@Alex Hung (alexhung) Thank you for the temporary tweak.
After disabling XHC as wakeup, ALS is not waking up the suspended Ubuntu.
But, there should be some fine way to stop only ALS from wakeup rather than the
XHC (USB 3.1 controller) whole.
I think this seems to be a bug.
Fo the moment I did this -
1. Create a script file wherever you wish. Ex: `~/Scripts/disable-
devices-as-wakeup.sh`.
```bash
#!/bin/bash
declare -a devices=("XHC") # <-- Add your entries here
for device in "${devices[@]}"; do
if grep -qw ^$device.*enabled /proc/acpi/wakeup; then
sudo sh -c "echo $device > /proc/acpi/wakeup"
fi
done
```
2. Test it by executing it from the terminal.
3. If everything is okay then let's make a service.
`touch ~/Scripts/disable-devices-as-wakeup.service`
`chmod u+x ~/Scripts/disable-devices-as-wakeup.service`
~/Scripts/disable-devices-as-wakeup.service -
```bash
[Unit]
Description=Disable devices as wakeup
[Service]
ExecStart=/home/username/Scripts/disable-devices-as-wakeup.sh
Type=oneshot
[Install]
WantedBy=multi-user.target
```
4. Copy paste or move the service to `/etc/systemd/system/`.
`sudo cp ~/Scripts/disable-devices-as-wakeup.service
/etc/systemd/system/`
5. Enable the service.
`systemctl enable disable-devices-as-wakeup.service`
6. Restart the OS and check the status.
`systemctl status disable-devices-as-wakeup.service`
Detailed explanation found on https://access.redhat.com/documentation
/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/chap-
managing_services_with_systemd
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https://bugs.launchpad.net/bugs/1915264
Title:
ALS (Ambient Light Sensor) wakes up the suspended Ubuntu
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