Bug 50975 - i2c/sensors kernel modules do not allow to detect/use LM78 on an INTEL PR440FX main board
Summary: i2c/sensors kernel modules do not allow to detect/use LM78 on an INTEL PR440F...
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
(Show other bugs)
Version: 9
Hardware: i386 Linux
Target Milestone: ---
Assignee: Arjan van de Ven
QA Contact: Brock Organ
Depends On:
TreeView+ depends on / blocked
Reported: 2001-08-05 21:03 UTC by Joachim Frieben
Modified: 2007-04-18 16:35 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2003-06-06 16:35:28 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Joachim Frieben 2001-08-05 21:03:44 UTC
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Description of problem:
The i2c/sensors kernel modules (v 2.5.5) included in kernel 2.4.6-3.1 do
not allow to detect/use the LM78 hardware monitoring chip on an INTEL
PR440FX mainboard which is controlled via the ISA bus. The corresponding
(necessary) modules are i2c-core.o, i2c-isa.o, sensors.o and lm78.o.

How reproducible:

Steps to Reproduce:
1. execute 'sensors-detect'
2. modprobe lm78
3. modprobe i2c-isa
4. execute 'sensors'

Actual Results:  Execution of 'sensors-detect' yields:

... Some chips are also accessible through the ISA bus. ISA probes are
typically a bit more dangerous, as we have to write to I/O ports to do
this.  Do you want to scan the ISA bus? (YES/no): 
Probing for `National Semiconductor LM78'
  Trying address 0x0290... Failed! ...

After loading kernel modules and executing 'sensors', one obtains:

 No sensors found!

Expected Results:  ... Probing for `National Semiconductor LM78'
  Trying address 0x0290... Success!
    (confidence 7, driver `lm78') ...

Additional info:

After compiling version 2.6.0 of i2c and lm_sensors based on source tree
linux-2.4.6-3.1, 'sensors-detect' detects correctly the LM78 chip, and
after loading kernel modules i2c-proc.o and lm78.o of version 2.6.0 instead
of kernel modules sensors.o and lm78.o of version 2.5.5, execution of
'sensors' yields the expected result!

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