If you're using GNOME, you might want to try this:
-Hit Alt-F2, enter 'gconf-editor', then press enter
-Navigate to /apps/gnome-power-manager
-Change the values of 'action-button-hibernate' and 'action-button-suspend' to
'nothing'
Does this work for you?
** Changed in: gnome-power-manager (Ubuntu)
Sourcepackagename: None => gnome-power-manager
Assignee: (unassigned) => VF
Status: Unconfirmed => Needs Info
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Sleep button cannot be disabled in Edgy
https://bugs.launchpad.net/bugs/68800
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