> To be sure, can you please check whether pressing Ctrl+Alt+F1 (to switch to a 
> text console) and then Ctrl+Alt+F7 or Ctrl+Alt+F8 (to switch back to the 
> graphical desktop) will cure the hang?
I can not switch. What exactly I do:
1. Press Fn one or few second, or Fn and of F1-F12 buttons (It's also take one 
or few seconds).
If I press and release in a short time problem not reproduced.
2. Launch "sudo /lib/udev/keymap -i input/event4". Because I press Fn button 
before keymap tool put many empty lines to stdout.
3. Try to switch to another VT as usual, but without success. Keymap show 
scancodes of Ctrl, Alt and F1, but system not switch to first VT. (I also try 
other VT's with same result)
Result of this try you can see in attached log - many empty lines generated by 
pressing Fn button, and Ctrl, Alt, F1 scancodes.

Also I try to launch keymap tool in VT - it's suddenly, but hangs bug
not reproduced in VT at all - only in GUI (I try both of Gnome and KDE).
Fn button still not generate scancode, in keymap launchad in VT tool
too.

> Also, can you please doublecheck that you ran keymap against the correct 
> input device? Do you see scan codes for the other keys there?
Yes, sure. All other keyboard button, except Fn button.

** Attachment added: "try1.log"
   
https://bugs.launchpad.net/ubuntu/+source/udev/+bug/543036/+attachment/1626207/+files/try1.log

** Changed in: udev (Ubuntu)
       Status: Incomplete => New

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Lenovo Y550 - monitor settings and wireless settings buttons not work
https://bugs.launchpad.net/bugs/543036
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