T410 keyboard doesn't keep up to my typing speed / doesn't accurately

[bradhs]

Weird issue.  I can type faster than my T410 keyboard can handle.  I type some words super-fast because I'm so used to typing them.  I am coming from a T61 that doesn't have thsi problem.  For example, if I type ping I get: ipgn or gni or pgni or pg or pgni... Another exampei is when I try and type a ? ... Instead I get / when I go fast.

I'm not experiencing this on my externally attached keyboard though the docking station. My T61 is fine, we have a X200 that is also fine.

Any ideas?

[erik_h]

You are simply timing your presses to a keyboard with a different feel.

To illustrate it with a metaphor:  Take the finish line of a 100m sprint, and record the relative timing and order of the finishers.

Now move the finish line by 8 feet in either direction.  The relative timing changes.   The relative order may also change.

So: Your fingers are the sprinters, your text is the timing, and the physical characteristics of your keyboard (weight, travel, detents, etc) are the finish line.

If you want to get technical about it: your fingers are hitting those keys at a certain speed and with certain pressure and at certain times.  Each factor is different for each finger.

On your T400 keyboard, the combination of your finger movements with the exact placement of the key register (the point at which the key actually sends a keypress signal) produces a DIFFERENT from the T410.  So you get different results.

If your fingers were moving at exactly the same speed/pressure/etc then a change would affect all of them equally.  But they're not.

Different keyboards feel different.  learn to type "ping" at a 120wpm speed on your T410, practice it a while, and you'll have a problem on your T400.

[ggraudins]

I am having the same exact issue.  I am a touch-typer and usually crank out certani key combinations really fast.  I do this on a number of computers - my old t61, my old dell laptop, my workstation, etc. and they all work just fine.  On the new t410, however, I find that yuo have to slow yourself way down to almost noe-key-at-a-time speed, otherwise the characters get registered backwards - ni instead of in, no instead of on, and so forth.  What's worse, the behavior is not consistent - you can type 'ping' a hundred times fast and most will be 'ping' but a sizable portion of them will be 'pnig's Have they just gone cheap w/ the keyboards??? This is a real issue - I don't see any special keyboard settings I could tweak or driver updates to download.  

[bradhs]

I've been typing for over 20 years at very fast speeds.  There is a problem with the T410's keyboard.  I've had my T410 for a month now and I've had to slow down typing. I went back to my T61 just for giggles and I can type perfectly on it.

I cant type ping at 120wpm on a T410 keyboard, it will screw it up every time.

[GSW]

Does the problem start at 105 wpm? 110? 115? 118?

Our T410 seems to input text beautifully at my sub-50 wpm.

______________________________________________

Re: T410 keyboard doesn't keep up to my typing speed / doesn't accurately[ New ]

 02-18-2010 08:40 PM

I cant type ping at 120wpm on a T410 keyboard, it will screw it up every time.

[Navck]

~ 50% with 150WPM, I do fine on my Model M but I believe the firmer keys on the T410 (Compared to my T43) might be messing with me. I've been getting used to this

[bradhs]

What I'm learning to do on the T410 keyboard is to lift my fingers up slightly more to slow my typeing down.  I don't do this on my other keyboards, just this one. I also use my wife's X200 and my docking station keyboard.

[jrhees]

I have the same issue with my T510. I have looked at this extensively. The issue appears to be with a slower BIOS scanning of the keyboard. (I am not sure if the keyboard on this laptop uses its own controller and bios or whether the keyboard controller is integrated on to the planar board).

You can do this test to prove the issue:

1. Pick a *single* key on the keyboard, say the 'a' key. Try striking the key *very* quickly. When I say quickly what I mean is to hit the key firmly but to get you finger back OFF the key as quickly as possible. If you do this, you will find that the keypress does not register at all.

2. Now, if you try the same trick on an older T-series (I have a T42) this will not happen. In fact, no matter how quickly you hit the key it will *always* register.

Based on this, I would initially say that the debounce time in the keyboard controller is set too long, but because other (as well as myself) are *also* seeing the issue with keys showing up out of order, then the issue is more likely the speed at which the keyboard controller is *scanning* the keys. A slow keyscan will cause both missed keys and keys to appear out of order (your typing is racing against the order in swhich the keys are scanned).

I will be contacting Lenovo support today about this but doubt I am going to make any headway. Luckily at the moment I am mostly using an external keyboard with my new laptop so I can live with this. That also helps with my sanity since they moved the 'INS' key and that is driving me nuts

Jon

[cassio]

---

jrhees wrote:

........

You can do this test to prove the issue:

1. Pick a *single* key on the keyboard, say the 'a' key. Try striking the key *very* quickly. When I say quickly what I mean is to hit the key firmly but to get you finger back OFF the key as quickly as possible. If you do this, you will find that the keypress does not register at all.

........

Jon

---

for what its worth, i don't have this problem with the t400s. i tried this test, striking the key as quickly as i can manage, and it recognised every key. now, i know i'm using a different laptop, but according the hardware maintenance manuals, t400s, t410, t510 (and t410s, w510 for that matter) all use the same keyboard. so if you're having that problem, it might not have anything to do with the keyboard itself.

[GSW]

I absolutely cannot reproduce your results following your method on a T410 in spite of numerous attempts and striking different keys.

As another test for keyboard lag, I tried holding down a single key for several seconds. When I lift my finger, the key stops displaying immediately without any lag whatsoever.

____________________________________________________________________

jrhees wrote:

........

You can do this test to prove the issue:

1. Pick a *single* key on the keyboard, say the 'a' key. Try striking the key *very* quickly. When I say quickly what I mean is to hit the key firmly but to get you finger back OFF the key as quickly as possible. If you do this, you will find that the keypress does not register at all.

........

Jon