Hi, same problem here.
(BTW I'm sorry to have filed a duplicate bug; yesterday I couldn't find this
thread).
IMHO it could be a kernel problem (conflicts between modules or else).
If I run "showkey -s" within a VT, I get the following output, just by
pressing "brightness up" (even if not releasing the key, which has no
efects at all):
0xe0 0x54 0xe0 0x54 0xe0 0xd4 0xe0 0x54 0xe0 0xd4 0xe0 0xd4 0xe0
0x54 0xe0 0xd4
and pressing "brightness down":
0xe0 0x4c 0xe0 0x4c 0xe0 0xcc 0xe0 0x4c 0xe0 0xcc 0xe0 0xcc 0xe0
0x4c 0xe0 0xcc
Similar results with "showkey" without -s parameter (instead of two bytes
groups it gives three bytes ones).
My system is a Dell Inspiron 9400, Ubuntu 8.04 LTS x86_64, up to date.
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Four steps of brightness changing after pressing a brightness key only once
https://bugs.launchpad.net/bugs/239413
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