MBP problems with trackpad while charging

It might not be the super-best solution, but I noticed that when I rest the palm of my hand (the one I use to operate the trackpad) on the side of the trackpad. Don't know the science of it, but it must balance out the electricity somehow 🙂

No new solution, but similar experience. I bought a cheap 3rd party adapter of 85W and sometimes when I plug in I have mild trackpad issues. E.g., it is hard to make a nice circle with the cursor.

Furthermore, when I use an original adapter in the car, with a converter connected to the cigarette lighter socket, I have severe trackpad issues. It is hardly possible to operate it. I had this with two different types of MacBook Pro and two different adapters.

So maybe imperfections in the power current confuses the trackpad hardware (car converters are notorious for their bad waveform; instead of a nice sine, they may produce a block shaped voltage wave).

What helps me (in the mild case) is resting my other hand on the laptop case while operating the trackpad.

I have been having the same problem October 2017, with two rechargers, and tackpad still behave bad. The solution proposed by @fabinh works. If I touch the laptop (aluminum case), with any hand, at the same time as I use the trackpad then it works well. Maybe a problem related with static electric current or lack of negative-ground? It is incredible that I have had the problem for months, and I always have to disconnect the laptop to work with the trackpad (or use external Mac mouse that eats AA batteries like crazy). And until now that I see this review see that it works. Thanks Fabinh. It is not the perfect solution but works.

Hey guys! My problem became even more weird!

I've got MBP 13" early 2011, the issues are the same, but with one minor exception.

If I plug in the T-connector charger from mid 2009macbook white ... the trackpad simply works like charm.

Isn't it crazy?

I didn't try with any other MBP charger, but what's the difference between old T connector and the new one?? It can't be just the connector, right?

Ofcourse when using my new charger (it has beed used 2 times since now), trackpad goes wild, but placing my hand on the topcase solves the problem. It's crazy. I don't know what to do, I'm just about selling my white Macbook, but what with the charger? Stay with the old one and sell my brand new one like for free or stay with it and wait for the solution.

I've noticed one severe thing - when I go to the system raport (about the specification and connected stuff) in charger section it shows 85W charger, but on the charger there's written 60W ?! In case when I use my old one, it shows 60W - as it should. What do you think about it?

Did you try to check if the charger is recognized by your MBP propertly?

i have the same problem and i rested my palm on the side of the track pad and it works also before that / if it doesn't work i touched the bottom metal cover with my thumb whilst using the track pad with my fingers and that worked so i would try fist option then second

What watage power adapter are you using?

How long after you plug the laptop in do you mess with the trackpad?

Do you have another power adapter to try? If so, can you use the power adapter that came with this mac?

Do you have another MBP? If so can you use this power adapter on that MBP?

Are you using another pointing device or is it the one built right into the laptop? If you are using another pointing device try purchasing a new one or disconnecting or reconnecting or even try on another computer.

You might be only able to get buy for the next few month until you graduate until you can get your computer fixed. If all else fails go buy yourself a $8 mouse from a place, it will work until you can get this fixed... or buy apple mice if that is a big deal to you.

Here is one for only 3.18! http://www.bestbuy.com/site/Gear+Head-Computer+-+OM3800U+Mouse/3933383.p?id=1218 443155891&skuId=3933383

Or if you want the one I have used: (M515 @ home or HP Wired Mouse-- Its kind of old) This isn't the exact one but they discontinued that one: http://www.logitech.com/en-us/mice-pointers/mice/devices/mouse-m100 so for $10 you get a mouse and your computer works.

Its not bad to charge and unplug your computer but its not the best. Do you charge it while your at work and sleeping? If you do that you should have 6-7 hours of power after a complete charge.

It doesn't hurt your power port, it might not be the best for the battery, but its fine.

I would say just use the mouse, or if you have to have a trackpad, then buy the apple trackpad: http://www.apple.com/magictrackpad/.

I am having the same exact problem with my one month old macbook pro i tried using a different charger the one that came with my old macbook pro and it was the same thing the trackpad kept lagging and being unrensposive/ acting eratic while the charger was plugged in but immediately i unplugged it . it worked perfectly fine. im thinking of taking it to the apple store as i just bought this mac hope it dosent mean a bigger problem i did some research online and battery swelling was linked to eratic trackpad behaviour so maybe the trackpad not working well while its charged might be a problem with the battery anyways i think you should get it looked at as im taking mine to the apple store today.

Get another charger. I think your charger is malfunctioning.

These chargers are so-called SMPS'es (switched-mode power supplies). There are big advantages to using this method, they're small and efficient. However if malfunctioning, they can introduce noise which influences your trackpad.

Wikipedia:

They are, however, more complicated, their switching currents can cause electrical noise problems if not carefully suppressed

Go to an Apple store and plug your Mac into one of their chargers.

I am having this exact same problem and have tried 4-5 other chargers, to no avail.

Other than this issue, I've been very pleased with my MBP--this problem, however, is quite annoying.

Any additional suggestions would be appreciated.