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[Paul Winkler <slinkp@xxxxxxxxx>]

Confirmed same resolution limitation exists in 14.10.

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

Title:
  Max resolution of external monitor degrades when upgrading from 13.10
  to 14.04.1

Status in “xorg” package in Ubuntu:
  New

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)

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