Comment 16 for bug 1307559

I have the same problem with 15.04

main screen is a Lenovo Thinkpad e120
external display is on HDMI, is an older Samsung 16:10 lcd screen

I have a temporary fix for that, which consists in pressing super+P key - the displays will cycle through configuration possibilities (use both or display only 1 and set the resolution) - when doing so the displays will redraw the windows and the window decorations will reapper

it's a bit annoying because I have to do this at every single startup