switch_display-linux-28d6

#!/bin/sh -e

# because of recent problems 2017-03-15 when calling this script after wakeup
# from suspend I add some logging to pin down which part exactly could cause a
# kernel panic

additional_log_arg="$*"
logfile="${logfile:-"$HOME/switch_display.log"}"

log() {
    true
    # strange, last time I could not reproduce the problem in boo#1029634 with
    # kernel-4.4.62-5.g2c1de65-default, even not in my "full setup" with
    # starting all applications. Maybe the reason was the following writing to
    # logfiles and sync being enabled which gives enough time for the
    # individual xrandr calls to "cool down" between each call? Disabled to
    # crosscheck again if it happens.
    # No, didn't happen. Maybe the problem is really gone for good
    echo "$(date +%F-%H-%M-%S): $0: $* $additional_log_arg" >> ${logfile}
    sync
}

# When the external monitor at the docking station was connected the last time
# we used the computer it would stay off (sometimes) unless we explicitly
# disable it once and re-enable it so we switch to the configuration of only
# one screen and then back to the 'auto' configuration

log "before, switching external off"
xrandr --output eDP1 --primary --auto --output DP1-1 --off --output DP1-2 --off --output HDMI1 --off --output DP-5 --off

#(sleep 2 ; sudo chvt 1) &

log "switching eDP1 on"
# --> this is most likely where it fails with boo#1029634 or the follow on bug
xrandr --output eDP-1 --primary --auto --output DP-1-3 --auto --above eDP-1 --output DP-1 --auto --above eDP-1 --output eDP1 --primary --auto --output DP1-1 --crtc 1 --auto --left-of DP1-2 --output DP1-2 --crtc 2 --auto --left-of eDP1 --output HDMI1 --auto --above eDP1 --above eDP-1 --output DP-5 --auto --right-of eDP1 --right-of eDP-1 --output DP-6 --auto --right-of eDP1 --right-of eDP-1 --output DP-7 --auto --right-of eDP1 --right-of eDP-1 --output DP-3 --auto --left-of eDP-1

log "after xrandr, before kill redundant nm instances"

# workaround: nm-applet seems to be spawned on each new display that is added
# but only shown on one screen so this does not help. Killing all superfluous
# instances
redundant_nm_instance_pids=$(pgrep -f nm-applet | tail -n +2)
if [ "$redundant_nm_instance_pids" != "" ]; then
    kill $redundant_nm_instance_pids
fi

log "done"