I am also having this problem while using Thinkpad T460s with a 2560x1440 resolution monitor.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lightdm in Ubuntu. https://bugs.launchpad.net/bugs/1571640 Title: lightdm changing resolution Status in lightdm package in Ubuntu: Confirmed Bug description: Just after the upgrade to ubuntu 16.04, when lightdm starts the resolution is 2560x1600. Then, after about half a second it is automatically changed to 1280x800. This happens systematically at each boot. No external monitor is connected. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: lightdm 1.18.1-0ubuntu1 Uname: Linux 4.5.0-040500-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 CurrentDesktop: Unity Date: Mon Apr 18 14:39:03 2016 EcryptfsInUse: Yes InstallationDate: Installed on 2014-11-09 (525 days ago) InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1) SourcePackage: lightdm UpgradeStatus: Upgraded to xenial on 2016-04-18 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1571640/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
