2011/9/8 Guenter Roeck <guenter.roeck@xxxxxxxxxxxx>
Or 2a): Don't create sysfs entries for a fan if its mode value isOn Thu, 2011-09-08 at 16:32 -0400, Hans de Goede wrote:
> Hi,
>
> First of all please those drop the list from the To / CC
> list, if you start a discussion on the list it is sort
> of list reader friendly to also finish it there.
>
> On 09/08/2011 09:07 PM, Daniel Schenkenberger wrote:
> > dmesg says:
> >
> > [ 216.007958] f71882fg: Found f71862fg chip at 0x290, revision 18
> > [ 216.008806] ACPI: resource f71882fg [io 0x0290-0x0297] conflicts with ACPI r egion IP__ [io 0x295-0x296]
> > [ 216.012580] f71882fg f71882fg.656: Invalid (reserved) pwm settings: 0x01
> >
> > i added "acpi_enforce_resources=lax" to my grub. if i boot without this the module won't load.
>
> That is not necessarily a good idea, see:
> http://www.lm-sensors.org/wiki/FAQ/Chapter3#Mysensorshavestoppedworkinginkernel2.6.31
>
> To quote myself from that page: "a really bad idea and can cause all sort of issues
> (including things like changing CPU / RAM voltage or clock speed)."
>
> So be warned!
>
> Now back to the problem, which is:
> [ 216.012580] f71882fg f71882fg.656: Invalid (reserved) pwm settings: 0x01
>
> Reading the data sheet, this means that the pwm settings for
> fan 2 and 3 are: 00 and 00, where as fan 1 has 01. The data sheet gives
> the following table for these:
>
> 00: Reserved
> 01: Auto fan speed control, fan speed will follow different temperature by
> different duty cycle (voltage) that define in 0xB6-0xBE.
> 10: Reserved
> 11: Manual mode fan control, user can write expect duty cycle (PWM fan
> type) or voltage(linear fan type) to 0xC3, and F71883FG will output this
> value duty or voltage to control fan speed.
>
> Never mind the F71883FG in there, this really if from the F71862FG datasheet
> (copy paste error in the data sheet), see:
> http://www.fintek.com.tw/eng/products.asp?BID=1&SID=17
>
> So the driver bails because something, likely the BIOS on your board has
> written an illegal value to the Fan mode Select Register.
>
> I guess the BIOS only setups fan 1 and the *cough* brilliant *cough* BIOS
> developers decided to just write 00 as value for the other fans, sigh.
>
> There are really 2 things we can do here:
> 1) Overwrite the BIOS settings, tricky, could do this with a module option
> 2) Instead of not binding the driver at all, allow the driver initialization
> to continue normally, but don't register the pwm interface. This requires
> some thinking wrt modifying the code a bit though.
>
> 1 is a really bad idea IMHO, so I'll think a bit about doing 2.
>
invalid (reserved).
Guenter
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