Is there a way to turn off the display in Windows (7), preferably without using additional software?
Powershell script works fine, but leaves command-line window after turning on the display.
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On a laptop you can use the keyboard shortcut combination of Fn+F7 (F7 might differ depending on the laptop model) and for a desktop you can always use the power button.
Do you need any other specifications such as wake up on mouse movement or something else?
You can always create a shortcut and assign a keyboard shortcut to a black screensaver, use this path:
This will not turn off you screen but make it completely black
You can use WinAPI call
SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, 2) where
HWND_BROADCAST = 0xFFFF,
WM_SYSCOMMAND = 0x0112 and
SC_MONITORPOWER = 0xF170. The
2 means the display is being shut off.
There are several ways to make the call:
Separate executable. You can fire it through a script, command line, Run window, shortcut (
*.lnk), etc. Note that shortcuts can be invoked using a keyboard shortcut. The executable may be written in C or C++, or via P/Invoke in .NET languages (C# or PowerShell), or in many other languages that have a foreign language interface (e.g. JNI in Java).
AutoHotkey script. For a non-programmer, this way is probably simpler. Making customizations still requires some scripting. This script turns monitor off on Win + M:
#m:: Sleep 1000 SendMessage, 0x112, 0xF170, 2,, Program Manager return
Note the timeout before the
SendMessage call in the AutoHotkey script. It gives the user a chance to release keys (in case their release would wake up the monitor again). Do not forget about it even when making the call from a script in another language.
For more info, see the documentation of
WM_SYSCOMMAND message and AutoHotkey
SendMessage. It might be of interest that since Windows 8, using the same method to turn monitor on does not work, but there is a work-around.
As one-liner for instance using Win+R:
powershell -command $obj = Add-Type -MemberDefinition '[DllImport(""""user32.dll"""")] public static extern int SendMessage(int hWnd, int hMsg, int wParam, int lParam);' -Name fn -Namespace ns -PassThru; $obj::SendMessage(0xffff, 0x0112, 0xF170, 2)
It's not possible to put in a shortcut .lnk file unfortunately because the line is too long, I run it with Flow Launcher and my Favorites Plugin, this supports long command lines.
Based on Ujjwal Singh's answer, here is a Python script to do so:
# pip install pywin32 from win32api import SendMessage SendMessage( # https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-sendmessage?redirectedfrom=MSDN#parameters 0xFFFF, # HWND_BROADCAST # https://docs.microsoft.com/en-us/windows/win32/menurc/wm-syscommand 0x0112, # WM_SYSCOMMAND 0xF170, # SC_MONITORPOWER 2, # the display is being shut off )
Or if you prefer a one-liner to run directly from cmd prompt:
$ python -c "import win32api; win32api.SendMessage(0xFFFF, 0x0112, 0xF170, 2)"