I think I checked the wrong kernel version. home:tiwai:test:bnc1029634-2 has 4.4.56-1.g9036908-default checked again: * boot to system * log into LXDE * change to tty1 * log in as root * systemctl suspend * disconnect DP1 * wakeup * reconnect DP1 * wait for kernel panic 4.4.56-1.g9036908-default works, PASSED