erratic mouse pad problem with AC adaptor fix wosks for all computers that i had the problem on ACER
some random DESKTOP DELL when the AC is on I found it may have been one of the auto start up 3rd party programs
you just have to disable the programs that load at start up and I suspect it was a bug in (utorrent)
i also expected it was the connecttion other some hiden ethernet over powerlines
any way you just have to disable the start up programs and reset the computer
or you can see how long you have control over the pad and see what program loads when you get erratic mouse pad
that would be the one to heal any way join us on the http://www.efnet.org/
channel #buzz or #security
Mine was erratic as soon as it was booted up to LINUX (version didn't make a difference). At first I thought it was a software bug, but it turned out to be the non-DELL power adapter, brand name, "CBD", I had my e6400 plugged into. If the power adapter was disconnected the cursor worked perfectly. I had a second "CBD" and tried it with the same result. Threw both away. With a DELL power adapter everything works just fine.
"I know you think you know what I said, but what you need to know is, I didn't say what I meant" PEACE [B]
Hello, so I noticed the other replies, and maybe their solutions helped, but for anyone with this same problem that has not found an answer, & has Windows 10, try this:
1. Open Task Manager (right click bottom bar in a blank space - same bar that has the time - choose "Task Manager")
2. Under where you see "Processes" click "Name" to sort alphabetically.
3. Find a process called "Rich Video" or something like that (I didn't get a good look before ending it). Right click on it and "end task."
I have the original Dell adapter and had the same problem that you did. Only when I plugged it in would I get the erratic touch pad when using it. For some reason, ending that task stopped it. I just ended tasks till the erratic movements stopped and the "Rich Video" one was the one that seemed to do it. I looked up what it is, and apparently it's a normal part of Cyberlink, so it's probably not Malware, but I did see people complaining that it slows up your computer to almost a halt. That could be what was happening. I don't understand why the charger made any difference, but wanted to share what worked for me.
i know this is an older post, but it's worth answering. dell adds a chip inside their chargers that if not used will cause their laptops to NOT work properly with any other chargers. similar to what printer companies have done with ink cartridges. if you don't believe me just google it. very disappointing.
The issue is the grounding for the charger. I tested this myself with an asus Q200e. I lost the OEM charger and had to purchase another one. Once I began using the aftermarket charger, the erratic behavior began. The only saving grace is that the laptop is a metal body. So If I place my palms on the body and use the touchscreen or pad, the erratic behavior stopped. As soon as I removed my hands, it began again. You'll need to purchase a charger that is internally grounded or has a ground loop isolator built in. Otherwise, you'll have to find a way to ground the laptop while using the charger.