On Sat, Feb 04, 2012 at 06:08:59PM +0000, dab wrote:
> Package: lm-sensors
> Version: 1:3.1.2-6
> Severity: important
> 
> Hello,

Hi,

> I today updated the kernel of this box from lenny to squeeze. The problem
> is, that now sensors doesn't woek anymore and sensors-detect can not find
> any sensors anymore. If I reboot back to the old kernel (2.6.26) everything
> works fine again. I am not sure if that is the problem of lmsensors or the
> kernel-package, so if the bug is wrong here, please move it or just tell me.

That's really likely to be a kernel issue, that said keeping the problem
on the lm-sensors package is probably the best if you want to see some
progress there. When we have a better idea about the problem, we can
reassign it.

> Below you find the output of sensors-detect of the old and the new kernel. I
> also discovered that the via82cxxx-module is not longer in the kernel, but I

via82cxxx-module has nothing to do with sensors, it's the module for the
IDE controller. It's not there in kernel 2.6.32 as it has been switched to
libata (/dev/sda instead of /dev/hda), but pata_via replaces it instead.

> am unsure if that is a problem. If you have any questions or need more data,
> just ask.

It really look like the i2c-viapro module doesn't work correctly on your
system. What could be the problem is that the BIOS of your motherboard
accesses the sensors for example to control the speed of the CPU fan,
and recent version of the i2c-viapro modules forbids that (using
informations from ACPI) to avoid lock-up issues.

The best way to start would be to load the i2c-viapro module in both
2.6.26 and 2.6.32 kernels and look at the reported kernel messages.
The best is to first remove the module and then load it again so that
the messages are not lost in the middle of the others. So in short, can
you send me the output of the following command on both kernels?

  rmmod i2c-viapro ; modprobe i2c-viapro ; dmesg | grep tail

Aurelien

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
aurel...@aurel32.net                 http://www.aurel32.net



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