Re: [Acpi4asus-user] ASUS M2400N / M3700N / S1300N temperature

[Mads Paulin <paulin-/w0Os/Ss2Sh/SzgSGea1oA@public.gmane.org>]

On Tue, 2003-08-19 at 16:03, Karol Kozimor wrote:
> Thus wrote Mads Paulin:
> > I have an ASUS M2400N and is trying to get the fan control right. Karol
> > solved the temperature reading problem, but due to wron thermal trip
> 
> Did I really? From what you said before, I understood it didn't work.
> Let's look at the code:
> #v+
>     Method (_TMP, 0, NotSerialized)
>     {
>         Store (0x05, Local1)
>         While (Local1)
>         {
>             Store (RTMP (), Local0)
>             If (LGreater (Local0, TCRT))
>             {
>                 Decrement (Local1)
>             }
>             Else
>             {
>                 Store (0x00, Local1)
>             }
>         }
> 
>         Return (KELV (Local0))
>     }
> [...]
>     Method (RTMP, 0, NotSerialized)
>     {
>         Store (RBYT (TSAD, 0x01), Local0)
>         If (Not (Local0))
>         {
>             Store (Local0, LTMP)
>         }
> 
>         Return (LTMP)
>     }
> #v-
> 
> This is the original one. If the (RBYT (TSAD, 0x01) is supposed to return
> temperature, it should rather not be zero. Thus, the condition in RTMP
> always fails. Since LTMP is initialized with 0x3c (60d), the _TMP method
> always returns (KELV (60)), and also, since RTMP is also used internally,
> the fan keeps spinning at the same speed. 
> 
> Now, if the aforementioned condition is changed to If (Local0), which looks
> fairly more reasonable, strange things begin to happen (like those trip
> points and temperature being reported as 255 degrees). There is nothing in
> the trip point code that would support such a behaviour, unless the change
> causes some random memory scribbling, or something similarly nasty.
> 
> > By the way, the fan is capable of rotationg at several different rpm's.
> > Have any of you gotten this rigt ? On my laptop, the fan starts at max
> > rpms and then turns completely off. The only way I can get it to rotate
> > at low RPMS is by rebooting the machine when the processor temperature
> > is in the interval giving low rpm's. The bios will then put the fan in
> > low rpm state.
> > 
> > This leads me to think, that the fan is not controlled by acpi at all
> > (possibly due to a buggy DSDT)
> 
> The fan is, and should be, controled by ACPI, though not in the way the
> specification says. The \_TZ.TCHG method compares the actual temperature
> adn stores appropriate values in the fan registers, causing it to change
> its speed. A very similar thermal system exists in ASUS L3800C, where it
> works quite well.

Yes - I agree - the fan is controlled by acpi, but I think the DSDT is
so buggy that acpi never turns on the fan (probably due to wrong
temperature reading) so that the bios takes over and makes emergency
cooling... Does this sound completely stupid ??

> 
> Could someone take a look in the M2400N DSDT and suggest a way to debug it?

Unfortunately I ain't much of a DSDT hacker, but if someone could join
up with me, I could probably get a hang of it pretty fast.... I just
need someone to get me startet...

Mads


> Best regards,
> 
> -- 
> Karol 'sziwan' Kozimor
> sziwan-DETuoxkZsSqrDJvtcaxF/A@public.gmane.org




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