05-17-2011 01:57 PM - last edited on 01-14-2012 07:32 PM by billbolton
I am a computer technician who just recently purchased an x220 for personal use. I always feel like I've seen it all, but I fear this one is entirely new to me.
My x220 appears to work perfectly under nearly all conditions, with one exception: whenever a 90-watt adapter is attached, the touchpad pointer begins skipping so badly as to become completely unusable within a short period of time. As far as I can tell this only occurs when the 90w adapter is attached, and not even when it is only sitting near the PC. Making matters even more confusing is the fact that TWO different 90w adapters have led to the same result.
I am using the 90w UltraSlim adapters that Lenovo lists as a compatible accessory on their purchase configuration pages. What I want to know is this:
Moderator edit: Added UltraSlim to message topic
05-17-2011 02:36 PM
I don't have the Ultraslim adapter, but I do have a standard lenovo 90w adapter that came with my docking station.
I have checked and I don't have the touchpad problem you described.
However, that adapter does give me problems - it causes a warbling sound to come out of my X220 whenever it is plugged in and on.
This is a warbling sound coming from the laptop itself, not the adapter, and it doesn't occur when I use the 65w adapter, only the 90w one. It happens whether powering the laptop directly or via the docking station. And I have tried two 90w adapters and it occurs with both, so it isn't a faulty adapter.
What's the difference between the adapters? Well, the 65w ones read 20.1v at their pins, but the 90w ones read 20.4v (unloaded). I think this may be the problem.
My solution has simply been to use the 65w adapter, even with the docking station. I haven't mentioned it on the forums yet because I'm still dealing with the other two noise-related issues with my machine.
I'm telling you this because I wonder if a similar thing could be happening in your case - perhaps your 90w ultraslim adapter puts out a slightly higher (or lower?) voltage and the voltage regulators on the mainboard and having to do more work, leading to electrical inteference which is affecting the touchpad.
Do you experince this issue with the standard 65w adapter?
05-17-2011 02:36 PM
05-17-2011 06:21 PM
That is a very interesting observation. It could indeed be the case that this is what's leading to my issue. Having tried two 90w adapters, neither works, and the 65w adapters do not cause this problem. I am frustrated and may simply need to return the 90w adapter (the second one that I've bought!) and deal with 65w adapters only (thus sacrificing the convenience of the travel tips, etc. that the 90w UltraSlim comes with).
Yep--that was the first thing I tried after narrowing down to the hardware level. The touchpad seems to be seated just fine.
Could someone else check and see if their exhibits the same problems with the UltraSlim?
05-18-2011 04:03 PM
Can anyone with an UltraSlim adapter please test their system with it to see if the same behavior is exhibited? Even someone at Lenovo if they have a moment--it would be greatly appreciated.
I am beginning to wonder if I ought to RMA this whole machine.
05-18-2011 04:10 PM
When i had a Thinkpad W500 i used the Ultraslim adapter for a long time without any issues like you describe. I also used the Ultraslim adapter with a T410s without any issues. Now i got a W520 that require 170w power so i cannot use it anymore. The company i work for there are several users with the Ultraslim adapter and never heard of any problems, but none of them got the X220.
05-18-2011 04:24 PM
Thanks gan. So it seems it's either a problem with the x220, or with MY x220 or one of its parts.
Is it at all possible that this may be due to a faulty battery? I ask because I am also experiencing occasional random hibernation where the OS apparently has been told that battery level is critical (but where it is, in fact, nowhere near that). This second issue is a known problem that another user once posted about--but I don't believe a resolution was ever published.
Honestly, as much as I love this laptop, I may end up needing to return it if this sort of thing continues without a logical resolution.
05-18-2011 04:30 PM
>Is it at all possible that this may be due to a faulty battery?
It's hard to say for sure with computers since a lot of strange things can happen, but i doubt that a faulty battery could cause such a problem and only when using the Ultraslim 90w adapter. You could try to remove the battery while the ultraslim adapter is connected to see if that makes a difference.
05-18-2011 04:46 PM
I actually can't believe I didn't think of that, gan. And I'm a computer technician of many years, too!
I will most certainly try this tomorrow once I've got access to the adapters again (they're currently boxed up and ready to be returned--two of them.
Thanks! Anyone else have any input?
05-19-2011 07:57 AM - edited 05-19-2011 07:58 AM
Okay--so this is getting stranger yet. When I went today to plug in and disconnect the battery, I noticed that the issue was not occurring even with the battery attached. I have tested this four or five times already and have still had issues--but today, it all seems to be working well.
Here's why this makes no sense: