[Debian-eeepc-devel] debian on eeepc 1201N : Pb with smbus nforce2

[giggzounet]

2010/1/7 Alan Jenkins <sourcejedi.lkml at googlemail.com>

> On 1/6/10, giggzounet <giggzounet at gmail.com> wrote:
> > Hi,
> >
> > With the kernel of lenny bakcport 2.6.30 the module i2c_nforce2 loads
> > without problem : in dmesg I see :
> >
> > [    6.569759] i2c-adapter i2c-0: nForce2 SMBus adapter at 0x4d00
> > [    6.569905] i2c-adapter i2c-1: nForce2 SMBus adapter at 0x4e00
> >
> >
> > With the 2.6.32.2 I see :
> > [    3.842775] i2c i2c-0: nForce2 SMBus adapter at 0x4d00
> > [    3.842861] ACPI: I/O resource nForce2_smbus [0x4e00-0x4e3f]
> > conflicts with ACPI region SM00 [0x4e00-0x4e3f]
> > [    3.842949] ACPI: If an ACPI driver is available for this device, you
> > should use it instead of the native driver
> > [    3.843036] nForce2_smbus 0000:00:03.2: Error probing SMB2.
> >
> >
> > What can I do in order to solve this problem ?
>
> It's only a problem if you have hardware monitoring sensors you want
> to use on that bus, for whatever reason.
>
> If you know the kernel is being over-cautious because you've inspected
> the DSDT etc. and found that the ACPI BIOS doesn't actually use the
> SM00 region, then you want "acpi_enforce_resources=lax".  (
>
> If you want to see an example of a ACPI hwmon driver, look at the Asus
> ATK0110.
>
> The third possibility is that the ACPI BIOS uses the sensors for
> internal purposes but exposes no interface.  Or more realistically, it
> exposes it as an ACPI thermal zone, but omits information like
> voltages that you're interested in.
>
> The kernel has to respect these ACPI resource reservations.
> Conflicts between the BIOS and kernel driving the same hardware can
> cause mysterious slowdowns and worse (and have done so on other EeePC
> models).
>

Ok thx for your explanation.

What I found strange is : I don't have any error messages with the 2.6.30
and I get this error message with 2.6.32. Also perhaps a driver does
something wrong...

Cheers,
Guillaume
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