The 2.15.0 release is an unstable release of GDM with the following new features:

- Explicitly adjust the effective GID before running the child session program to avoid remaining with high privileges. Fixes bug #340347. (Julio M. Merino Vidal)

- Now allow the PAM Stack to be specified in the GDM configuration instead of being hardcoded to "gdm". (Brian Cameron)

- Per-display configuration is now supported. The user may create /etc/gdm/custom.conf:<dispnum> files (/etc/gdm/custom.conf:0 for display :0) and GUI related configuration settings in the per-display file will override for that display. (Brian Cameron)

- Greeter themes now support real GTK+ button types, making gdmgreeter better support a11y and allow GTK themeable buttons. (Brian Cameron)

- New pam-error-logo greeter type to allow an image to be displayed only when the PAM error message label is showing a message. (Brian Cameron)

- Updated config/gettextfoo.h to reflect current strings for translation. Fixes bug #340017. (Brian Cameron)

- Updated comments in GDM configuration files (Brian Cameron)

- GDM now uses the string "Start Over" instead of "Cancel" in the GUI. (Brian Cameron)

- Many updates to documentation. Explain gtk-theme greeter tag, new button and pam-error-icon, and startover greeter types, and better info about PAM. (Brian Cameron)