Why Debian i915 intel driver depends on button.ko?

[Lucas <macachuto@gmail.com>]

I am trying to find out what can cause unusable screen picture on my Sandybridge Chipset

00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family 
Integrated Graphics Controller [8086:0102] (rev 09)

I compared outputs of lsmod from Ubuntu (3.2.0-25), Fedora ( 3.4.2-1.fc16.x86_64)  and Debian Wheezy 
(3.2.0-3-amd64 / Debian 3.2.23-1) and it seems that Debian i915 depends on button.ko, which depends 
on ACPI lid button.

I have Fedora and Ubuntu on laptop - they do not have that module loaded. So their i915 can operate 
without button.ko.

Was there any reason why Debian Intel video driver needs to be dependent on button.ko.

And neither Fedora or Ubuntu has any modules belong to acpi (even on laptop).
And what about desktops - there is no any lid buttons there.

May be button.ko should be removed from i915 video driver?


Thanks in advance.