OK, i searched, the internet with google and google/linux. I searched the mdk knowledge base. I had a look at this forum and i think it's the place i should put my question.
With mandrake10.0, i have a fragile asus p4c800 motherboard (once repaired under warranty) and i need to monitor temperature, cpu fan, etc... i installed acpi and gkrellm but was told that i need lm-sensors. I instaled it and ran sensors-detect. Then i run sensors but it doesn't work properly : gives only 2 inconsistent temperatures measures.
What comes when i run sensors :
lm75-i2c-0-48
Adapter: SMBus I801 adapter at 0400
temp: +125.0°C (high = +80.0°C, hyst = +75.0°C)

lm75-i2c-0-49
Adapter: SMBus I801 adapter at 0400
temp: +125.0°C (high = +80.0°C, hyst = +75.0°C)

eeprom-i2c-0-52
Adapter: SMBus I801 adapter at 0400
Memory type: DDR SDRAM DIMM
Memory size (MB): 256

eeprom-i2c-0-50
Adapter: SMBus I801 adapter at 0400
Memory type: DDR SDRAM DIMM
Memory size (MB): 256

Here is my lspci :
00:00.0 Host bridge: Intel Corp. 82875P Memory Controller Hub (rev 02)
00:01.0 PCI bridge: Intel Corp. 82875P Processor to AGP Controller (rev 02)
00:1d.0 USB Controller: Intel Corp. 82801EB USB (rev 02)
00:1d.1 USB Controller: Intel Corp. 82801EB USB (rev 02)
00:1d.2 USB Controller: Intel Corp. 82801EB USB (rev 02)
00:1d.3 USB Controller: Intel Corp. 82801EB USB (rev 02)
00:1d.7 USB Controller: Intel Corp. 82801EB USB2 (rev 02)
00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB/EB PCI Bridge (rev c2)
00:1f.0 ISA bridge: Intel Corp. 82801EB LPC Interface Controller (rev 02)
00:1f.1 IDE interface: Intel Corp. 82801EB Ultra ATA Storage Controller (rev 02)
00:1f.3 SMBus: Intel Corp. 82801EB SMBus Controller (rev 02)
00:1f.5 Multimedia audio controller: Intel Corp. 82801EB AC'97 Audio Controller (rev 02)
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon R300 ND [Radeon 9700 Pro]
01:00.1 Display controller: ATI Technologies Inc Radeon R300 [Radeon 9700 Pro] (Secondary)
02:03.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host Controller (rev 80)
02:04.0 RAID bus controller: Promise Technology, Inc.: Unknown device 3373 (rev 02)
02:05.0 Ethernet controller: 3Com Corporation 3c940 1000Base? (rev 12)
02:0d.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)

According to the mobo datasheet, there is a winbond w83627thf chip on this p4c800 deluxe. I understood, perhaps wrongly, that this chipset is handled via the intel 82801EB ICH5 southbridge (i2c-i801 driver).
Sensors detect has generated a /etc/sysconf/lm_sensors file that contains this :

# Generated by sensors-detect on Sun Jul 11 16:59:31 2004
MODULE_0=i2c-i801
MODULE_1=i2c-isa
MODULE_2=lm75
MODULE_3=eeprom
MODULE_4=smbus-arp
MODULE_5=w83627hf_wdt

I changed the last line because it had the ancient w83627hf module. I think i might have to pass some parameters to this module so that it works properly. But i don't know which ones...???
Here is my lsmod :
Module Size Used by
lm75 8644 0
w83627hf_wdt 6024 0
sg 40028 0
sr_mod 18116 0
binfmt_misc 11432 1
autofs4 17152 2
parport_pc 34304 1
lp 13256 0
parport 41032 2 parport_pc,lp
fglrx 167722 205
snd-seq-oss 33568 0
snd-seq-midi-event 8704 1 snd-seq-oss
snd-seq 55696 4 snd-seq-oss,snd-seq-midi-event
snd-pcm-oss 53316 0
snd-mixer-oss 19008 1 snd-pcm-oss
snd-intel8x0 34440 1
snd-ac97-codec 59588 1 snd-intel8x0
snd-pcm 97440 2 snd-pcm-oss,snd-intel8x0
snd-timer 26660 2 snd-seq,snd-pcm
gameport 5664 1 snd-intel8x0
snd-page-alloc 12996 2 snd-intel8x0,snd-pcm
snd-mpu401-uart 8320 1 snd-intel8x0
snd-rawmidi 25248 1 snd-mpu401-uart
snd-seq-device 9032 3 snd-seq-oss,snd-seq,snd-rawmidi
snd 55492 14 snd-seq-oss,snd-seq-midi-event,snd-seq,snd-pcm-oss,snd-mixer-oss,snd-intel8x0,snd-ac97-codec,snd-pcm,snd-timer,snd-mpu401-uart,snd-rawmidi,snd-seq-device
soundcore 10560 1 snd
md5 4864 1
ipv6 251392 12
af_packet 22632 8
eeprom 8328 0
i2c-sensor 3936 2 lm75,eeprom
i2c-isa 2848 0
i2c-i801 8880 0
i2c-core 24292 5 lm75,eeprom,i2c-sensor,i2c-isa,i2c-i801
hid 55360 0
raw 8640 1
ide-floppy 19776 0
ide-tape 36752 0
ide-cd 41764 0
cdrom 38272 2 sr_mod,ide-cd
floppy 61620 0
button 7064 0
thermal 14032 0
processor 14512 1 thermal
fan 4940 0
ac 5804 0
battery 10220 0
ipt_TOS 3232 12
ipt_REJECT 7456 4
ipt_pkttype 2528 4
ipt_LOG 6400 7
ipt_limit 3328 7
ipt_state 2720 13
ip_nat_irc 5136 0
ip_nat_tftp 4240 0
ip_nat_ftp 5776 0
ip_conntrack_irc 72148 1 ip_nat_irc
ip_conntrack_tftp 4340 0
ip_conntrack_ftp 72724 1 ip_nat_ftp
ipt_multiport 2848 0
ipt_conntrack 3296 0
iptable_filter 3616 1
iptable_mangle 3616 1
iptable_nat 24996 3 ip_nat_irc,ip_nat_tftp,ip_nat_ftp
ip_conntrack 33612 9 ipt_state,ip_nat_irc,ip_nat_tftp,ip_nat_ftp,ip_conntrack_irc,ip_conntrack_tftp,ip_conntrack_ftp,ipt_
conntrack,iptable_nat
ip_tables 18624 11 ipt_TOS,ipt_REJECT,ipt_pkttype,ipt_LOG,ipt_limit,ipt_state,ipt_multiport,ipt_conntrack,iptable_filte
r,iptable_mangle,iptable_nat
8139too 25760 0
mii 5984 1 8139too
sk98lin 161576 1
ohci1394 35684 0
ieee1394 290480 1 ohci1394
nls_utf8 2912 1
ntfs 87532 1
supermount 39856 1
intel-agp 18364 1
agpgart 32460 2 intel-agp
usb-storage 74596 0
usblp 13696 0
lirc_atiusb 11012 0
lirc_dev 14592 2 lirc_atiusb
ehci-hcd 25572 0
uhci-hcd 31856 0
usbcore 103228 8 hid,usb-storage,usblp,lirc_atiusb,ehci-hcd,uhci-hcd
rtc 13640 0
ext3 114216 6
jbd 61976 1 ext3
sd_mod 17696 0
sata_promise 14852 0
libata 40256 1 sata_promise,[permanent]
scsi_mod 117104 5 sg,sr_mod,usb-storage,sd_mod,libata


Should i install a new version of lm_sensors if there's one is about to be released by mdk ? Or download the tgz on the site and install it by myself ?
Should i keep the other modules : eeprom, lm75 ? smbus-arp , that doesn't exist anymore on kernel 2.6.3 ?
Should i load the other modules with some parameters ???
Thank you.

What i did to solve this problem :
I realised that the automatically generated /etc/sysconfig/lm_sensors was wrong because it said to load the w83627hf module, although this module does not exist in kernel 2.6.3 !
First i thought that it should be replaced by the w83627hf_wdt module. I didn't know at that time that it was not the good one to be used by lm_sensors.
After a search in /usr/src/linux (kernel source), i found the /usr/src/linux-2.6.3-15mdk/drivers/i2c/chips directory where seemed to be the drivers used by the sensors program and the /etc/sensors.conf. In this directory i read the file and i discovered that the suitable driver is : w83781d. And not w83627hf.
Now i managed to have the temperature and voltage monitor on my asus p4c800. But i still don't have any info about fan speed :
[--root@descartes 14:44:20 /sys/devices/platform/i2c-1/1-0290] ll -A
total 0
-r--r--r-- 1 root root 4096 jui 25 09:15 alarms
-rw-r--r-- 1 root root 4096 jui 25 09:15 beep_enable
-rw-r--r-- 1 root root 4096 jui 25 09:15 beep_mask
-rw-r--r-- 1 root root 4096 jui 25 09:15 detach_state
-rw-r--r-- 1 root root 4096 jui 25 09:15 fan_div1
-rw-r--r-- 1 root root 4096 jui 25 09:15 fan_div2
-rw-r--r-- 1 root root 4096 jui 25 09:15 fan_div3
-r--r--r-- 1 root root 4096 jui 25 09:15 fan_input1
-r--r--r-- 1 root root 4096 jui 25 09:15 fan_input2
-r--r--r-- 1 root root 4096 jui 25 09:15 fan_input3
-rw-r--r-- 1 root root 4096 jui 25 09:15 fan_min1
-rw-r--r-- 1 root root 4096 jui 25 09:15 fan_min2
-rw-r--r-- 1 root root 4096 jui 25 09:15 fan_min3
-r--r--r-- 1 root root 4096 jui 25 09:15 in_input0
-r--r--r-- 1 root root 4096 jui 25 09:15 in_input1
-r--r--r-- 1 root root 4096 jui 25 09:15 in_input2
-r--r--r-- 1 root root 4096 jui 25 09:15 in_input3
-r--r--r-- 1 root root 4096 jui 25 09:15 in_input4
-r--r--r-- 1 root root 4096 jui 25 09:15 in_input5
-r--r--r-- 1 root root 4096 jui 25 09:15 in_input6
-r--r--r-- 1 root root 4096 jui 25 09:15 in_input7
-r--r--r-- 1 root root 4096 jui 25 09:15 in_input8
-rw-r--r-- 1 root root 0 jui 25 09:15 in_max0
-rw-r--r-- 1 root root 0 jui 25 09:15 in_max1
-rw-r--r-- 1 root root 0 jui 25 09:15 in_max2
-rw-r--r-- 1 root root 0 jui 25 09:15 in_max3
-rw-r--r-- 1 root root 0 jui 25 09:15 in_max4
-rw-r--r-- 1 root root 4096 jui 25 09:15 in_max5
-rw-r--r-- 1 root root 4096 jui 25 09:15 in_max6
-rw-r--r-- 1 root root 0 jui 25 09:15 in_max7
-rw-r--r-- 1 root root 0 jui 25 09:15 in_max8
-rw-r--r-- 1 root root 0 jui 25 09:15 in_min0
-rw-r--r-- 1 root root 0 jui 25 09:15 in_min1
-rw-r--r-- 1 root root 0 jui 25 09:15 in_min2
-rw-r--r-- 1 root root 0 jui 25 09:15 in_min3
-rw-r--r-- 1 root root 0 jui 25 09:15 in_min4
-rw-r--r-- 1 root root 4096 jui 25 09:15 in_min5
-rw-r--r-- 1 root root 4096 jui 25 09:15 in_min6
-rw-r--r-- 1 root root 0 jui 25 09:15 in_min7
-rw-r--r-- 1 root root 0 jui 25 09:15 in_min8
-r--r--r-- 1 root root 4096 jui 25 09:15 name
drwxr-xr-x 2 root root 0 jui 25 09:15 power/
-rw-r--r-- 1 root root 4096 jui 25 09:15 pwm1
-rw-r--r-- 1 root root 4096 jui 25 09:15 pwm2
-rw-r--r-- 1 root root 4096 jui 25 09:15 pwm_enable2
-rw-r--r-- 1 root root 4096 jui 25 09:15 sensor1
-rw-r--r-- 1 root root 4096 jui 25 09:15 sensor2
-rw-r--r-- 1 root root 4096 jui 25 09:15 sensor3
-rw-r--r-- 1 root root 4096 jui 25 09:15 temp_hyst1
-rw-r--r-- 1 root root 4096 jui 25 09:15 temp_hyst2
-rw-r--r-- 1 root root 4096 jui 25 09:15 temp_hyst3
-r--r--r-- 1 root root 4096 jui 25 09:15 temp_input1
-r--r--r-- 1 root root 4096 jui 25 09:15 temp_input2
-r--r--r-- 1 root root 4096 jui 25 09:15 temp_input3
-rw-r--r-- 1 root root 4096 jui 25 09:15 temp_max1
-rw-r--r-- 1 root root 4096 jui 25 09:15 temp_max2
-rw-r--r-- 1 root root 4096 jui 25 09:15 temp_max3
-r--r--r-- 1 root root 4096 jui 25 09:15 vid
-rw-r--r-- 1 root root 4096 jui 25 09:15 vrm
[--root@descartes 14:44:21 /sys/devices/platform/i2c-1/1-0290] cat *input*
0
0
0
3072
3312
3280
3120
2912
0
0
3008
0
43000
38500
-48000

christophe.dr, please do not double post in future. thanks

sorry i didn't want to hurt...