Public bug reported:

Fn+Volume Up(PgUp)/Volume Down(PgDn)  works.

Fn+Wifi(F2) - doesn't work. No OSD; LED doesn't light; no entries in syslog. 
xev output shows a tight loop of  KeyPress/KeyRelease events.
If Fn+Wifi is pressed after clicking on the desktop, top shows nautilus taking 
about 10% cpu. clicking on some window stops it.

Fn+battery(F3) - doesn't work; No OSD.
same tight loop of xev output as above,

Fn+Brightness Up(Up Arrow)/Brightness Down (Down Arrow) - partially works but 
buggy.
When keys are pressed even only once, OSD appears and the brightness 
increases/decreases continuously (along with the indicator bar), until it's 
max/min (like the keys are stuck). Afterwards the desktop simply doesn't work 
properly; windows can't be moved; console doesn't get the focus when clicked; 
keyboard doesn't work. Logging out and back in again brings things back to 
normal.
no tight loop shown in xev (maybe because the OSD appears).
sudo /usr/bin/acpi_fakekey 224 (or 225) works properly. 

possibly related bug reports:
https://bugs.launchpad.net/ubuntu/+source/acpi/+bug/272292
https://bugs.launchpad.net/ubuntu/+bug/281421

xev output files attached.

All of these worked fine on Hardy.

Ubuntu 8.10 Intrepid
Linux wolfie-laptop 2.6.27-7-generic #1 SMP Wed Oct 22 00:29:18 UTC 2008 i686 
GNU/Linux
system is fully up-to-date as of 23-Oct-08

wolfie:~$ lsb_release -rd
Description:    Ubuntu 8.10
Release:        8.10

wolfie:~$ sudo dmidecode -s system-manufacturer
Dell Inc.
wolfie:~$ sudo dmidecode -s system-product-name
MP061                           
wolfie:~$ sudo dmidecode -s system-version
Not Specified

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
[Intrepid] On DELL Inspiron 9400 some Fn+keys don't work (instead creates a 
tight loop of KeyPress/KeyRelease events in xev)
https://bugs.launchpad.net/bugs/288579
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