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running ubuntu 14.04, unity 7.2.1 on Dell e5540 laptop. time after time Tab key starts working a little strange.

  • doesn't work by itself - autocompletion in bash or switching between inputs in a browser forward
  • doesn't work with ctrl - switching between tabs in browser forward
  • does work with shift - switching between inputs in a browser backwards
  • does work with ctrl+shift - switching between tabs in browser backwards
  • does work with alt - switching between windows

the issue appears without any reason i can think of and disappears after a while without me doing anything about it.

seen same behavior on my previous laptop, which was also from Dell and was on ubuntu 12.04.

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