On 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. > Or 2a): Don't create sysfs entries for a fan if its mode value is invalid (reserved). Guenter _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
