ACPI not working on DELL Inspiron 1150

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Hi. I'm a newbie to linux, but I've been getting this problem ever
since I installed it on my computer (I've already tested Fedora Core 5
and Ubuntu 6, both having the same problem).

1) I first discovered that my laptop display didn't turn off when the
lid was closed (I can tell because I can see the glare of the display
through a gap). So I started investigating and found that the lid
event is not triggered whenever I close/open the lid (using
acpi_listen). But the weirdest part is that the event is reported when
doing "cat /proc/acpi/button/lid/LID/state".

2) Then I realized no events are reported through acpi_listen, except
for "ac_adapter" event which occurs after resuming the laptop from
hibernation.

3) I've also found that sometimes the computer freezes when resuming
from hibernation (I can only confirm this under Ubuntu, I can't
remember what happens with Fedora).

4) Finally, for some reason gnome power manager doesn't put into
hibernation my computer when battery is too low (the only time I
tested this was under Ubuntu) and simply runs out of battery.

Since #'s 1 & 2 have ocurred under Fedora and Ubuntu, I assume there
is some low level problem/incompatibility of ACPI with my computer's
hardware. Everything works fine under WinXP, and to me power
management is a must for my laptop.

I've read some stuff about DST's, but sincerelly I didn't undestand
much (ie. where does this DST reside? Is it a firmware?), but I wonder
if the fact that my DST says "MSFT" could be the cause of ACPI not
working propertly.

Thanks in advance.
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