Re: [lm-sensors] f71882fg not showing motherboard temps

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 11/02/2012 09:04 PM, Logan Freijo wrote:
> On 11/2/2012 12:28 PM, Hans de Goede wrote:
>> Hi,
>>
>> On 11/02/2012 02:22 PM, Logan Freijo wrote:
>>> On 11/2/2012 5:09 AM, Hans de Goede wrote:
>>>> Hi,
>>>>
>>>> On 11/02/2012 06:29 AM, Logan Freijo wrote:
>>>>
>>>> <snip>
>>>>
>>>>> Device 09 no longer shows up.
>>>>> ls -lR /sys/bus/pnp/devices/00\:09/
>>>>> and
>>>>> cat /sys/bus/pnp/devices/00\:09/id
>>>>> return "No such file or directory"
>>>>>
>>>>
>>>> Yeah, that is due to the pnpacpi=off option you
>>>> are using, please boot without that (or any other
>>>> special options), and then repeat the 2 above
>>>> commands. This will give us an idea if it will be
>>>> feasible to fix this in a way which will not
>>>> require passing those special kernel cmdline
>>>> options.
>>>>
>>>> Regards,
>>>>
>>>> Hans
>>>>
>>> Alright. Here is ls -lR /sys/bus/pnp/devices/00\:09/
>>>
>>> /sys/bus/pnp/devices/00:09/:
>>> total 0
>>> lrwxrwxrwx 1 root root    0 Nov  2 09:18 driver -> ../../../bus/pnp/drivers/system
>>> lrwxrwxrwx 1 root root    0 Nov  2 09:18 firmware_node -> ../../LNXSYSTM:00/device:00/PNP0A03:00/device:17/PNP0C02:03
>>> -r--r--r-- 1 root root 4096 Nov  2 09:18 id
>>> -r--r--r-- 1 root root 4096 Nov  2 09:18 options
>>> drwxr-xr-x 2 root root    0 Nov  2 09:18 power
>>> -rw-r--r-- 1 root root 4096 Nov  2 09:18 resources
>>> lrwxrwxrwx 1 root root    0 Nov  2 09:17 subsystem -> ../../../bus/pnp
>>> -rw-r--r-- 1 root root 4096 Nov  2 09:17 uevent
>>>
>>> /sys/bus/pnp/devices/00:09/power:
>>> total 0
>>> -rw-r--r-- 1 root root 4096 Nov  2 09:18 async
>>> -rw-r--r-- 1 root root 4096 Nov  2 09:18 autosuspend_delay_ms
>>> -rw-r--r-- 1 root root 4096 Nov  2 09:18 control
>>> -r--r--r-- 1 root root 4096 Nov  2 09:18 runtime_active_kids
>>> -r--r--r-- 1 root root 4096 Nov  2 09:18 runtime_active_time
>>> -r--r--r-- 1 root root 4096 Nov  2 09:18 runtime_enabled
>>> -r--r--r-- 1 root root 4096 Nov  2 09:18 runtime_status
>>> -r--r--r-- 1 root root 4096 Nov  2 09:18 runtime_suspended_time
>>> -r--r--r-- 1 root root 4096 Nov  2 09:18 runtime_usage
>>>
>>
>> Good, no other drivers are using this pnp-id, but:
>>
>>>
>>> And  cat /sys/bus/pnp/devices/00\:09/id
>>>
>>> PNP0c02
>>
>> But this is bad news, this is the general pnp ID for reserving
>> resources, without specifying a driver to use them ...
>>
>> This could mean that your ACPI code is using the device, and
>> the firmware authors are reserving it in a funky way. More likely
>> this is just a BIOS misfeature of some sorts...
>>
>> Anyways there is little we can do here to fix things, as we can
>> not make the f71882fg driver claim that pnp id.
>>
>> Regards,
>>
>> Hans
>>
> Hello,
>
> Thanks for looking into this further Hans. Is there any adverse effect to using the pnpacpi=off option?

Now a days not really, since there is little ISA stuff left in a modern PC, and what
is there usually is detected fine without isapnp too, since it has been at the
same isa address since the beginning of time (ie serial ports, if you're lucky enough
to have a serial port on your motherboard). However if in the future you think:
"hey why is Linux not seeing my foobar hardware" where by foobar is something
ancient like say a floppy controller, try removing the option. Note this is all
AFAIK, this is veering away a bit from my area of expertise (which is certain hwmon
chips and usb).

 > Is it possible there is a CMOS option that will disable the BIOS use of this resource?

Not likely.

Regards,

Hans

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