Ultra Dock external displays not detected after suspend/resume cycle

[Yaniv Dary]

eee

ProblemType: Bug
DistroRelease: elementary 0.4
Package: linux-image-4.4.0-53-generic 4.4.0-53.74 [origin: Ubuntu]
ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30
Uname: Linux 4.4.0-53-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC1D0p: ydary 1888 F...m pulseaudio
 /dev/snd/controlC1: ydary 1888 F.... pulseaudio
 /dev/snd/controlC0: ydary 1888 F.... pulseaudio
CurrentDesktop: Pantheon
Date: Tue Dec 6 16:31:43 2016
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=edf05f1b-a01f-4cdf-86e7-f69ce2622908
InstallationDate: Installed on 2016-09-21 (76 days ago)
InstallationMedia: elementary OS 0.4 "Loki" - Stable amd64 (20160909)
MachineType: LENOVO 20ARS19C02
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-53-generic root=UUID=33367c4c-2075-4a2b-95b7-e7e7de80824c ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-53-generic N/A
 linux-backports-modules-4.4.0-53-generic N/A
 linux-firmware 1.157.5
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/21/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: GJET91WW (2.41 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20ARS19C02
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:bvrGJET91WW(2.41):bd09/21/2016:svnLENOVO:pn20ARS19C02:pvrThinkPadT440s:rvnLENOVO:rn20ARS19C02:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20ARS19C02
dmi.product.version: ThinkPad T440s
dmi.sys.vendor: LENOVO

[Yaniv Dary (dyaniv)]

I'm using T440s with docking station with the same issue as in #1568573. I was trying to add info into bug #1568573, but a new bug was created. How do I cross post the debug info into that bug?

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.9 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'.

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/v4.9-rc8

[Yaniv Dary (dyaniv)]

I tested this with v4.9-rc8 and it work on that kernel.
That kernel does have another bug due. When I detach the computer the display doesn't revert back to one screen, alt+ctrl+F1 to another console and back to UI resolves this.

[Yaniv Dary (dyaniv)]

And yes this started in one of the recent kernels, I believe it was around 4.4.0-41.

[Yaniv Dary (dyaniv)]

After using it for a while I notices another bug.
Connecting to dock causes screen to split and monitor is started for a few seconds, but then turn off and only the laptop display is shown, but main desktop is on the other display.