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

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

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>

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 

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

emmajane@debian:~$ cat /proc/acpi/thermal_zone/THRC/trip_points 
critical (S5):           100 C
passive:                 86 C: tc1=2 tc2=5 tsp=300 devices=0xc12c5a40 

the fan directory is empty

the following modules are loaded:
emmajane@debian:~$ lsmod
Module                  Size  Used by    Tainted: P  
button                  2348   0 (unused)
battery                 5888   0 (unused)
ac                      1792   0 (unused)
fan                     1536   0 (unused)
thermal                 6624   0 (unused)
processor               8600   0 [thermal]

	
-- 
Emma Jane Hogbin
[[ 416 417 2868 ][ www.xtrinsic.com ]]


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