Re: ACPI issues - suspend-to-ram and processor speed

[Mathieu LESNIAK <maverick-uEz9PMp7chasTnJN9+BGXg@public.gmane.org>]

Hello,

I confirm what Andre have said : I've got a Presario 2118EA (quite same 
model with AMD Athlon XP1800). Suspend to ram hav never worked for me. 
It suspends but cannot resume (2 seconds after the wake up, the laptop 
shuts down)
I suspected acpid to catch the power button press and tell the laptop to 
shut down, but after disabling it, no more luck...

Regarding the CPU slowdown, I've seen similar behaviour under Windows. I 
think it's related to the laptop itself, maybe as Pavel Machek said on 
LKML, it's the lack of power that force the laptop to run in this mode.

Mathieu LESNIAK

Andre Eisenbach wrote:
> 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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