How To Disable USB Wake from Suspend?

Support & Help Requests
13

OK, so first a confession: I'm blundering mostly in darkness here and after delving beyond my depth into something like this it's easy to forget most of the details after a week or two. So I've tried to document what I'm doing in the two files just created. First, after imagining some comprehension of the Feb 10 at 9:03 post by cipricus here, I created this file:

sudo nano .toggleWakeFromSuspendInBoot.sh

 # This file contains the device name(s) of anything you want Disabled or Enabled,
 # for waking the PC from Suspend. For example, if your PC wakes from Suspend any
 # time you touch the mouse you can put that device name in the line below. To get
 # get a list of device names, copy and paste this line into in the Terminal app:
 #   cat /sys/bus/usb/devices/1-8/power/wakeup
 # Any line with the word "enabled" contains the name of a device that will wake
 # your PC from Suspend. For example, this line on a Dell PC running Ubuntu Mate
 # 20.04.1 indicates the current wake from Suspend status of both the USB keyboard
 # and a bluetooth mouse plugged into a different USB port:
 #   XHC  S0  *enabled  pci:0000:00:14.0
 # Note that this status is unaffected by the BIOS setting chosen by the user, for
 # selecting whether USB devices will wake the PC from Suspend. This status may be
 # toggled between enabled and disabled with this line in the Terminal app (for
 # the XHC device in this example):
 #   sudo sh -c "echo XHC > /proc/acpi/wakeup"
 # After testing to ensure this is the device that prevents waking from Suspend as
 # desired when toggled to "disabled" status, the following line was added without
 # the hashtag start on every line in this description. This way the line is sent 
 # to the PC at every Startup or Restart, thus disabling the USB keyboard and 
 # mouse from waking the PC. More such lines may be added, to enable or disable
 # any other devices in the "cat /sys/bus/usb/devices/1-8/power/wakeup" list.
 # Note that this file is sent to the PC at Startup by the file named:
 #   /etc/systemd/system/wakeup-events.service

echo XHC > /proc/acpi/wakeup

My hope is that since I sometimes turn on dot files in Nemo when rummaging around my Home directory, this might help a forgetful future self by occasionally seeing the file or finding it via a Nemo (aka Files) search for "wake" as I've done during initial struggle with this issue. Since my PC is single user, you may want a different location. Anyway, I then created the file to call that one based on minimal understanding of cipricus' excellent post:

sudo nano /etc/systemd/system/wakeup-events.service

  [Unit]
  Description=Run script toggling wake from Suspend devices during system start

  [Service]
  Type=oneshot
  ExecStart=/bin/bash ~/.toggleWakeFromSuspendInBoot.sh

  [Install]
  WantedBy=multi-user.target

Now I'm going to test all this and report back... :crossed_fingers: