External displays disabled after login - regression in 4.4.0-72.93 -> 4.4.0-75.96 update

[Hannu Koivisto]

With Dell E7440 with Intel graphics, attached to dock and also two external displays connected to the dock:

when I boot the machine, the built-in display and the external displays are enabled in login screen. However, the external displays are disabled when I log in.

All displays remain enabled after login with 4.4.0-72.93. I never installed 4.4.0-73.94 or 4.4.0-74.95 but I can see in the changelog that there were i915 changes in 4.4.0-73.94.

The external displays are shown and are marked enabled in KDE's System Settings / Display and Monitor / Display Configuration. If I first mark them disabled (and apply the configuration) and then mark them enabled (and apply the configuration), they are actually enabled.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-75-generic 4.4.0-75.96
ProcVersionSignature: Ubuntu 4.4.0-75.96-generic 4.4.59
Uname: Linux 4.4.0-75-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: hannuko 2338 F.... pulseaudio
 /dev/snd/controlC0: hannuko 2338 F.... pulseaudio
CurrentDesktop: KDE
Date: Thu Apr 27 19:39:12 2017
HibernationDevice: RESUME=UUID=43dbb372-1944-40d4-b1ea-94193bf0bbb2
InstallationDate: Installed on 2015-12-21 (493 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Dell Inc. Latitude E7440
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-75-generic root=/dev/mapper/kubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-75-generic N/A
 linux-backports-modules-4.4.0-75-generic N/A
 linux-firmware 1.157.8
SourcePackage: linux
UpgradeStatus: Upgraded to xenial on 2016-12-30 (117 days ago)
dmi.bios.date: 02/02/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A14
dmi.board.name: 07F3F4
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA14:bd02/02/2015:svnDellInc.:pnLatitudeE7440:pvr01:rvnDellInc.:rn07F3F4:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E7440
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream stable kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.4 stable kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.63

[Jeremy (peprpack)]

I rebooted today and now none of my three monitors (DVI, VGA, Displayport) are not working with the docking station. Network, Power, and USB functions still work.

I did update to 4.4.0-75 stable.

I have a Dell Latitude E7470. I updated the BIOS to the latest version. When I go to displays nothing can be detected. I will verify the HDMI, and mini-display ports without the docking station when I get home as I have no adapters at work. I had cleaned out my kernel versions, but going back two versions did not work yet. I will keep trying and will look into my logs.

Cheers,

Jeremy

[Jeremy (peprpack)]

Update, I am able to use the displayport and the hdmi interfaces on the back of my laptop. Issue appears to be related to use of the docking station.

Cheers,

Jeremy

[Hannu Koivisto (azure)]

Tested with v4.4.65, the latest v4.4 stable kernel as of this writing. The problem happens with that as well.

kernel-bug-exists-upstream tag added and the bug marked Confirmed as instructed (even though "Confirmed" description says "Verified by someone other than the reporter.")

[Matthias Schmidt (c4e5f7fcbcef759)]

I have a Dell Latitude E7450 here and can confirm the problem. As soon as I try to activate both monitors over the docking station I end up in a kernel panic. When I go back to to 4.4.0-72-generic all works as expected.

NAME="Ubuntu"
VERSION="16.04.2 LTS (Xenial Xerus)"

Let me know if you need more information.

[Matthias Schmidt (c4e5f7fcbcef759)]

My syslog with the relevant kernel panic.

[Joseph Salisbury (jsalisbury)]

Can you ensure you have the linux-image AND linux-image-extra .deb packages installed?

[Matthias Schmidt (c4e5f7fcbcef759)]

@jsailsbury: At least for my case the extra package is installed for all kernel versions.

[Hannu Koivisto (azure)]

I have linux-image-extra-${ver}-generic for each normal Ubuntu linux-image-${ver}-generic package.

There are no linux-image-extra packages for upstream kernels in http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.*/