[i2c] Macs with Intel 82801G (ICH7 Family)

[Brian C]

It seems that all the Macs (MacBook, MacBook Pro, iMac, Mac Mini) with
Intel chips use this 82801G chip.

See: http://www.mactel-linux.org/wiki/Lspci

I cannot get sensors-detect to detect anything. I'd particularly like to
monitor CPU temperature, if that's possible. Fan speed would be good too.

Here's some relevant output. Thanks for any help.

Some output from sensors-detect is currently at:
http://wiki.debian.org/MacBook

In my MacBook I also get:

lspci -v|egrep -e 'ISA|SMBus' -A3
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface
Bridge (rev 02)
        Subsystem: Intel Corporation Unknown device 7270
        Flags: bus master, medium devsel, latency 0
        Capabilities: [e0] Vendor Specific Information
--
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller
(rev 02)
        Subsystem: Intel Corporation Unknown device 7270
        Flags: medium devsel, IRQ 11
        I/O ports at efa0 [size=32]

lspci -n | grep 00:1f\.0
00:1f.0 0601: 8086:27b9 (rev 02)

lspci -n | grep 00:1f\.3
00:1f.3 0c05: 8086:27da (rev 02)

lsmod |grep i2c
i2c_dev                10144  0
i2c_i801               11148  0
i2c_core               22400  3 i2c_dev,eeprom,i2c_i801

sensors -v
sensors version 2.10.0 with libsensors version 2.10.0

sensors
Can't access procfs/sysfs file
Unable to find i2c bus information;
For 2.6 kernels, make sure you have mounted sysfs and libsensors
was compiled with sysfs support!
For older kernels, make sure you have done 'modprobe i2c-proc'!

cat /etc/fstab |grep sysfs
none            /sys            sysfs   defaults        0       0

dmesg |grep -i error
i801_smbus 0000:00:1f.3: Error: no response!
[repeated about 46 times]

I'm using a 2.6.17.6 kernel on Debian Etch and have not made any changes
to /etc/sensors.conf.

I'm glad to provide other information that would help troubleshoot the
relevant chip(s). Thanks for any help!

Brian