I had the same issue with my U300s.  When I pressed "t" key, the key was
recognized as "F10".  I'm using the US key mapping.  It started less
than a week after I received it from Lenovo.

>From what I see, the cause of the symptom is not in the OS level.  Like
Will stated I observed the same symptom in the BIOS level.

I applied the latest BIOS update from Lenovo (ver. 56cn43ww) that was released 
on April 20.
http://consumersupport.lenovo.com/us/en/DriversDownloads/drivers_show_5482.html

After the BIOS was updated, the wrong key mapping was fixed.  I assume
Lenovo was aware of the mapping issue and included the fix in the
current BIOS update.

One thing to note is that you may need to restore the factory default OS
(Win7) to apply this update since no iso version is distributed by
Lenovo at this moment.

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https://bugs.launchpad.net/bugs/974455

Title:
  Lenovo u300s 't' key sends "Hiragana-Katana"

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