i2c: lost sensors with 2.6.10(-mm1)

[jamagallon@able.es (J.A. Magallon)]

On 2005.01.07, Jean Delvare wrote:
> J.A. Magallon wrote:
> 
> > I have lost my sensors info with 2.6.10, in particular -mm1.
> > They work fine with 2.6.9-mm1 (current state of the box, booted on
> > 2.6.9 or 10, no other difference).
>  > (...)
> > I have noticed different contents in /sys:
> > under 2.6.9:
> > /sys/devices/platform/i2c-1:
> > /sys/devices/platform/i2c-1/1-0290:
> > /sys/devices/platform/i2c-1/1-0290/power:
> > /sys/devices/platform/i2c-1/power:
> > 
> > under 2.6.10:
> > /sys/devices/platform/i2c-1:
> > /sys/devices/platform/i2c-1/power:
> > 
> > So some /sys nodes are missing !!!
> > (the isa bus)
> 
> This basically means that the i2c client was not registered.
> 
> > Debug output from 2.6.10-mm1:
> > (...)
> > Jan  7 01:33:11 werewolf kernel: i2c-core: driver w83627hf registered.
> > Jan  7 01:33:11 werewolf kernel: i2c_adapter i2c-1: found normal isa entry for adapter 9191, addr 0290
> 
> However, this suggests that the driver loaded properly and the base 
> address was correctly read from Super-I/O space. This would mean that 
> the problem happened later, in w83627hf_detect(). The most likely reason 
> for this would be if the region request failed (unfortunately we have no 
> message, not even debug, if this happens).
> 
> > Some ideas ?
> 
> Three things to try, in order:
> 
> 1* Compare /proc/ioports in 2.6.9-mm1 and 2.6.10-mm1. I suspect that the 
> 0x290-0x297 range is held by some device in 2.6.10-mm1.
> 

Disabling "Plug and Play ACPI support" freed the ioport range and sensors
worked again.

Thanks for the info.

Is this a problem/conflict ? Or I can't use PnP-ACPI (if I ever guess
what is it useful for) and sensors at the same time ?

TIA

--
J.A. Magallon <jamagallon()able!es>     \               Software is like sex:
werewolf!able!es                         \         It's better when it's free
Mandrakelinux release 10.2 (Cooker) for i586
Linux 2.6.10-jam2 (gcc 3.4.3 (Mandrakelinux 10.2 3.4.3-2mdk)) #1

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