systemd sleep + xrandr

On 02/09/2017 08:45 PM, Akkana Peck wrote:

> I wrote that script so that if I dock or undock my Lenovo X201,
> it would automatically figure out whether it was docked with a
> monitor connected, and display to the monitor rather than the laptop
> screen. But I have yet to find a way to run anything automatically
> upon resuming from suspend. Years ago, you could put wakeup scripts
> in /etc/pm/sleep.d, but those aren't called reliably any more; I've
> tried the systemd equivalent and several other methods I can't
> remember any more, and finally gave up and just call it manually
> if the screen is blank after docking or undocking.

https://www.freedesktop.org/software/systemd/man/systemd-suspend.service.html

BTW I did some experiment with a handmade service

/etc/systemd/syste/wakemeup.service
[Unit]
Description=Run user script after suspend
After=suspend.target hibernate.target hybrid-sleep.target graphical.target
# not sure if graphical.target is a good idea, I did't do all homeworks

[Service]
User=[youruser]
#^^^^ IMPORTANT
Type=oneshot
Environment=DISPLAY=:0
#^^^^ IMPORTANT
ExecStart=/usr/local/bin/wakemeup
StandardOutput=syslog

[Install]
WantedBy=suspend.target hibernate.target hybrid-sleep.target


/usr/local/bin/wakemeup
#!/bin/sh
# ^^^^ IMPORTANT
xrandr >> /tmp/gino
echo $(date) >> /tmp/gino

This works.

It could be improved:
- running as root
- checking users and active display: w -oush
- define a criteria about which user/display "prefer"
- run xrandr -d [display] with the appropriate user

-- 
Ivan Sergio Borgonovo
http://www.webthatworks.it http://www.borgonovo.net