laptop - Extremely laggy touchpad after drop EDIT : After plugging to power source
2014-07
bluesm
LOOK at EDIT 4 at first!
I dropped my laptop - Acer Aspire 5742z and everything works fine but the touchpad.
It looks like touchpad send the information about position of finger every 500 ms or even more rarely.
Do you have any idea what could be a reason for such a behaviour ? I would understand touchpad not working (because say, connectors are broken afer drop) but "lagging touchpad" ?
Thank you very much in advance.
PS: It is not software issue - I check it on two operating systems (Windows 8 and Debian Linux)
EDIT:
What is even more strange, the lag doesn't have stable "interval", in the 2 hours of using such an touchpad, there are times when lag is 500 ms, and there are times when lags almost disappear.
EDIT2:
After 5/6 hours, the touchpad comes to live without lagging. Miracle. Is there anybody who could explain this ? I'm dubious but maybe somebody encounter the same problem ?
EDIT3:
I was actually experienced the problem only in one place! In my library when I plug my laptop to the power!
Amazingly, when I unplugged my laptop it works perfectly, when you plug it again (to this outlet) it makes my touchpad laggy again!
EDIT4: I posted on the Library's Facebook page, and I got response that this is common problem. Even very common problem. And they don't know why this happened.
Ikke
My original laptop adapter broke down, so I've bought a new one. It's a no-brand adapter from a dutch internet shop.
The power of the new adapter is slightly more than the old adapter, but in my opinion that shouldn't be a problem.
The laptop is a Toshiba Sattelite L40-15B. When the old adapter broke down due to short circuit, this laptop was connected.
When the adapter is unplugged, the touchpad works correctly and smoothly. But as soon as it is connected, the cursor moves jumpy, and response badly.
Does anyone know where this problem comes from, and if there's a solution?
TheSmurf
My initial feeling is that the new power supply is causing electrical interference. The touchpad is likely connected internally via USB, which CAN (won't always of course) be susceptible to interference.
Here's a test for this.... do you see the incorrect behaviour if you have your new power supply plugged in an sitting next to your computer, but not actually plugged into the machine?
Canadian Luke
I have the same problem (erratic or no control on the touchpad) and found it disappeared as soon as I unplugged the replacement (and probably not from the laptop manufacturer) power supply from my HP laptop. I then found this post on another forum that seems pretty accurate:
My guess is that there might actually be something wrong with the touchpad circuitry, or you have a power supply problem as suggested in this clip from Wikipedia:
If the computer is powered by an external power supply (PSU), the detailed construction of the PSU will influence the virtual ground effect; a touchpad may work properly with one PSU but be jerky or malfunction with another (this does not imply any electrical risk whatsoever, a delicate capacitative ground, not a contact ground, is at issue). This has been known to cause touchpad problems when a manufacturer's PSU, which will have been designed to work with the touchpad, is replaced by a different type. This effect can be checked by touching a metallic part of the computer with the other hand and seeing if operation is restored. In some cases touching the (insulated) power supply with some part of the body, or using the computer on the lap instead of on a desk, while working can restore correct operation.
I can confirm that my issue disappears when I do the following: - unplug the power supply from the laptop. - touch a metallic part of the laptop (i.e. USB port) - place the laptop on my lap (probably earthing it as above). - touch the power supply with my hand.
All in all it seems to be down to the electronic circuitry of the replacement (non-manufacturers) power supply is not the same as the manufacturer's original unit.
So I either have to use it on my lap or plug a USM mouse in if using on a desk.
I had this issue just now, then found this while attempting to troubleshoot. At first I thought this was caused by a recent Ubuntu update that conflicted somehow with my Dell Mini 10.
Turns out it was the power outlet I was plugging my laptop into. What's even more odd is when the power strip I have the power adapter plugged into is switched off, the mouse still does not work. So I started plugging in the switched off power strip with my power adapter and laptop plugged into it to other outlets and with all of them my mouse works except this one outlet. So I then discovered that although everything else I've plugged into this outlet seems to work, when the fish tank light which is plugged into this same outlet is on, the mouse on this laptop doesn't work whether the power strip is switched on or off. Just last week though, this very plug/power configuration was working perfectly. Maybe this 1 year old netbook is starting to show it's age? At any rate, I hope this helps someone!