[lm-sensors] PnP and W83627HF/W83781D IO port conflict at

[khali@linux-fr.org (Jean Delvare)]

Hi Salah,

> My motherboard, an ASUS P4B-LX has a W83627HF chip on it (as detected
> by sensors-detect) that has the sensor reading on it,and more
> importantly, allow control of the fan via PWM.
> 
> However, the W83781D module does not work - it loads, but nothing
> happens. When i2c debugging message are enabled, it print the error
> message "Request of region 0x290-0x297 for w83781d failed", although
> it still loads. In
> /proc/ioports it shows "pnp 00:0d" at port 0x0295-0x0296 both with and
> without the module loaded.
> 
> Forcing it gives the same error and results. Passing
> pnp_reserve_io=0x0290,8 in the command line has no effect, and no
> error message or acknowlegement about the parameter either, even with
> PNP Debug output.
> 
> If PNP is disabled in the kernel, I can access the sensor, get the
> sensors readings, and control the fan.

The culprit isn't PNP itself but PNPACPI. The problem is known, see:
  http://bugzilla.kernel.org/show_bug.cgi?id@14

Feel free to add a "me too" there so that the person responsible for it
knows that it does annoy people. Not sure there is anything we can do
though, as this is a BIOS bug. Ideally the motherboard manufacturer
should release an updated BIOS.

-- 
Jean Delvare