When I prees Fn+F2 my screen turn black what does it do? I want to know what change does it make. When at window7 I press Fn+F2 it will turn on wifi. After I restart nothing happen , did it will make eror?
sorry about my bad english
When I prees Fn+F2 my screen turn black what does it do? I want to know what change does it make. When at window7 I press Fn+F2 it will turn on wifi. After I restart nothing happen , did it will make eror?
sorry about my bad english
After pressing Fn+F2, try and see if Fn+F7 or Alt+F7 bring you back to the GUI. It sounds from your description that Fn may be behaving like Ctrl+Alt. If that's the case, then it's switching virtual consoles. The seventh virtual console is typically your GUI; lower-numbered ones behave as text terminals.
See:
However, if the screen turns completely black, then that's probably not what's going on. In that case, it probably dims or turns off the screen.
So another combination should brighten or turn on the screen. Assuming you've tried pressing Fn+F2 again to see if it toggles things back to the way they were before, you might try Fn+F1 or Fn+F3 to see if you can reverse the effect of Fn+F2.
If this was a one-time occurrence and the question is whether or not it represents a problem you have to worry about, the answer is probably not. In that case, I'm not sure of the cause, but it could be:
All of these explanations suggest a bug, but there are probably other explanations. If the problem happens again, then I recommend editing your question to provide more information (or posting a new one if the situation has changed considerably). In that case, the main question will be whether or not it's a bug and, if so, what package to report the bug as affecting.