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

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

Ok - probably I was too optimistic there - sorry :-)

Just a mad idea: What happens if I try to use the ASUS L3800C DSDT on my
M2400N ? Does it blow up ??

Mads


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.
> 
> Could someone take a look in the M2400N DSDT and suggest a way to debug it?
> Best regards,
> 
> -- 
> Karol 'sziwan' Kozimor
> sziwan-DETuoxkZsSqrDJvtcaxF/A@public.gmane.org




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