4

My external keyboard does not have a suspend button. Is there a way I can set up Ubuntu to use a different key (or any key for that matter) to wake the PC if it has been suspended?

Peter Mortensen
  • 854
Jack
  • 4,029

2 Answers2

7

If you run the following command, you will see a list of USB devices and if they are enabled to wake up the system.

cat /proc/acpi/wakeup

You will see a list of items such as the the one seen below.

USB0      S3    *disabled   pci:0000:00:12.0

Once you have established which device is the keyboard, let’s say USB0, run this command.

sudo su
echo USB0 > /proc/acpi/wakeup

Now, if you run the command from the start again, you should see enabled next to the device.

USB0      S3    *enabled   pci:0000:00:12.0

That worked for me, and I can wake up my desktop with any key.

Details on the wakeup codes for devices can be found here (link courtesy of Santhana Krishnan).

Peter Mortensen
  • 854
CoalaWeb
  • 3,227
0

Another thing that may need to be checked is /sys/bus/usb/devices/*/power/wakeup.

For example on my machine

[~]$ ls /sys/bus/usb/devices
1-0:1.0  1-1:1.0  2-1      2-1:1.1  2-3:1.0  2-7:1.0  2-8      2-8:1.1  usb1  usb3
1-1      2-0:1.0  2-1:1.0  2-3      2-7      2-7:1.1  2-8:1.0  3-0:1.0  usb2

This lists the devices. To view which folder name (? what is this called) correspond to which device you can

[devices]$ lsusb
...
Bus 002 Device 023: ID feed:abcd Andrew Hess starboard
...

which appears to correspond to

[~]$ cat /sys/bus/usb/devices/2-1/idVendor 
feed
[~]$ cat /sys/bus/usb/devices/2-1/idProduct 
abcd
[~]$ cat /sys/bus/usb/devices/2-1/manufacturer
Andrew Hess
[~]$ cat /sys/bus/usb/devices/2-1/product
starboard

then you need to check

[~]$ cat /sys/bus/usb/devices/2-1/power/wakeup
enabled

Another possible cause is the firmware of your keyboard has a bug. See for example https://github.com/qmk/qmk_firmware/issues/19663 . In any case try to upgrade to latest version.

user202729
  • 151