Install firmware versions that match the kernel, i.e. from sid.

config/chroot_apt/preferences

@@ -43,6 +43,46 @@ Package: virtualbox-guest-x11
 Pin: origin backports.debian.org
 Pin-Priority: 999
 
+Package: firmware-atheros
+Pin: release o=Debian,a=unstable
+Pin-Priority: 999
+
+Package: firmware-brcm80211
+Pin: release o=Debian,a=unstable
+Pin-Priority: 999
+
+Package: firmware-ipw2x00
+Pin: release o=Debian,a=unstable
+Pin-Priority: 999
+
+Package: firmware-iwlwifi
+Pin: release o=Debian,a=unstable
+Pin-Priority: 999
+
+Package: firmware-linux
+Pin: release o=Debian,a=unstable
+Pin-Priority: 999
+
+Package: firmware-linux-free
+Pin: release o=Debian,a=unstable
+Pin-Priority: 999
+
+Package: firmware-linux-nonfree
+Pin: release o=Debian,a=unstable
+Pin-Priority: 999
+
+Package: firmware-ralink
+Pin: release o=Debian,a=unstable
+Pin-Priority: 999
+
+Package: firmware-realtek
+Pin: release o=Debian,a=unstable
+Pin-Priority: 999
+
+Package: zd1211-firmware
+Pin: release o=Debian,a=unstable
+Pin-Priority: 999
+
 Package: initramfs-tools
 Pin: release o=Debian,a=unstable
 Pin-Priority: 999

config/chroot_sources/sid.chroot

-deb http://ftp.us.debian.org/debian/ unstable main
+deb http://ftp.us.debian.org/debian/ unstable main non-free