Re: [ACPI-sppt] fan speed control techniques (again)

On Tue, Jul 08, 2003 at 05:11:42PM -0400, Emma Jane Hogbin wrote:
> http://www.analog.com/library/analogDialogue/archives/34-04/fan/
> I thought this was an interesting article. I'm not sure how much of it has
> been implemented in the Linux stuff, but it was pretty easy to read. (Yes,
> it's old.) I noticed that it said my fan shouldn't be turned on until 60C,
> but the fan is currently on at:
> 
> emmajane@debian:~$ acpi -t
>      Thermal 1: ok, 54.0 degrees C
>      Thermal 2: ok, 49.0 degrees C
> 
> I noticed in a patch changelog that I found that:
> <[email protected]>
>    ACPI: Fix thermal management and make trip points R/W (Pavel Machek
> http://www.linuxhq.com/kernel/changelog/v2.5/42/
> Does this mean that the "trip points" don't work with the 2.4.20 patched
> kernel and that's why the fan is on at the wrong time?
> 
> Related acpi-support threads:
> http://sourceforge.net/mailarchive/forum.php?thread_id=2725927&forum_id=7803
> having the BIOS control the fan

Ah, the asus.  I just got one asl btw.  Seems to be interresting...

> 
> http://sourceforge.net/mailarchive/forum.php?thread_id=2713262&forum_id=7803
> SpeedStep settings
> 	My system was configured to "automatic" but is now configured to use
> 	"battery". The fan is still on at the following temperatures:
> 	
> 	emmajane@debian:~$ acpi -t
>      Thermal 1: ok, 51.0 degrees C
>      Thermal 2: ok, 46.0 degrees C
> 
> Does anyone know if this is because I'm using an old kernel + patch? Or is
> there something else I've missed?
> 
> thanks,
> emma :)
> 
> emmajane@debian:~$ cat /proc/acpi/processor/CPU0/info 
> processor id:            0
> acpi id:                 1
> bus mastering control:   yes
> power management:        yes
> throttling control:      yes
> performance management:  yes
> limit interface:         yes
> emmajane@debian:~$ cat /proc/acpi/processor/CPU0/limit 
> active limit:            P0:T0
> platform limit:          P0:T0
> user limit:              P0:T0
> thermal limit:           P0:T0
> emmajane@debian:~$ cat /proc/acpi/processor/CPU0/performance 
> state count:             2
> active state:            P0
> states:
>    *P0:                  1800 MHz, 0 mW, 250 uS
>     P1:                  1200 MHz, 0 mW, 250 uS
> emmajane@debian:~$ cat /proc/acpi/processor/CPU0/            
> info         limit        performance  power        throttling   
> emmajane@debian:~$ cat /proc/acpi/processor/CPU0/power 
> active state:            C2
> default state:           C1
> bus master activity:     ffffffff
> states:
>     C1:                  promotion[C2] demotion[--] latency[000]
> usage[00025440]
>    *C2:                  promotion[C3] demotion[C1] latency[020]
> usage[00794979]
>     C3:                  promotion[--] demotion[C2] latency[200]
> usage[00000000]
> emmajane@debian:~$ cat /proc/acpi/processor/CPU0/throttling 
> state count:             8
> active state:            T0
> states:
>    *T0:                  00%
>     T1:                  12%
>     T2:                  25%
>     T3:                  37%
>     T4:                  50%
>     T5:                  62%
>     T6:                  75%
>     T7:                  87%
> 
> 
> 
> emmajane@debian:~$ cat /proc/acpi/thermal_zone/THRS/cooling_mode 
> cooling mode:            active
> 
> emmajane@debian:~$ cat /proc/acpi/thermal_zone/THRS/polling_frequency 
> <polling disabled>

Try to echo 300 > polling_frequency
Then passvie via polling will be *really* activated.

> 
> emmajane@debian:~$ cat /proc/acpi/thermal_zone/THRS/state             
> state:                   ok
> 
> emmajane@debian:~$ cat /proc/acpi/thermal_zone/THRS/temperature 
> temperature:             48 C
> 
> emmajane@debian:~$ cat /proc/acpi/thermal_zone/THRS/trip_points 
> critical (S5):           92 C
> passive:                 80 C: tc1=2 tc2=5 tsp=300 devices=0xc12c5a40 

There is a 'magical' thing in order to change the 80C, but I do not
remember the exact syntax.  Should be documented somewhere (at
least in the source :)

> 
> (all THRC values are the same except the following)
> emmajane@debian:~$ cat /proc/acpi/thermal_zone/THRC/temperature 
> temperature:             45 C

Same.  You may want to really activate passive mode via polling
by echoing to polling_frequency.


Cheers,

-- 
Ducrot Bruno

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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