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I have HP pavilion 2200 series laptop with AMD processor, 1GB RAM, on board nvidia display card. It suddenly cause following problem:

When the adapter is unplugged, the touchpad works correctly and smoothly. But as soon as it is connected, the cursor response badly but when i use external usb mouse, It works fine.

I have check somewhat same question here, It tell me that it is somewhat regarding power supply issue, but it is little different then this one.

I have my original adapter but few days before i have given it to vendor for service due to slow speed Blue Screen issue with OS.

Does anyone know that how to troubleshoot this????

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1  
Honestly, this sounds like a design flaw from HP. You should probably bring it to them. –  TheCompWiz Dec 14 '11 at 17:15
    
what is wrong in the question to down vote??? the behavior of hardware is different so i asked this.. if someone faced then explain little about this.. why this happen?? not every HP laptop have such problem i am this stuff since last 7 years.. –  Niranjan Kala Dec 14 '11 at 17:29
    
@NiranjanKala: I'm guessing that this is some sort of grounding issue. If possible I would try different power outlets and / or a different power adapter. Also try moving the adapter further away from the laptop in case there is electromagnetic interference. –  James Dec 14 '11 at 17:42
    
I just bought a new adaptor and had same problem. But only in my bedroom and not in living room. Then I realised my new adaptor is 3 pin, my old was 2 pin, so it IS a grounding issue. AND the reason it was working fine in my living room was because I was plugging the adaptor into a BELKIN surge protector, not the main plug socket. As soon as I did the same in my bedroom the problem went away. SO the simplest solution appears to be the cheapest and easiest. Just isolate the ground on the adaptor by plugging into a surge protector. –  user214940 Apr 7 '13 at 15:25

6 Answers 6

up vote 3 down vote accepted

Sometimes in windows when you plug the power in, it changes the battery/perfomance mode to MINIMAL PORTABLE/LAPTOP, check that it does not do that.

enter image description here

In Control Panel double click Power Options. Here you can set timeouts for your monitor, system standby, and hibernate. Notebook computer users can specify an alternative power scheme that will take effect when the PC is running on battery power.

Another problem can be the system driver, make sure you have the original HP driver installed.. Usually the mouse pad from HP use the Synaptics Drivers, and that should reflect in the device manager.

enter image description here

If the problem persists it is most likely going to be hardware related, by the sounds of things this is an old notebook, and could just have some fault components.. Sorry.

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i will try this and let you know.. well thanks for response. –  Niranjan Kala Dec 14 '11 at 17:40

I have an HP Pavilion g6 and I have the exact same issue. As others have mentioned it appears to be some sort of grounding issue. I am using the original HP power supply.

Issue: touch pad skips when plugged in.

Work arounds:

  • Touch metal on one of the connectors (like the USB port)
  • hold power supply in hand
  • Put laptop in lap.

There are tons of posts about this same issue from various laptop manufactures using Synaptics touch pads.

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"Just isolate the ground on the adapter" Followed as above. Only difference I did was taped the Earth terminal with masking tape & "Voila" It worked.

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I have the same problem on a Sony Vaio VGN-FZ140E that I bought in June 2007. The touchpad was intermittently becoming very non-responsive and could barely track my finger. After reading the above posts, I realized that I too had recently replaced the power adapter with a cheapo ($10) one from Amazon. I unplugged it and - presto - no more touchpad problems. The adapter I got works fine in charging the battery, but I did notice that per the specifications written on the brick, it puts out about .8 more amps than the original. I don't know if that has anything to do with the problem, but it was something that caught my eye because the Amazon page said it was a replacement for my exact laptop model. I did some further testing to see why the problem was intermittent for me. It turns out that when I plug the new adapter into a short, ungrounded extension cord that I occasionally use, the touchpad problem goes away.

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Recently, I discovered touchpad malfunction (i.e. jumping, erratic, etc) in two of my laptops due to a power adapter. I checked the voltage with a multimeter, and it was in range. Also, I did the RF interference test explained in other posts, and found no interference caused by the power adapter.

Finally, I followed the pevious post to eliminate the capacitance charge touching the ground metal of the labtop, and the touchpad control improved a little. So I desided to have a better ground connection somewhere outside the laptop. I used a piece of thicker aluminum foil from a sealer of a ground coffe container. Then I managed to open one of the plastic covers at the bottom of the labtop, and secure the aluminum sheet with one screw inside the cover. Then I bend the aluminum sheet to have an exposed sueface outside. Finally, I secured the edges with etectric tape. This creates a permanent grouding surface that can be touched by hand or my lap.

I tested and it works great. The adapter does not afect the touchpad anymore. Just make sure the aluminum sheet only touches ground and no any other circutry connection.

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This appears to be a common problem, especially with replacement adapters, judging by the number of posts on the net. However, no solutions seem available. I have recently encountered the same problem with some HP and Toshiba laptops which I bought. I had some genuine adapters but some were missing so I bought replacements on ebay. With most, when they were plugged in the touchpads were erratic and unusable. Running on batteries, everything was fine. As I could compare the situation with genuine adapters, it was easy to prove it was an adapter problem. A USB mouse worked fine even when the replacement adapters were plugged in. Interestingly, if a metal part of the laptop were touched, eg, VGA port, com port, USB port, then the touchpad worked rormally with the replacement adapters. It wasn't due to the earth pin on the adapter as some have suggested, as the original Toshiba adapters only have 2 pins and work fine. It must be due to the earthing of the laptop itself which in the original adapters probably occurs via the neutral pin. There are 2 work arounds. I have given up on the touchpads and am using a USB Mouse. You can also plug in a USB printer cable and tuck the other end into your underwear but that's hardly practical. If you buy a cheap replacement adapter off ebay, I suggest that more than likely you will still have the same problem. If you can get a genuine replacement (expensive?) then you should be OK. Cheers

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