I've tried to enable low-level debugging with:

echo 1 > /sys/module/i8042/parameters/debug

What I get is this:

Nov 22 20:28:31 thunder kernel: [ 7063.583624] 
/build/buildd/linux-2.6.35/drivers/input/serio/i8042.c: e0 <- i8042 (interrupt, 
0, 1) [1768702]
Nov 22 20:28:31 thunder kernel: [ 7063.583697] 
/build/buildd/linux-2.6.35/drivers/input/serio/i8042.c: 5b <- i8042 (interrupt, 
0, 1) [1768702]
Nov 22 20:28:31 thunder kernel: [ 7063.583767] 
/build/buildd/linux-2.6.35/drivers/input/serio/i8042.c: 19 <- i8042 (interrupt, 
0, 1) [1768702]

Nov 22 20:28:33 thunder kernel: [ 7065.812387]
/build/buildd/linux-2.6.35/drivers/input/serio/i8042.c: 99 <- i8042
(interrupt, 0, 1) [1769260]

Nov 22 20:28:48 thunder kernel: [ 7080.289168] 
/build/buildd/linux-2.6.35/drivers/input/serio/i8042.c: e0 <- i8042 (interrupt, 
0, 1) [1772885]
Nov 22 20:28:48 thunder kernel: [ 7080.291579] 
/build/buildd/linux-2.6.35/drivers/input/serio/i8042.c: db <- i8042 (interrupt, 
0, 1) [1772886]


The first three lines is then I press F8 (there's nothing in response to 
pressing Fn), the following line ('99') is for depressing F8 and the last two 
lines is for depressing Fn. 

However, I am still not sure how I make setkeycodes do anything useful
with this, much less how to handle a 3-byte code reported above.

-- 
Fn-F8 broken on Dell E6410
https://bugs.launchpad.net/bugs/642715
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