IBM ThinkPad T42 problems with ACPI
thully at umich.edu
Sun Oct 10 21:55:58 UTC 2004
I installed Ubuntu on an IBM ThinkPad T42.
Just about everything works great (including wi-fi!), and the
whole system is very stable. However, I am having one nagging problem
with ACPI. I set up a basic script to put the laptop into suspend when
I close the lid that removes ehci_hcd (which prevents a suspend) removes
my hsf winmodem drivers, and then puts the laptop into suspend with a
echo 3 > /proc/acpi/sleep.
While this works, my laptop gobbles HUGE amounts of battery while in
suspend (about 10% of the battery per hour!) and I can't figure out
why. I know it is suspended (the suspend light is on, and all the
drives/fans were off) but something is wrong. In Windows, suspend works
fine. If I use APM, I can suspend fine without gobbling battery but my
laptop is much more hot (as speedstep is incompatible with APM), and
gets worse battery life. Does anyone have a solution to this? It has
happened with every distribution I've tried.
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