** Tags added: cscc
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https://bugs.launchpad.net/bugs/1724911
Title:
text VTs are unavailable on desktop after upgrade to Ubuntu 17.10
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Artful:
Fix Released
Bug description:
== SRU Justification ==
After upgrading my laptop to Ubuntu 17.10, I am unable to access gettys on
any of the text-mode VTs on my system.
gdm3 is running on VT1, my user session is running on VT2. I can
switch between these. If I switch to VT3, I know that the VT switch
has happened in the kernel because the X cursor disappears; but the
display retains the output of my X session, and the text console with
getty never appears.
Switching back to VT2 works fine.
The same problem occurs with either Wayland or X.
My laptop is docked with an external monitor, which could be a factor.
(I also notice that during boot, plymouth is only rendered on the
internal monitor, not the external monitor; this may be related). I
have not yet tested whether this problem is reproducible if I undock.
The system is booting with vt.handoff=7, which I believe is still the
default in Ubuntu 17.10.
This bug is a regression in Artful introduced by mainline commit:
7581d5ca2bb ("drm/i915/fbdev: Check for existence of ifbdev->vma before
operations").
It was first found that this bug was fixed in v4.14-rc1. However, after a
lengthy
"Reverse" bisect, the exact commit could not be identified. This is because
the
fix came in via a merge base. A regular bisect was then done to identify
commit
7581d5ca2bb as the offending commit that introduced the bug. Using the file
that this commit touched, a "Reverse" bisect was done again between
7581d5ca2bb..v4.14-rc1. This identified the following commit 88be58be886f as
the fix to this regression.
== Fix ==
commit 88be58be886f1215cc73dc8c273c985eecd7385c
Author: Daniel Vetter <daniel.vet...@ffwll.ch>
Date: Thu Jul 6 15:00:19 2017 +0200
drm/i915/fbdev: Always forward hotplug events
== Regression Potential ==
This patch fixes a current regression and is a minor one-liner.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: linux-image-4.13.0-16-generic 4.13.0-16.19
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: vorlon 24080 F.... pulseaudio
/dev/snd/controlC0: vorlon 24080 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 19 09:57:59 2017
HibernationDevice: RESUME=UUID=6df76279-19ea-45a4-bec9-e4fdc858729a
InstallationDate: Installed on 2010-09-24 (2582 days ago)
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64
(20100816.1)
MachineType: LENOVO 2306CTO
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-16-generic.efi.signed
root=/dev/mapper/hostname-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-4.13.0-16-generic N/A
linux-backports-modules-4.13.0-16-generic N/A
linux-firmware 1.169
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to artful on 2017-10-19 (0 days ago)
dmi.bios.date: 10/25/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: G2ET97WW (2.57 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2306CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvrG2ET97WW(2.57):bd10/25/2013:svnLENOVO:pn2306CTO:pvrThinkPadX230:rvnLENOVO:rn2306CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.family: ThinkPad X230
dmi.product.name: 2306CTO
dmi.product.version: ThinkPad X230
dmi.sys.vendor: LENOVO
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