This bug concerns an old release but I confirm that the issue still exists on Feisty with 2.6.20. As far as I can tell, changes made for 2.6.18 by upstream at Intel were backported to Ubuntu packages after 2.6.17-7, which is where it broke previous ACPI behavior on a number of ThinkPads.
This bug concerns an old release but I confirm that the issue still exists on Feisty with 2.6.20. As far as I can tell, changes made for 2.6.18 by upstream at Intel were backported to Ubuntu packages after 2.6.17-7, which is where it broke previous ACPI behavior on a number of ThinkPads.