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[Launchpad Bug Tracker <1391984@xxxxxxxxxxxxxxxxxx>]

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

** Changed in: xorg (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1391984

Title:
  [MacBookAir6,2] Max resolution of external monitor degrades when
  upgrading from 13.10 to 14.04.1

Status in xorg package in Ubuntu:
  Expired

Bug description:
  On a Macbook Air 2013 (6,2), I used to run Mint 16 XFCE (natively, not via virtualization), and had my external Samsung display happily running at its max resolution of 2560x1440 via a HDMI adapter.
  I confirmed the same resolution can be obtained when booting Xubuntu 13.10 from USB.

  I recently upgraded to Xubuntu 14.04.1 and now the external display will not run at anything higher than 1920x1200.
  xrandr does not show anything higher than that available. 
  Confirmed the same issue exists in Mint 17 XFCE when booting from USB.

  Note I am not sure if the kernel is in fact the issue, but such was suggested on this thread where I found what appears to be the same issue here: 
  http://ubuntuforums.org/showthread.php?t=2218618
  ... though without a resolution, and I am not a system76 customer.

  xrandr output:
  Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 32767 x 32767
  eDP1 connected (normal left inverted right x axis y axis)
     1440x900       60.0 +   59.9  
     1360x768       59.8     60.0  
     1152x864       60.0  
     1024x768       60.0  
     800x600        60.3     56.2  
     640x480        59.9  
  DP1 disconnected (normal left inverted right x axis y axis)
  HDMI1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
     1920x1200      60.0  
     1920x1080      60.0*    50.0     59.9  
     1600x1200      60.0  
     1680x1050      59.9  
     1280x1024      75.0     60.0  
     1440x900       59.9  
     1280x960       60.0  
     1280x800       59.9  
     1152x864       75.0  
     1280x720       60.0     50.0     59.9  
     1024x768       75.1     70.1     60.0  
     832x624        74.6  
     800x600        72.2     75.0     60.3     56.2  
     720x576        50.0  
     720x480        60.0     59.9  
     640x480        75.0     72.8     66.7     60.0     59.9  
     720x400        70.1  
  DP2 disconnected (normal left inverted right x axis y axis)
  HDMI2 disconnected (normal left inverted right x axis y axis)
  VIRTUAL1 disconnected (normal left inverted right x axis y axis)

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Nov 12 12:46:52 2014
  InstallationDate: Installed on 2014-11-09 (3 days ago)
  InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: XFCE
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroRelease: Ubuntu 14.04
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a26] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Apple Inc. Device [106b:011b]
  InstallationDate: Installed on 2014-11-09 (21 days ago)
  InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
  LightdmGreeterLog:
   ** (lightdm-gtk-greeter:1450): WARNING **: Failed to load user image: Failed to open file '/home/pw/.face': No such file or directory
   init: indicator-power main process (1574) killed by TERM signal
   init: indicator-application main process (1583) terminated with status 1
  LightdmGreeterLogOld:
   ** (lightdm-gtk-greeter:1404): WARNING **: Failed to load user image: Failed to open file '/home/pw/.face': No such file or directory
   init: indicator-power main process (1542) killed by TERM signal
   init: indicator-application main process (1556) killed by TERM signal
  MachineType: Apple Inc. MacBookAir6,2
  NonfreeKernelModules: wl
  Package: xorg 1:7.7+1ubuntu8
  PackageArchitecture: amd64
  ProcKernelCmdLine: \boot\vmlinuz-3.13.0-40-generic.efi.signed root=UUID=93f70a4c-7121-4395-a441-a288a38b846b ro $vt_handoff pcie_aspm=force i915.lvds_downclock=1 acpi_backlight=vendor initrd=boot\initrd.img-3.13.0-40-generic
  ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
  Tags:  trusty ubuntu
  Uname: Linux 3.13.0-40-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/24/2014
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBA61.88Z.0099.B12.1405241030
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-7DF21CB3ED6977E5
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookAir6,2
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-7DF21CB3ED6977E5
  dmi.modalias: dmi:bvnAppleInc.:bvrMBA61.88Z.0099.B12.1405241030:bd05/24/2014:svnAppleInc.:pnMacBookAir6,2:pvr1.0:rvnAppleInc.:rnMac-7DF21CB3ED6977E5:rvrMacBookAir6,2:cvnAppleInc.:ct10:cvrMac-7DF21CB3ED6977E5:
  dmi.product.name: MacBookAir6,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.2
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1.3
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Sun Nov 30 23:31:38 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               40176 
   vendor                                     APP
  xserver.version: 2:1.15.1-0ubuntu2.1

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