I've backported the upstream patch to the xserver-xorg-video-intel package from utopic-updates and can confirm that it fixes the broken window shadows for GTK+ 3.14 apps that use client decorations (e.g. gedit).
I've backported the upstream patch to the xserver- xorg-video- intel package from utopic-updates and can confirm that it fixes the broken window shadows for GTK+ 3.14 apps that use client decorations (e.g. gedit).