GDM resolution

[mx.]

How can I change resolution of the GDM login window? It's too large and I cannot the buttons which are at the bottom.

[jis]

You need a "Virtual" line in DISPLAY SUBSECTION of xorg.conf. Type "man xorg.conf" in terminal for more help.

I wish you could change the resolution in Login window Preferences (that can be lauched by "gksu /usr/sbin/gdmsetup").