Problem: Boot and LoginScreen resolution are O.K. - 1366x768, but after login the resolution drop down to 1024x768. In the options I can select the 1366x768 resolution again, but looks like it doesn't save it, because in the next reboot it drop back again to 1024x768.
I have a Intel Integrated Video Card, on Dell Inspiron 1545 running Ubuntu 11.10, 4GB RAM & 320 HD.
xrandr --output LVDS1 --mode 1366x768
and linked it to this keyboard shortcut: Crtl+Alt+z, and I run it after login, and that is.