> Did you get the system in that configuration, or did you purchase it and put Linux on it?
I tried to get it with Ubuntu preinstalled, but neither Lenovo's website nor their phone support could configure it that way. After about 20 minutes on the phone, I managed to get the exact hardware configuration shown on Ubuntu's certification page: AMD A4-5000, Broadcom BCM43142, etc. In hindsight, I doubt Lenovo ever sold an X140e with Ubuntu preinstalled.
> Regardless. Why didn't you return it and get something that worked? Curiosity? Cussedness?
When I first turned it on, I noticed the X140e had several annoying LEDs. Both "ThinkPad" logos had glowing red dots in their i's. There was also a large green LED near the camera. It glowed whenever wifi was powered-up (pretty much all the time). I found these annoying, so I painted them over. Oops. Next time I'll use nail polish, which can be removed with acetone.
> I find it reasonable to spend between a couple of days to a week researching the suitability of something that I'll use throughout the day, every single day for next three-to-ten years.
Our thoughts on this matter are quite similar. On average, I spend almost 10 hours a day using my primary development machine. I upgrade every 1-2 years, which works out to 5,400 hours of use. That's a lot of time interacting with one piece of hardware. I definitely want to make sure I get the best tool for the job. That 5,400 hours has another implication: Amortized over the life of the machine, even a $3,000 laptop will only cost ≈50 cents per hour. That makes me extremely insensitive to price. I simply want whatever works best.[1]
As peatfreak said, research won't guarantee satisfaction. The only way to really know if a piece of hardware will work for you is to actually use it. That's one huge advantage of Apple (and now Microsoft) products: I can walk into a store and test the hardware/software combo. In just a few minutes, I can tell if the it lacks the annoyances in my list[2]. These details are extremely hard to verify without actually using the machine.
I would be much more open to getting a Linux laptop if I could try it out before buying. Unfortunately, I don't think the market is big enough to make brick-and-mortar stores feasible.
1. I've written about this in more detail at http://geoff.greer.fm/2010/10/30/expensive-computers-are-wor...
2. http://geoff.greer.fm/2015/07/25/laptop-annoyances-or-why-i-...