Ubuntu – How to run a script when suspending/resuming? – Sony VAIO Ubuntu 12.04

12.04etcsuspend

Question: How to assign a script to run when selecting the suspend option on the power menu?

Context:
I have a Sony VAIO laptop with an AMD Radeon graphics card. I would like to be able to disable/enable the discrete graphics card. I have no problem in doing this but it causes problems when suspending & resuming from suspend.

When the session is resumed from suspend (with the discrete DPU disabled), the fan will spin up uncontrollably, what I would like to do is edit the suspend script or assign a new script to the suspend option on the power menu. This is so I can re-enable the GPU before suspending.

EDIT:
After some research I think it has something to do with the files in /etc/pm/sleep.d/?

If I put a custom script in there would it be run when suspending and resuming from suspend?

How do I differentiate in the script between suspending/resuming?

Best Answer

You are right. You have to write a script and save it to /lib/systemd/system-sleep/ (since 2015 systemd take care of that, before was /etc/pm/sleep.d/). The difference between suspending and resuming is given as a parameter to the script:

#!/bin/bash

case "$1" in
    suspend)
        # executed on suspend
        ;;
    resume) 
        # executed on resume
        ;;
    *)
        ;;
esac

If you also want to do it for hibernate, the arguments would be hibernate and thaw.

Related Solutions

Ubuntu – How to disable the lock screen when resuming from suspend or hibernate without losing ability to lock screen manually

In 12.04 the option to turn off the screen lock does not remove the option to lock the screen from the power/cog button.

Click the power/cog button in upper right
Go to system settings
Click on Brightness and Lock
Slide the slider for Lock to off

All done!

Ubuntu – How to get a script to always run on resume in Lubuntu

The fact that the log contained /etc/pm/sleep.d/reset_panel resume suspend: Cant connect to display: indicates that no display is set, and you are trying to run a graphical program. When you're running pm-suspend from your session, the correct display was set probably by LightDM or whatever your display manager is. When it gets run automatically on resume, I assume it's getting run as the root user and not attached to a display. So you need to set the display variable yourself, like so:

#!/bin/bash
case "$1" in
   suspend|hibernate)
      #do nothing
   ;;
   resume|thaw)
      export DISPLAY=:0
      sleep 5 && lxpanelctl restart & #Delayed so the battery icon can finish wrecking shop.
   ;;
   *)
      exit 1
   ;;
esac
exit 0

The only draw back is that this won't work if you display isn't actually :0 That's the default, but it could change particularly in a multi-user setting.

Best Answer

Related Solutions

Ubuntu – How to disable the lock screen when resuming from suspend or hibernate without losing ability to lock screen manually

Ubuntu – How to get a script to always run on resume in Lubuntu

Related Question