Ubuntu 16.04: restore screen refresh rate after suspend/resume - Ask Ubuntu

even after googling, cannot find answer maybe easy question. 1 of computers connected home main tv dp/hdmi cable. works fine. screen resolution detected right way, 1920x1080, if refresh rate set 50hz (50 hz interlaced). can run xrandr -r 60 , display nice 1920x1080@60hz desktop. (60 hz progressive).

however, when stop using computer while, automatically goes sleep and, when wake up, resolution set bad 50 hz interlaced refresh rate.

i added 15_screen-resume script in /etc/pm/sleep.d follow :

#!/bin/sh  case "$1" in     resume)         xrandr -r 60         date > /tmp/resume.txt     ;; esac 

i can check if script ran date > /tmp/resume.txt command. know works if run pm-suspend shell, wait computer sleep , wake up. script not called if computer enters sleep mode on own after period of inactivity.

question is: how call custom script @ wake after computer running ubuntu 16.04 entered sleep mode after period of inactivity?

thanks help.

it can confusing many different ways can put computer sleep acpi, gnome's gsettings, pm-utils, power management (or that) , systemd.

in case need create script in /lib/systemd/system-sleep looks this:

#!/bin/sh  case $1/$2 in   pre/*)     echo "going $2..."     # place pre suspend commands here, or `exit 0` if no pre suspend action required     exit 0     ;;   post/*)     echo "waking $2..."     # place post suspend (resume) commands here, or `exit 0` if no post suspend action required     sleep 2     xrandr -r 60     date > /tmp/resume.txt     ;; esac 

to ensure script created right permissions, copy , existing script , edit it:

cd /lib/systemd/system-sleep sudo cp wpasupplicant tv_refresh gksu gedit tv_refresh 

the sleep 2 pause may unnecessary setup necessary restoring sound laptop hdmi tv.

the echo lines optional handy because show in /var/log/syslog.