Hello James,
brightness hotkey is in our gerylist, therefore it won't block the certificate.
Further investigated this issue, I found out that:
1. Tested with $sudo showkey -s, the key press is not detected at all.
2. Tested with a external keyboard that comes with brightness key, it works.
3. Tested with 12.04.2 LiveUSB, the brightness key works as expected.
And some interesting results -
The brightness key will work when the system was booted with:
a. a specific brand 2GB FAT USB flash drive (tested with other USB, only this
brand here will work)
b. a USB 3D sound controller
c. a USB cable with nothing connected (yes, nothing, just a cable)
Only cold plug will work.
And if you unplug these device, the brightness key still work until you
reboot/suspend it.
Brightness key still not working when booted with these device plugged.
USB keyboard/mouse, USB keyboard/mouse receiver, FAT USB flash drive from 4GB ~
16GB, SD Card.
At last, it seems that this issue could be fixed by updating the system.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1143778
Title:
[Dell Latitude 6430u] Brightness keys do not work
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