Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




Mr Snotty
8072 posts

Uber Geek
+1 received by user: 4049

Moderator
Trusted
Lifetime subscriber

Topic # 166097 2-Mar-2015 19:57
Send private message

Not quite sure what is causing this but the laptop is an Alienware 14 (thanks BigPipe!) and the switch is a Netgear 16pt Prosafe Gigabit Switch sitting in the comms room (image here), anyone have any ideas why my touchpad stops working? I've also noticed that sometimes my touchpad goes a little crazy when it is hooked up to normal AC power indicating maybe an earthing issue in the house?



I've replaced the power cable on my switch thinking it was potentially not earthed but appears it is. If I plug it directly into my router the issue is still there but on a far less extreme level.




Create new topic


Mr Snotty
8072 posts

Uber Geek
+1 received by user: 4049

Moderator
Trusted
Lifetime subscriber

  Reply # 1249763 2-Mar-2015 20:13
Send private message

Hmm and thinking that the laptop power supply will act as another return to earth:





'That VDSL Cat'
9053 posts

Uber Geek
+1 received by user: 1992

Trusted
Spark
Subscriber

  Reply # 1249774 2-Mar-2015 20:20
Send private message

Interesting.

While i have as much of an idea of what it could be as you, I have seen odd things happening with dodgy switches too.

With my issue, i found my TPLink switch affecting the modem, causing high CRC and FEC error rates.


Never noticed it causing issues with other devices in the house however.




#include <std_disclaimer>

 

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.


 
 
 
 




Mr Snotty
8072 posts

Uber Geek
+1 received by user: 4049

Moderator
Trusted
Lifetime subscriber

  Reply # 1249780 2-Mar-2015 20:25
Send private message

hio77: Interesting.

While i have as much of an idea of what it could be as you, I have seen odd things happening with dodgy switches too.

With my issue, i found my TPLink switch affecting the modem, causing high CRC and FEC error rates.


Never noticed it causing issues with other devices in the house however.


I can get 1gbit straight to my Microserver over the switch so am pretty sure it is not due to anything on the Ethernet layer, I think it is electrical causing it but don't really want to replace the switch unless if I know that is what is causing it. My thoughts are dodgy earth in the house however I don't have any real way of testing this to be sure.

When picking up the laptop it corrects itself? I am now really really confused (the bottom is mostly an aluminium fan grill and I am sitting on the floor so earth?) :





3250 posts

Uber Geek
+1 received by user: 1269

Subscriber

  Reply # 1249925 2-Mar-2015 23:03
One person supports this post
Send private message

Plug both the laptop and the network switch into 1 powerboard at the same time. Does this fix the problem? Also try taking the laptop and network switch to a friends house and try them there. If either thing fixes it then you have an earthing problem in your house.

The issue you are having is most likely caused by high frequency interference running through your power and network cables in your house. Due to a possible earth problem. Also are using genuine power supplies to run the laptop and network switch? As counterfeit ones often lack the required interference filtering circuits. (as well as often being dangerous).







Mr Snotty
8072 posts

Uber Geek
+1 received by user: 4049

Moderator
Trusted
Lifetime subscriber

  Reply # 1249958 3-Mar-2015 00:06
Send private message

Aredwood: Plug both the laptop and the network switch into 1 powerboard at the same time. Does this fix the problem? Also try taking the laptop and network switch to a friends house and try them there. If either thing fixes it then you have an earthing problem in your house.

The issue you are having is most likely caused by high frequency interference running through your power and network cables in your house. Due to a possible earth problem. Also are using genuine power supplies to run the laptop and network switch? As counterfeit ones often lack the required interference filtering circuits. (as well as often being dangerous).


Perfect just what I thought.

So far I've tested:
1) Laptop direct into Switch - causes issues.
2) Laptop into WRT1900AC Router - causes issues.
3) Laptop into WRT1900AC Router + disconnected from Switch - less issues but still noticeably there.
4) Laptop PSU connected to same circuit as network equipment - less issues but still noticeably there.

The switch is powered by an internal PSU connected by an IEC cable, router is powered by what came with it. I've tried disconnecting everything from it and didn't make any changes.

Laptop on battery - totally fine, laptop on PSU (most of the time) has some faults but when laptop is on lap (grounded to a degree) it is fine.

So, appears to be an earthing problem. Looking around the property I can't seem to find a ground pin to check (normally this seems to be beside the fuse box), it is a newish building built in 2005 so I would have thought it would have been there, any ideas how I could troubleshoot this?



Cheers.




3250 posts

Uber Geek
+1 received by user: 1269

Subscriber

  Reply # 1250653 3-Mar-2015 23:31
Send private message

Have you done the tests I have said yet? As the "plug everything into the same powerboard at the same time" test is to at least link the earth pins of all devices together. Even if they are still not linked to the mass of earth.





21607 posts

Uber Geek
+1 received by user: 4429

Trusted
Subscriber

  Reply # 1250876 4-Mar-2015 11:16
Send private message

I have had issues with my dell laptops with their crap touchpad (not the synaptics one) come right by placing my hand flat on the touchpad covering it all for a few seconds. Seems to make it recalibrate or something and then its right for a while.

Is the laptop PSU a 2 or 3 pin plug? If its 2, then no earth at all, and there may be something happening to earth it out thru ethernet via the suspression capacitors that are between the isolated side and the computers chassis.




Richard rich.ms



Mr Snotty
8072 posts

Uber Geek
+1 received by user: 4049

Moderator
Trusted
Lifetime subscriber

  Reply # 1252547 6-Mar-2015 22:52
Send private message

Yep done the tests with the power adapter plugged into the same multiboard the switch / networking equipment is plugged into, same result.

I've checked the external earth and used a Multimeter to check the connection from that to the earth pin on the switch etc and found them to be connected, so they're earthed. My guess is some High Frequency voltage (or something) is getting into the laptop causing it to freak out. I just tested this with my partners laptop and getting the same except not as extreme.

richms: I have had issues with my dell laptops with their crap touchpad (not the synaptics one) come right by placing my hand flat on the touchpad covering it all for a few seconds. Seems to make it recalibrate or something and then its right for a while.

Is the laptop PSU a 2 or 3 pin plug? If its 2, then no earth at all, and there may be something happening to earth it out thru ethernet via the suspression capacitors that are between the isolated side and the computers chassis.


The Laptop PSU is a 3 pin plug - will need to try the hand flat trick, cheers for that!




Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.