Re: [ACPI-sppt] ASUS M2400N update

Hi Luca,

> on 21/09/2003 10.24, Robert Vollmert wrote:
> >I modified the DSDT to completely turn off automatic fan control and
> >added methods for getting/setting the fan speed, and modified the
> >acpi4asus kernel module to include a file "fan" for setting the speed
> >manually. I can send you the patches if you're interested.
> Please, send me the patch for the 'acpi4asus' kernel module (I've 
> version 0.26, where there's the support for ASUS M3N).

note that what I describe above is what I did to find out sensible
values for the fan -- it's not what's in the last DSDT I posted.

> On the other hand, I tried your last DSDT on my M3N and it seems it 
> doesn't work as in your case. So, I trying to modify mine basing on your 
> modifications. Just some questions:

What doesn't work for you?

> - could you tell me what exactly you have enabled and what not? I mean, 
> should I enable the 'fan' ACPI module or only the 'thermal' one?

I'm not sure whether those modules need to be enabled at all. The
'fan' module is not much use since the DSDT (original and custom)
don't behave the way the fan module expects, as far as I can tell. In
the ACPI spec, a multi-level fans are actually implemented as multiple
fan devices, and it is left to the OS to turn these on and off
depending on the thermal zone trip-points, while in the ASUS DSDT, the
fan speed is controlled automatically based on the trip-points and
temperature. As far as I can tell, that is.

I'm not sure how necessary it is to load the 'thermal' module. I
suspect shutdown at the critical threshold temperature will only
happen if it is loaded. Also, you need it to check the temperature and
to change the cooling mode (active/passive, watch the trip-points
change).

> - the modifications you made to your last DSDT are only those where you 
> added C-style comments, right? Because I found some differences in the 2 
> (M2N and M3N) DSDTs... If you want to see the M3N one, you can grab it 
> at the ACPI DSDT db, I added it yesterday in section ASUS/M3N.

No, in addition to the comments, it now has hard-coded values for the
threshold temperatures and fan speeds, so that

> - in the future could it be possible reaching an automatic fan control 
> as on Windows?

automatic fan control should actually work. Does here, at least.

I'll have a look at the M3N DSDT later. By the way, does
display-switching work for you?

Cheers
Robert



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