I had this problem on Dell Inspiron 5100, Ubuntu 8.10 and now that I
updated the kernel to  2.6.27-8 the problem persists exactly the same
way as I described it before. Is this update supposed to fix it?

I am not sure if the following is relevant, but here is what I think may be the 
reason for this.
I looked at the changes to /drivers/input/keyboard/atkbd.c, as reported by 
Richard Hughes earlier, and realized that the condition for this patch to work 
is that some hardware identification strings need to match with whatever string 
is written in that file (/drivers/input/keyboard/atkbd.c). So, assume this file 
contains a comparison like this:

    DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),

However, on my system, when I execute 
$ sudo dmidecode | grep Vendor
the output is:
        Vendor: Dell Computer Corporation

which, although referring to the same manufacturer, is still entirely
different string. Maybe the problem is that different laptops identify
themselves with slightly differently and the patch is not general enough
to account for all of them?

Attached is output after sudo dmidecode.

** Attachment added: "dmidecode.txt"
   http://launchpadlibrarian.net/19556808/dmidecode.txt

-- 
Losing keyboard and mouse control when changing screen brightness with fn + 
arrow under intrepid
https://bugs.launchpad.net/bugs/285323
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