Bug#423015: SMBus controller no longer recognised by Etch.

[Pierre Brial <p.brial@orange.fr>]

Package: kernel
Version: 2.6.18-4-686

Issue : The SMBus controller is no longer recognised by Etch.

A Debian 4.0 "Etch" have been installed on a Desktop PC (Motherboard 
Asus P4B533) which previously ran on Sarge.
The mbmon hardware monitor program didn't suceeded to access to the 
sensors, despite the fact that it worked perfectly on Sarge :

# mbmon -d
No Hardware Monitor found!!
InitMBInfo: Success

The system was rebooted on a knoppix 3.8.1 live-CD (kernel 2.6.11), and 
here mbmon works :

# mbmon -d
Using SMBus access method[Intel8XX(ICH/ICH2/ICH3/ICH4/ICH5/ICH6)]!!
Asus chip ASB100(Bach) found

If I do lspci with the knoppix live CD I've got the lines :

...
0000:00:1f.1 IDE interface: Intel Corp. 82801DB/DBL (ICH4/ICH4-L) 
UltraATA-100 IDE Controller (rev 01)
0000:00:1f.3 SMBus: Intel Corp. 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) 
SMBus Controller (rev 01)
0000:01:00.0 VGA compatible controller: nVidia Corporation: Unknown 
device 00f1 (rev a2)
...

We can see here the Intel SMBus controller.

If I do lspci under Debian Etch don't have any SMBus line, and no other 
peripheral at address 00:1f.3 :

# lspci -M -s 00:1f
00:1f.0 ISA bridge: Intel Corporation 82801DB/DBL (ICH4/ICH4-L) LPC 
Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801DB (ICH4) IDE Controller 
(rev 01)
pcilib: Cannot open /sys/bus/pci/devices/0000:00:1f.2/config
pcilib: Cannot open /sys/bus/pci/devices/0000:00:1f.3/config
pcilib: Cannot open /sys/bus/pci/devices/0000:00:1f.4/config
...

The fact that the Intel SMbus controller is undetected prevents 
monitoring programs like mbmon to access the temperature and voltage 
sensors of the motherboard.


All the best
Pierre Brial