After disabling in my Dell screen MST support (DP 1.2 disabled), did a firmware upgrade from the following link https://01.org/linuxgraphics/downloads/skylake-dmc-1.26 and applying the kernel images located in http://koti.kapsi.fi/~tjaalton/skl/mst ,now system works fine. I had no freezes and I was able to suspend / resume the system without issues.
Images used (linux-image-4.4.0-23-generic_4.4.0-23.40~bpo1_amd64.deb and linux-image-extra-4.4.0-23-generic_4.4.0-23.40~bpo1_amd64.deb)
After disabling in my Dell screen MST support (DP 1.2 disabled), did a firmware upgrade from the following link https:/ /01.org/ linuxgraphics/ downloads/ skylake- dmc-1.26 and applying the kernel images located in http:// koti.kapsi. fi/~tjaalton/ skl/mst ,now system works fine. I had no freezes and I was able to suspend / resume the system without issues.
Images used (linux- image-4. 4.0-23- generic_ 4.4.0-23. 40~bpo1_ amd64.deb and linux-image- extra-4. 4.0-23- generic_ 4.4.0-23. 40~bpo1_ amd64.deb)