Touch problem while charging through USB on computer

[DanneLeo]

Everytime when I plug in my phone through USB cable to my ACER laptop, the touch does not respond when using the phone, even though I used the original USB cable that is provided with the phone. And I've sent my phone to the repair center because of the same issue. But the problem still persist.  But when I use my brothers laptop which is different model as mine, the touch respons flawlessly. I NEED HELP HERE

[dm84]

below is a link that might answer your question 

http://sindhu.ece.iisc.ernet.in/systemslab/documents/cellphone_chargers.pdf

[DanneLeo]

So the problem has nothing to do with my phone?

[DanneLeo]

I need Sony admin to confirm this..

[dm84]

I assure you its not the phone but the source of power due to the fact it works flawlessly on another device but not perfectly with your acer laptop 

[Ramm31]

@Danne94 Same problem here, I also have an acer laptop and everytime I connect the phone to one of the usb ports of my laptop, the touch screen becomes rough/buggy =/. Is there any sony admin there that can help us?

[mukulv]

all xperia sp user, plz update ur phone to latest firmware i.e 12.0.a.2.254...u'll never get this touch problem..sony has solved touch problem..

[Ramm31]

Im already on that fw and the problem persists =/, any ideas, @mukulv? I just did the reinstallation of that fw and, as i said before, the problem is still there, everytime I try to use my phone place in a flat surface, the touch does not respond properly =(, its sad because I like this phone, but I cant have a good experience with problems like this...

[Avanish]

same problem with my xperia sp while charging via original charger or laptop touch screen start freezing randomly

[yanpurwadik]

I also experienced the same thing, but the problem occurs when I connect the charger to the power source, also to the laptop that is connected to the power source.
There is now the latest update, hopefully it can eliminate this problem.