ACPI issues - suspend-to-ram and processor speed

[Andre Eisenbach <andre-+hZUvIEKc2q1Z/+hSey0Gg@public.gmane.org>]

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Dear ACPI devel team,

I have two issues which prevent me from fully enjoying my notbook running on 
Linux. Both are seemingly related to ACPI. Please help me understand the 
problems better and maybe fix them or help me attempting a fix.

The notebook in question is a Compaq Presario 2100Z with an AMD Athlon XP 
2400+ processor. Current kernel version is 2.6.6-mm2. I am not applying any 
ACPI patches from sf.net, but rely on whats in the kernel (which may be my 
first mistake).

I am very willing to learn and may be able to fix it myself, if you guys can 
help me find out more about which components are involved.

Problem 1 - Cannot suspend (or resume better)

Right now I am unable to suspend my notebook in any for or fashion (ram, disk, 
etc.). Therefore I have to turn off the notebook and boot again, which 
honestly makes the notebook pretty useless.

When I try to suspend to RAM, the suspend part seems to run fine (I can see 
suspend-to-ram messages), the lcd shuts off and the power button starts 
pulsing slowly (indicating standby). So far so good. However, if I hit the 
power button then to resume, the device seems to want to wake up (hd spins 
up, fans start) but the LCD never turns on and the notebook quickly (1-2 
seconds) later switched to off (all quiet/lights off). Hitting the power 
button again starts a normal startup.

I also tried to suspend to disk using swsusp. That corrupted my swap partition 
and didn't resume.

What does it take to suspend to RAM?
What could be broken, and where should I start looking if I want to fix it?
What more debug information do you guys need?

Problem 2 - CPU slows down when on battery

When the power cord is unplugged, my CPU slows down quite a bit. This is not 
indicated in /proc/cpuinfo and NOT due to cpufreq / powernow adjustments.

The problem does not seem to occur with ACPI=OFF 

More details here in a post to the linux-kernel mailing list:
http://lkml.org/lkml/2004/5/9/100

Also a relevant and informative entry here:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=467655

When on battery, KDE is barely usable. Once again it doesnt make much sense 
for a laptop not to be usable on battery ... :(


Thanks for your attention and hopefully for your answers/comments. I can 
provide as much debug/info/configs as you would like and as a programmer am 
willing to help out/read up, if you just help me identify where to start.

Thanks,
   André Eisenbach
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