Package: rxvt-unicode-256color Version: 9.22-1 After upgrading to xorg-server 2:1.18.3-2 on Stretch the 'transparency' setting in my ~/.Xresources for RXVT is no longer functional.
Copying /usr/share/doc/xserver-xorg-video-intel/xorg.conf to /etc/X11 and restarting X resolves the issue. I suggest the default be set to what's contained in the sample xorg.conf to mitigate the issue. I'm using Debian Stretch on AMD64 with kernel version 4.6.0-1.