProblemResolver with broken count: 0
   Starting 2 pkgProblemResolver with broken count: 0
   Done
   Log time: 2019-05-13 16:35:07.526926

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1828906/+subscriptions