Resize window actions for left and right placement don't work

In previous versions of Ubuntu I could press the combination of keys several times (Ctrl+Alt+Num4 or Num6) to re-size window to different width.

Now this functionality doesn't work on Ubuntu 12.04. Though it possible to place to left/right/top/bottom corners with different width so left/right placement should work somehow.

How to restore the left/right placement with changing width?