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Windows 7: Switching my desktop lamp wakens the computer!

13 Jan 2016   #1
Stevekir

Windows 7 Home Premium 64bit
 
 
Switching my desktop lamp wakens the computer!

The computer is sleeping. I switch on my nearby desktop lamp (11 W fluorescent fed by its own transformer), and the computer wakes up 80% of each time the lamp is switch on! This has suddenly started a few days ago. The 230 V plugs for the computer and the lamp are not near each other mains-wise (for example, they are not plugged into the same extension strip). I didn't do anything at all to either item around the time the behaviour started.

Its not a disaster, but it is odd. Any ideas?


My System SpecsSystem Spec
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13 Jan 2016   #2
maxseven

Windows 7 Home Premium 64bit 6.1 Build 7601 (SP1)
 
 

Only thing that comes to mind is if you have an optical mouse and the fluorescent light somehow wakes it. Did you get a shiny new mousepad maybe? Put the mouse in a drawer or throw something over it and see if that works.

What does this cmd.exe say about why the PC woke?

powercfg -lastwake
My System SpecsSystem Spec
13 Jan 2016   #3
Stevekir

Windows 7 Home Premium 64bit
 
 

Quote   Quote: Originally Posted by maxseven View Post
Only thing that comes to mind is if you have an optical mouse and the fluorescent light somehow wakes it. Did you get a shiny new mousepad maybe? Put the mouse in a drawer or throw something over it and see if that works.

What does this cmd.exe say about why the PC woke?

powercfg -lastwake
Thanks. An optical mouse but no mousepad. Nothing new added. Attached gives reply to powercfg -lastwake

I will now cover mmouse and see if the comp. wakens
My System SpecsSystem Spec
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13 Jan 2016   #4
maxseven

Windows 7 Home Premium 64bit 6.1 Build 7601 (SP1)
 
 

Quote   Quote: Originally Posted by Stevekir View Post
Attached gives reply to powercfg -lastwake
And the result was...what?

Another thought might be if the act of switching on the desktop lamp causes vibration to excite the mouse. I have had mice that were very sensitive to any sort of bumping for example.

But unless you recently changed the mouse attributes to e.g. assert a higher resolution or different movement setting I dunno why it would change by itself.
My System SpecsSystem Spec
13 Jan 2016   #5
Stevekir

Windows 7 Home Premium 64bit
 
 

Quote   Quote: Originally Posted by Stevekir View Post
Thanks. An optical mouse but no mousepad. Nothing new added. Attached gives reply to powercfg -lastwake

I will now cover my mouse and see if the comp. wakens
I covered the mouse completely. I also completely wrapped the lamp in a blanket ans switched it on. The comp. woke!

I conclude that there must be some interference caused by the switching on (and once, switching off) of the light via the mains, but why it started without any changes in my system is a mystery. Or perhaps electromagnetic waves from the light can travel through blankets. Perhaps they can, in which case I will need to wrap the light in al.foil. I will do that and report. But then, aluminium is not magnetic. Jeez! I'll look for a metal box. Even my garden barrow is plastic. Biscuits come in paper wrappers, not tins big enough.
My System SpecsSystem Spec
13 Jan 2016   #6
Stevekir

Windows 7 Home Premium 64bit
 
 

Quote   Quote: Originally Posted by maxseven View Post
Quote   Quote: Originally Posted by Stevekir View Post
Attached gives reply to powercfg -lastwake
And the result was...what?

Another thought might be if the act of switching on the desktop lamp causes vibration to excite the mouse. I have had mice that were very sensitive to any sort of bumping for example.

But unless you recently changed the mouse attributes to e.g. assert a higher resolution or different movement setting I dunno why it would change by itself.
I have been careful not to cause any mechanical vibrations to disturb the mouse. Perhaps my next step is to lift the lamp in the air in case vibrations are travelling through the desks to the mouse.

I will unplug the mouse at the back of the case, which will eliminate the mouse as the source of the problem. (But there's an interesting TV program coming on...)
My System SpecsSystem Spec
13 Jan 2016   #7
Stevekir

Windows 7 Home Premium 64bit
 
 

Quote   Quote: Originally Posted by Stevekir View Post

I have been careful not to cause any mechanical vibrations to disturb the mouse. Perhaps my next step is to lift the lamp in the air in case vibrations are travelling through the desks to the mouse.

I will unplug the mouse at the back of the case, which will eliminate the mouse as the source of the problem. (But there's an interesting TV program coming on...)
I unplugged the mouse, and the comp. woke up when the light was switched on. So I think the mouse is not implicated. Perhaps if I bought a 230 V power strip with surge protection, like:

Belkin 4-Way Economy Surge Protector, 1m Cable: Amazon.co.uk: Computers & Accessories

I will ring Belkin in the morning for advice.
My System SpecsSystem Spec
13 Jan 2016   #8
maxseven

Windows 7 Home Premium 64bit 6.1 Build 7601 (SP1)
 
 

Again, powercfg -lastwake should help you with at least what Windows thinks is waking it.

If the problem turns-out to be electrical interference from the lamp, that it's acted-up only recently could owe to a failing ballast in the lamp, or I suppose a deterioration of the light bulb itself. Replacing one or both of those might fix the problem.
My System SpecsSystem Spec
13 Jan 2016   #9
Stevekir

Windows 7 Home Premium 64bit
 
 

Quote   Quote: Originally Posted by maxseven View Post
Again, powercfg -lastwake should help you with at least what Windows thinks is waking it.

If the problem turns-out to be electrical interference from the lamp, that it's acted-up only recently could owe to a failing ballast in the lamp, or I suppose a deterioration of the light bulb itself. Replacing one or both of those might fix the problem.
I tried powercfg. The attachment shows the result.

I will also pursue the lamp as the problem. It is only a year old. Thanks.


Attached Images
Switching my desktop lamp wakens the computer!-powercfg-lastwake.jpg 
My System SpecsSystem Spec
13 Jan 2016   #10
AddRAM

Windows 7 Pro x64 Windows 10 Pro x64
 
 

It`s the vibration, move the lamp across the room, try it again.
My System SpecsSystem Spec
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 Switching my desktop lamp wakens the computer!




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