This is down to interaction with 'thinkpad-keys' in 'hotkey-setup'.
Changing the slider updates the NVRAM values for the brightness.
'thinkpad-keys' notices the changes and thinks it's a key-press (Fn-Home
/Fn-End), and generates 'Brightness Up' or 'Brightness Down' commands.
'gnome-settings-daemon' sees "key press" and moves the slider again...
-> loop.
Mostly this normally resolves itself, but on ThinkPads we really need a
way to brightness key presses not to take any action, but *only* to
cause the status to be displayed in the centre of the screen.
** Changed in: gnome-power-manager (Ubuntu)
Importance: Undecided => Medium
Status: Unconfirmed => Confirmed
** Also affects: hotkey-setup (Ubuntu)
Importance: Undecided
Status: Unconfirmed
** Changed in: hotkey-setup (Ubuntu)
Status: Unconfirmed => Confirmed
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[Feisty] Thinkpad R51 LCD brightness control cycles between lowest settings only
https://launchpad.net/bugs/81407
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