MacBookAir Mini dp to VGA Adapter not recogonised

[Bedlore]

Running 3.13 my macbook air lightning mini dp to vga adapter is not recognized which has it been previously. The mini dp to HDMI is recognised however.

With VGA adapter connected to macbook air
bedlore@brendan-MacBookAir:~$ xrandr
Screen 0: minimum 8 x 8, current 1366 x 768, maximum 32767 x 32767
eDP1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 256mm x 144mm
   1366x768 60.0*+
   1360x768 59.8 60.0
   1024x768 60.0
   800x600 60.3 56.2
   640x480 59.9
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

This appears to be a duplicate of an older bug #1222734

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-53-lowlatency 3.13.0-53.89
ProcVersionSignature: Ubuntu 3.13.0-53.89-lowlatency 3.13.11-ckt19
Uname: Linux 3.13.0-53-lowlatency x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: bedlore 3142 F.... pulseaudio
CurrentDesktop: X-Cinnamon
Date: Wed Jun 10 22:35:57 2015
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=e7b77caf-d0cc-4e31-81a1-2ff71946d345
InstallationDate: Installed on 2014-03-11 (456 days ago)
InstallationMedia: Ubuntu-Studio 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: Apple Inc. MacBookAir5,1
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-53-lowlatency root=UUID=8cf2fd1b-4414-4bbb-bded-54f3dc071221 ro pcie_aspm=force i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-53-lowlatency N/A
 linux-backports-modules-3.13.0-53-lowlatency N/A
 linux-firmware 1.127.12
SourcePackage: linux
UpgradeStatus: Upgraded to trusty on 2014-05-22 (384 days ago)
dmi.bios.date: 11/27/2012
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBA51.88Z.00EF.B02.1211271028
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-66F35F19FE2A0D05
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookAir5,1
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-66F35F19FE2A0D05
dmi.modalias: dmi:bvnAppleInc.:bvrMBA51.88Z.00EF.B02.1211271028:bd11/27/2012:svnAppleInc.:pnMacBookAir5,1:pvr1.0:rvnAppleInc.:rnMac-66F35F19FE2A0D05:rvrMacBookAir5,1:cvnAppleInc.:ct10:cvrMac-66F35F19FE2A0D05:
dmi.product.name: MacBookAir5,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple 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 kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.1 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/v4.1-rc7-unstable/

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]