gdm does set PAM_TTY but it seems to be set much later in the pam processing than on lightdm, so basically its not set until after authentication.
I suppose gdm will have to be patched or we somehow override the pam config for gdm only (if that is even possible) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to pam in Ubuntu. https://bugs.launchpad.net/bugs/1561302 Title: gdm won't allow passwordless login Status in gdm: Confirmed Status in Ubuntu GNOME: Triaged Status in casper package in Ubuntu: New Status in gdm3 package in Ubuntu: Triaged Status in gnome-shell package in Ubuntu: New Status in pam package in Ubuntu: Invalid Bug description: The Live session user does not have a password set, however gdm won't allow login in this case since the "Sign In" button is disabled. Normally this should be too much of an issue, since the login screen should only be hit on logout from the live session, some people are reporting hitting the gdm login screen on boot due to ubiquity-dm failing to boot. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: gdm3 3.18.2-1ubuntu1 ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6 Uname: Linux 4.4.0-15-generic x86_64 ApportVersion: 2.20-0ubuntu3 Architecture: amd64 CurrentDesktop: GNOME Date: Thu Mar 24 13:55:19 2016 InstallationDate: Installed on 2016-03-23 (0 days ago) InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323) SourcePackage: gdm3 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/gdm/+bug/1561302/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
