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[gobble <gobbledegeek@xxxxxxxxx>]

I use a dell xps 13 9343 with a 3200x1800 screen res and adding the
command xserver-command=X -dpi 144 to the lightdm.conf results in Ubuntu
booting in low res troubleshooting mode - I never get to the unity-
greeter screen. From the logs I gather that  X  shuts down. I had to
boot into recovery mode and remove that line to be able to login.

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https://bugs.launchpad.net/bugs/1375223

Title:
  unity-greeter ignores lightdm display resolution and DPI settings

Status in unity-greeter package in Ubuntu:
  Confirmed

Bug description:
  I have a laptop with a very high-res screen (Lenovo Yoga 2 Pro with 3200x1600 screen). To make this more usable I set the display to a resolution of 1920x1080 and a higher DPI of 120x120 in the LightDM  settings:
  xserver-command=X -dpi 120
  display-setup-script=xrandr --output eDP1 --mode 1920x1080  --primary

  These settings are ignored or overridden by the unity-greeter. Other
  greeters, e.g. lightdm-kde-greeter, correctly apply these settings.

  Steps to reproduce:
  1. Change your DPI and resolution settings to be something other than the default for your laptop's display in /etc/lightdm/lightdm.conf, using xserver-command and display-setup-script as above
  2. Ensure lightdm is set to use the unity-greeter
  2. Restart lightdm or reboot the laptop

  Expected results:
  The lightdm Unity login screen is shown with the resolution and DPI you set using xserver-command and display-setup-script in lightdm.conf

  Actual results:
  The settings are ignored/overridden and lightdm shows the login screen using the default resolution and DPI for your device

  Workaround:
  Use lightdm-kde-greeter:
  sudo apt-get install lightdm-kde-greeter
  greeter-session=lightdm-kde-greeter

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity-greeter 14.04.10-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
  Uname: Linux 3.13.0-36-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Sep 29 12:08:56 2014
  InstallationDate: Installed on 2014-09-16 (12 days ago)
  InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  SourcePackage: unity-greeter
  UpgradeStatus: No upgrade log present (probably fresh install)

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