Public bug reported:
Boot error occurs in a 64-bit system and only when certain conditions are met:
BIOS/UEFI Settings:
Config -> Display -> Graphics Device [Discrete Graphics]
-> OS Detection for NVIDIA Optimus [Disabled]
Security -> Virtualization -> VT-x enabled
-> VT-d enabled
System hangs at boot time either after kernel log shows:
[ 1.043982] ACPI: Video Device [VID1] (multi-head: yes rom: yes post: no)
[ 1.047138] FUJITSU Extended Socket Network Device Driver - version 1.0 -
Copyright (c) 2015 FUJITSU LIMITED
or later after:
[OK] Started Load/Save Screen Backlight Brightness of backlight:nv_backlight.
The error occurs randomly (about 50% of all boot tries).
The error has already been known for a long time (e.g.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/776999) and has
never been fixed. It also occurs for older BIOS/UEFI versions and Ubuntu
versions (e.g. 14.04) than shown in the report. Other related reports
can be found here:
https://bugzilla.kernel.org/show_bug.cgi?id=43054
https://bugzilla.kernel.org/show_bug.cgi?id=156341
https://bugzilla.opensuse.org/show_bug.cgi?id=1022443
https://ubuntuforums.org/showthread.php?t=2044699
https://binaryimpulse.com/2014/08/lenovo-thinkpad-w520-workaround-for-linux-freezing-issue-at-boot/
https://forums.lenovo.com/t5/Linux-Discussion/64-bit-Linux-W520-amp-nVidia/td-p/577789/page/2
A workaround for this issue is to add kernel parameter "nox2apic" to the
GRUB_CMDLINE_LINUX_DEFAULT line. Another possible workaround (at least
for the first hanging position is to use kernel parameters 'acpi_osi=!
acpi_osi="!Windows 2009"' instead.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-77-generic 4.4.0-77.98
ProcVersionSignature: Ubuntu 4.4.0-77.98-generic 4.4.59
Uname: Linux 4.4.0-77-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: cbergler 2040 F.... pulseaudio
/dev/snd/controlC0: cbergler 2040 F.... pulseaudio
CurrentDesktop: XFCE
Date: Wed May 3 13:03:38 2017
HibernationDevice: RESUME=UUID=19c8581e-f65b-4382-a940-e82a48d9297f
MachineType: LENOVO 42844AG
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-77-generic
root=UUID=2f25428b-c54c-422e-be18-18233f17990d ro nox2apic
RelatedPackageVersions:
linux-restricted-modules-4.4.0-77-generic N/A
linux-backports-modules-4.4.0-77-generic N/A
linux-firmware 1.157.8
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/20/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: 8BET63WW (1.43 )
dmi.board.asset.tag: Not Available
dmi.board.name: 42844AG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr8BET63WW(1.43):bd10/20/2016:svnLENOVO:pn42844AG:pvrThinkPadW520:rvnLENOVO:rn42844AG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 42844AG
dmi.product.version: ThinkPad W520
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty xenial
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https://bugs.launchpad.net/bugs/1687910
Title:
[Lenovo W520] Linux Freezing Issue At Boot
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