MacbookPro 12,1 Apple external VGA thunderbolt/displayport display non-functional

[Michael Gratton]

The Apple VGA thunderbolt/displayport adaptor seems to be non-functional on my MacbookPro 12,1. After plugging it in with a projector attached, the projector does not show up in the display control panel and xrandr reports DP1, DP2, HDMI1, HDMI2 and VIRTUAL1 displays all disconnected. When inserting the adaptor, the following is printed in kern.log:

> Nov 26 16:13:26 payens kernel: [ 498.959901] thunderbolt 0000:07:00.0: resetting error on 0:c.
> Nov 26 16:13:26 payens kernel: [ 498.959926] thunderbolt 0000:07:00.0: 0:c: got unplug event for disconnected port, ignoring
> Nov 26 16:13:27 payens kernel: [ 499.161674] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!

The last line repeats ~20 times.

I tried tried 4.4-rc2 from the mainline kernel PPA, and the same thing occurs.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-18-generic 4.2.0-18.22
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: mjg 1616 F.... pulseaudio
 /dev/snd/controlC0: mjg 1616 F.... pulseaudio
CurrentDesktop: GNOME
Date: Thu Nov 26 16:07:31 2015
HibernationDevice: RESUME=UUID=bc879a1f-ac27-48ae-82dd-3c81b7307dd0
InstallationDate: Installed on 2015-07-22 (127 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 05ac:0273 Apple, Inc.
 Bus 001 Device 002: ID 05ac:8290 Apple, Inc.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Apple Inc. MacBookPro12,1
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-18-generic root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash acpi_backlight=vendor
RelatedPackageVersions:
 linux-restricted-modules-4.2.0-18-generic N/A
 linux-backports-modules-4.2.0-18-generic N/A
 linux-firmware 1.149.2
RfKill:
 0: phy0: Wireless LAN
  Soft blocked: no
  Hard blocked: no
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: Upgraded to wily on 2015-08-27 (90 days ago)
dmi.bios.date: 09/28/2015
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP121.88Z.0167.B14.1509281135
dmi.board.name: Mac-E43C1C25D4880AD6
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro12,1
dmi.chassis.type: 9
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-E43C1C25D4880AD6
dmi.modalias: dmi:bvnAppleInc.:bvrMBP121.88Z.0167.B14.1509281135:bd09/28/2015:svnAppleInc.:pnMacBookPro12,1:pvr1.0:rvnAppleInc.:rnMac-E43C1C25D4880AD6:rvrMacBookPro12,1:cvnAppleInc.:ct9:cvrMac-E43C1C25D4880AD6:
dmi.product.name: MacBookPro12,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

[Michael Gratton (mjog)]

Also, the adaptor remains non-functional if booted with it plugged in, in addition to attempting to hot-plug it.

[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 kernel version where you were not having this particular problem? This will help determine if the problem you are seeing is the result of a regression, and when this regression was introduced. If this is a regression, we can perform a kernel bisect to identify the commit that introduced the problem.

[Michael Gratton (mjog)]

It hasn't worked on the MBP 12,1 on any of the 4.x kernels, and I'm pretty sure it didn't work on 3.x either.

The same adaptor was working with an older (pre-Thunderbolt) MBP, but not this model.