Solved

Turnoff the screen backlight without letting the device to go into sleep in Windows 8

Posted on 2014-10-03
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Last Modified: 2016-06-14
Hi,
is there any way to turnoff screen backlight without letting the device to go into sleep in Windows 8? I have Lenovo ThinkPad 10 20C1 - 10.1", I don't need backlight, because I will connect to it via RDP and device will be put out of reach.
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Question by:SamuelPallari
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Expert Comment

by:helpfinder
ID: 40359042
go ro control panel > power options > Choose what closing the lid does (on the left side) and set Nothing for closing the lid
screenshot
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Author Comment

by:SamuelPallari
ID: 40359060
it doesn't work. then  display turns off, it goes to sleep. I need, that backlight have to be turned off but I could work with device via RDP.
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Expert Comment

by:helpfinder
ID: 40359069
if you set to do Nothing when close a lid then display backlight does black when you close the lid but computer is still running. Set that action for laptop running on battery and plugged in as well.
I have right now set like that (laptop running with closed lid connected to external display) and it works perfectly
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Author Comment

by:SamuelPallari
ID: 40359142
it is tablet, it does not have lid.
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Expert Comment

by:helpfinder
ID: 40359156
sorry, I thought you have laptop - my bad.
then try in power plan to set to go to sleep after let say 1 minute but standby or hibernation set to Never.
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LVL 53

Expert Comment

by:McKnife
ID: 40359183
Simply look at the power options. Turn off display after x minutes is configurable.
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Author Comment

by:SamuelPallari
ID: 40359261
tab
as you see when I change in advanced settings turn off display after x min, also changes automaticly in plan settings Put the computer to sleep: x min.  and vice versa. I tried to create the program with C#:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace OnOffMonitor
{
    class Program
    {

        [DllImport("user32.dll")]
        static extern IntPtr SendMessage(int hWnd, int Msg, int wParam, int lParam);

        enum MonitorState
        {
            ON = -1,
            OFF = 2,
            STANDBY = 1
        }
        static void Main (string[] args)
        {
           
            SetMonitorState(MonitorState.OFF);
            
        }
       static private void SetMonitorState(MonitorState state)
        {
            SendMessage(0xFFFF, 0x112, 0xF170, (int)state);
        } 
    }
}

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but it goes to sleep too. I tried with nircmd (http://www.nirsoft.net/utils/nircmd.html) and it is the same problem.
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Expert Comment

by:McKnife
ID: 40359268
Interesting. Normal computers and laptops would NOT keep those in sync. I wonder why your tablet would. Could it be that there's some 3rd party power management software in use? If so, uninstal t for a test. That could also mean some power saving software from your tablet's maker.
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Author Comment

by:SamuelPallari
ID: 40359419
maybe it is possible to write some kind of script, what turns off backlight?
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LVL 53

Expert Comment

by:McKnife
ID: 40359436
Did you do as suggested and checked for power management software? Feedback is important... :)

About the script: you already mentioned nircmd - what did you do with it? If nircmd cannot do it, no one can :)
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Accepted Solution

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SamuelPallari earned 0 total points
ID: 40365786
I figure out, that device goes to sleep when display turns off because Tablet  has Intel Atom CPU Z3795 processor.

"When the display is turned off on connected standby capable systems, all running software (including applications and operating system software) become subject to a new set of activity restrictions. Windows Desktop Activity Moderator (DAM) suppresses legacy app execution in a manner similar to the Sleep state. It does this by suspending all applications in the user session and throttling all 3rd party services to create predictable power usage over the period of idle time. This enables systems that support connected standby to deliver minimized resource usage and long, consistent battery life while enabling Windows 8 Modern UI apps to deliver the connected experiences they promise. In addition, as hardware power states become more sensitive, software services must be well behaved at connected standby so they don’t needlessly wake/throttle the system, which would limit battery life."

So, it is not about 3rd part power management software, it is that device has connected standby enabled. Can it be done, to disable it?
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