Uh... guys... I guess this is no longer a bug now... because I have just
found the cause of the problem in the /var/log/pm-suspend (I get to know
the existence of this log file in another bug):

/usr/lib/pm-utils/sleep.d/00powersave suspend suspend: success.                 
                   
/usr/lib/pm-utils/sleep.d/01PulseAudio suspend suspend: sudo: pacmd: command 
not found             
sudo: pacmd: command not found                                                  
                   
Returned exit code 1.                                                           
                   
二  1月 19 22:08:08 CST 2010: Inhibit found, will not perform suspend

So I had installed PulseAudio, but it lacks auxiliary tools to help it
get suspended, so the suspension process of the system failed
repeatedly. So I have just installed the pulseaudio-util package, which
includes the pacmd command, so now I can suspend my laptop through KDE's
Powerdevil applet.

However, Fn+F1 is still not working. I hope I can find the answer soon.
Thanks for your attention.

** Changed in: linux (Ubuntu)
       Status: New => Invalid

** Changed in: linux (Ubuntu)
       Status: Invalid => Confirmed

** Changed in: linux (Ubuntu)
       Status: Confirmed => New

-- 
Fn+F1 fails to suspend/hibernate on Lenovo S10-2
https://bugs.launchpad.net/bugs/509073
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