mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-10-16 10:49:31 +00:00
Jean Delvare
e37c58cccd
suspend/resume. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@4294 7894878c-1315-0410-8ee3-d5d059ff63e0
110 lines
3.3 KiB
Plaintext
110 lines
3.3 KiB
Plaintext
What is it?
|
|
-----------
|
|
|
|
It unhides the SMBus of Intel ICH southbridges hidden
|
|
on ASUS P4B series. It is implemented as a module (p4b_smbus.o),
|
|
or a shell script for the 2.6 kernel (unhide_ICH_SMBus).
|
|
|
|
It works with the following chips:
|
|
* ICH2 (82801BA)
|
|
* ICH2-M (82801BAM)
|
|
* ICH4 (82801DB)
|
|
* ICH4-M (82801DBM)
|
|
* ICH5 (82801EB)
|
|
|
|
ASUS switches off the SMBus PCI Device in the i801 ICH chip. I spoke twice
|
|
with the German support and learned that: "We do not want the users to be
|
|
irritated by just another PCI Device in the Win98 device manager."
|
|
Really funny :-).
|
|
|
|
This module is for 2.4 kernels only. For 2.6 kernels, activation is
|
|
handled by the code in drivers/pci/quirks.c in the kernel source. If you
|
|
have the 2.6 kernel and the quirks code does not activate your SMBus,
|
|
you may:
|
|
|
|
* check if you have kernel version from 2.6.17 to 2.6.19
|
|
If so you, need to disable ACPI sleep support and recompile kernel.
|
|
If you don't use suspend try below instead of recompilation.
|
|
|
|
* run as root the ./unhide_ICH_SMBus script. It will unhide the bus
|
|
and load the i2c-i801 driver. Beware that you should then no longer
|
|
use system suspend as bad things might happen on resume.
|
|
|
|
* if above script works and you have latest kernel, you may
|
|
try to fix the quirks.c, recompile and test your new kernel,
|
|
and then submit a patch to us. Contact us if you need assistance.
|
|
|
|
Information for 2.4 users continues below.
|
|
|
|
NOTE: As of kernel 2.4.23, the kernel activates the SMBus PCI device
|
|
on the following boards:
|
|
* Asus P4B
|
|
* Asus P4B533
|
|
* Asus P4PE
|
|
* Asus P4T533
|
|
* Asus P4G8X Deluxe
|
|
So this module is no longer required for these boards. For the other
|
|
affected boards, it still is.
|
|
|
|
What does the module do?
|
|
------------------------
|
|
(Note: the following instructions assume the ICH2. For the ICH4,
|
|
the PCI IDs are 24C0 and 24C3)
|
|
|
|
It turnes off (!) the bits number 8 and 3 in the LPC register of the ICH2.
|
|
This you can also try as root with setpci and pcitweak.
|
|
First do a:
|
|
|
|
setpci -d 8086:2440 f2.w
|
|
|
|
You will get an hex number VAL - in my case 148 (Hex)-, where you have to
|
|
erase the two bits - in my case you get 40 (Hex).
|
|
Then do a:
|
|
|
|
setpci -d 8086:2440 f2.w=VAL
|
|
|
|
Running "lspci -n" you will not see any new device, but with "pcitweak -l" you
|
|
should get a line similar to this in the output:
|
|
|
|
PCI: 00:1f:3: chip 8086,2443 card 1043,8028 rev 12 class 0c,05,00 hdr 00
|
|
|
|
The important thing is the "8086,2443" here.
|
|
The device is activated, but not included in /proc/pci and
|
|
/proc/bus/pci/devices. This is the reason for running the module.
|
|
|
|
What are the system requirements?
|
|
---------------------------------
|
|
|
|
- Obviously a board with Intel i801BA/DB/EB ICH2/4/5 with broken BIOS.
|
|
- A linux working with a 2.4 kernel AND hotplug support in it!
|
|
- A installed kernel tree and gcc.
|
|
- i2c and sensor modules installed.
|
|
|
|
How to install?
|
|
---------------
|
|
|
|
Simply do a:
|
|
|
|
make -f Makefile.p4b
|
|
insmod p4b_smbus.o
|
|
modprobe i2c-core
|
|
modprobe i2c-i801
|
|
modprobe i2c-dev
|
|
modprobe i2c-proc
|
|
|
|
Then run your sensor:
|
|
|
|
modprobe w83781d
|
|
|
|
What should i never do?
|
|
-----------------------
|
|
|
|
Do not try to do a "rmmod p4b_smbus" before a "rmmod i2c-i801".
|
|
The other way around should be okay. Otherwise you remove the PCI device
|
|
without notifying the i2c driver.
|
|
|
|
|
|
-------------------------------
|
|
Ilja Rauhut <IljaRauhut@web.de>
|
|
|