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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: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug bionic dist-upgrade i386
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upgrade to Linux 4.15.0-48-generic crashes display on lenovo G500
https://bugs.launchpad.net/bugs/1828906
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