Black screen on monitor connected via Mini Display Port

[Mathieu Alorent]

I'm on Dell XPS 13 2015 edition, since about two weeks, my second monitor connected via Mini Display Port doesn't work well ; ie the screen led report it as "on", the "Settings -> Display" tools detect it successfully, screen is extended, BUT screen stay black.

Sometimes, while I'm working (with the black screen on the second monitor), the second monitor woke up. I can use it, but after automatic "screen turn off" (while I'm away), the second screen doesn't woke up.

If I disconnect-reconnect, the mini display port, nothing happens, and Xorg.0.log doesn't detect something (this is why I've opened the bug on "linux-image-generic" and not on "Xorg").

I would be happy to find my second display working again, and help to fix the problem.
Please, let me know how I can help, report, test, etc...

$ cat /proc/version_signature
Ubuntu 3.19.0-26.27-generic 3.19.8-ckt4

$ lsb_release -rd
Description: Ubuntu 15.04
Release: 15.04

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-26-generic 3.19.0-26.27
ProcVersionSignature: Ubuntu 3.19.0-26.27-generic 3.19.8-ckt4
Uname: Linux 3.19.0-26-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.17.2-0ubuntu1.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: kumy 1513 F.... pulseaudio
 /dev/snd/controlC1: kumy 1513 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Aug 3 15:20:29 2015
HibernationDevice: RESUME=UUID=8a16d494-b05c-4d52-a204-b648a935d547
InstallationDate: Installed on 2015-05-07 (88 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: Dell Inc. XPS 13 9343
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-26-generic.efi.signed root=UUID=58a8d291-24fa-4b38-8c10-65f03c728711 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-26-generic N/A
 linux-backports-modules-3.19.0-26-generic N/A
 linux-firmware 1.143.2
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/14/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A05
dmi.board.name: 0310JH
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA05:bd07/14/2015:svnDellInc.:pnXPS139343:pvr:rvnDellInc.:rn0310JH:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: XPS 13 9343
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Does this issue go away if you boot the previous kernel version?

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.2 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/v4.2-rc5-unstable/

[Mathieu Alorent (kumy)]

I'm sorry it seems to be a hardware problem.
Closing for now.

[Mathieu Alorent (kumy)]

Received a new cable. And I can confirm that was a hardware problem.
Sorry for the noise.