Wake Up Refreshed: Bind A Key To Your Sleep

Many users want to wake up their computers from sleep mode by pressing any key or a specific key combination. However, some prefer to use a key sequence to avoid accidental wake-ups due to mouse movements or single keypresses. While some older BIOS versions allowed users to select the resume trigger, modern systems typically wake up in response to any input. Disabling certain devices from being able to wake up the computer may be possible through the BIOS settings or by using specific firmware.

Binding a key to wake up a computer from sleep

Some computers may require a specific key to wake up from sleep mode

Waking up a computer from sleep mode can be done in several ways. Moving the mouse or pressing any key on the keyboard are the most common methods. However, some computers may require a specific key to wake up from sleep mode. This is usually due to the computer's settings or the operating system configuration.

For example, on Windows, the Device Manager includes an option to enable the keyboard to wake up the PC. If this option is not enabled, the computer may require the power button to be pressed to wake up. Additionally, certain laptops, such as the Dell Latitude 7490, may have specific BIOS settings related to wake-up behaviour, such as "USB Wake Support" and "Wake on LAN".

To ensure that a specific key or button is able to wake up the computer from sleep mode, users should check and configure their power settings. This can be done by going to Start > Settings > System > Power & Battery > Screen and Sleep, where users can adjust the time duration before the computer enters sleep mode and select the power mode to optimise performance or power efficiency.

In some cases, the problem may lie with the keyboard itself. To check this, users can open the Start menu, search for "Device Manager," and find "Keyboards" in the list of devices. From there, they can enable the option "Allow this device to wake the computer." This ensures that the keyboard is capable of sending a wake signal to the computer when a key is pressed.

If a computer is not waking up from sleep mode as expected, it is recommended to try different keys or buttons, such as the power button, to see if they trigger the wake-up event. Additionally, updating the computer's drivers and operating system can also help resolve sleep-related issues.

You can enable the Allow this device to wake the computer setting

To enable the "Allow this device to wake the computer" setting, you must be signed in as an administrator. Here are the steps you can follow:

• Open an elevated command prompt by opening Windows Terminal (Admin) and selecting either Windows PowerShell or Command Prompt.
• Type the following command into the command prompt and press Enter: "powercfg -devicequery wake_from_any". This will display a list of all devices that can wake your computer from any sleep state.
• Identify the device you want to enable to wake the computer, such as a keyboard or mouse.
• Type the following command into the command prompt and press Enter: "powercfg -devicequery wake_programmable". This will show a list of all devices that are user-configurable to wake the computer.
• Double-click or tap on the specific device you want to enable.
• Click on the Power Management tab.
• Check (enable) the "Allow this device to wake the computer" box and click OK.

Additionally, you can try the following methods to enable the setting:

• Add the registry value.
• Run the Hardware and Device troubleshooter.
• Ensure Bluetooth is enabled and that the "Allow Bluetooth devices to find this PC" option is selected.
• Check your BIOS/UEFI power settings for a "Boot from keyboard" or similar setting.

For Windows, the BIOS may have a USB wake up option

If you're using a Windows PC, you may be able to wake it up from sleep by pressing any key. However, this doesn't seem to work for all Windows users, especially those using Windows 10, which seems to turn off USB devices when the computer goes to sleep.

If you're having trouble waking your Windows PC from sleep using a USB keyboard or mouse, you can try enabling "USB Wake Support" in the BIOS settings. Here's how to do it:

• Power off your laptop.
• Press and hold the "F2" key, then press the power button.
• In the BIOS settings, expand "Power Management" and then select "USB Wake Support."
• Enable "USB Wake Support" by clicking on it or checking "Enable."
• Save your changes and exit the BIOS.

Note that the key to access BIOS may vary depending on your hardware. In some cases, you may need to press the "Delete" key during boot up to enter the BIOS. Additionally, some computers may have different power management options in the BIOS, such as "Wake on LAN." Experimenting with these settings and enabling them could potentially help with wake-up issues.

For Ubuntu, you can disable waking via all input devices except a single keyboard

To disable waking via all input devices except a single keyboard on Ubuntu, you can follow these steps:

Identify the device parameters: Open a terminal window by pressing Ctrl+Alt+T and then run the following command to find out the key parameters for your device:

Udevadm info -q all -a /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0D:00/

Note that you may need to replace the bold text in the command according to your specific device configuration.

Create and edit a udev rule: Once you have identified the device parameters, you can create and edit a custom udev rule. Open a text editor with administrative privileges and navigate to the udev rules directory:

Sudo gnome-text-editor /etc/udev/rules.d/40-disable-wakeup-triggers.rules

Again, you may need to replace "gnome-text-editor" with an alternative text editor, such as "gedit" for older versions of GNOME, "musepad" for XFCE, or "nano" for other desktop environments.

Add the following line to the udev rule file, substituting your specific device parameters:

ACTION=="add", KERNEL=="[YOUR_KERNEL_PARAMETERS]", SUBSYSTEM=="acpi", DRIVER=="button", ATTR{power/wakeup}="disabled"

Apply the changes: After saving the file, run the following command to apply the changes:

Sudo udevadm trigger

Alternatively, you can simply restart your computer for the changes to take effect.

Verify the disabled wakeup triggers: To verify that the changes have taken effect, you can run the following command in the terminal:

Grep enabled

This will show you all the wakeup triggers that are either enabled or disabled.

Repeat for other devices: If you have multiple devices or PCIe cards, you may need to repeat the above steps for each device, ensuring that you use the correct device parameters and IDs in the udev rules.

By following these steps, you can disable waking via all input devices except a single keyboard on Ubuntu. Keep in mind that some devices, such as the power button, network card, and Thunderbolt 3 device, may still be able to wake up your system. Additionally, as noted in the sources, some users have suggested using the hibernate option instead of suspend to prevent accidental wake-ups.

You can remap keys using HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout

To bind a key to wake up your computer from sleep, you can remap your keyboard using the Windows Registry. This method involves editing the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout settings.

Firstly, it is important to back up your registry. To do this, open the Registry Editor and choose File > Export, then save the resulting file.

Next, navigate to the following path in the Registry Editor: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout. Here, you will find the "Scancode Map" entry, which is responsible for remapping keys.

To remap a key, you will need to modify the "Scancode Map" entry. The specific steps may vary depending on your version of Windows, but you will typically need to add a new value with the desired remapping. For example, to remap the Windows key to the Ctrl key, you would add the following value:

"Scancode Map"=hex:00,00,00,00,00,00,00,00,02,00,00,00,1d,e0,5c,e0,00,00,00,00

Once you have made the desired changes, restart your computer for the new key mappings to take effect.

It is important to note that editing the registry can be a complex and sensitive process. Always back up your registry before making any changes, and be cautious when modifying values to avoid unintended consequences. If you are unsure, consider using alternative methods, such as Microsoft PowerToys, which can be used for remapping keys without directly editing the registry.

Frequently asked questions