Re: Datasheet for Fintek F71868a

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On 02/28/2016 10:36 AM, Fulcrum wrote:

On 02/29/2016 01:54 AM, Guenter Roeck wrote:

The kernel log should tell you when you load the driver without force_id.

I tried loading the driver without force_id, and it did work. I learnt
about force_id for this chip in some forum post, and never thought of loading the driver without force_id. Here are the kernel logs (dmesg):

[25369.887005] f71882fg: Found f71868a chip at 0x290, revision 48
[25369.887150] f71882fg f71882fg.656: Fan: 1 is in duty-cycle mode
[25369.887177] f71882fg f71882fg.656: Fan: 2 is in duty-cycle mode
[25369.887202] f71882fg f71882fg.656: Fan: 3 is in duty-cycle mode

There was no chip id in dmesg logs though.

It tells you the chip name, so it isn't considered to be necessary.

If sensors-detect provides the chip name, its ID is recognized.
Here is the f71868a related output from sensors-detect:

Driver `to-be-written':
* ISA bus, address 0x295
Chip `Fintek F71868A Super IO Sensors' (confidence: 9)

Note: there is no driver for Fintek F71868A Super IO Sensors yet.
Check for updates.

No chip id here either.

Are you sure the driver doesn't load without force_id ?
If so, do you see a message in the kernel log ? What does it say ?
There should be something like
     f71882fg: Unsupported Fintek device: <hex ID>
in the log.

Does work without force_id.

No, this is not an auto-loading driver. The kernel does not support auto-loading
Super-IO chip drivers. In case you wonder: It shouldn't, because Super-IO chip
detection is not well defined. Running sensors-detect is critical enough; even
that asks you and says "This is _usually_ safe" (emphasis added). We don't really
want to do this automatically with every boot.

I didn't know about auto-loading problem with Super-IO chip drivers.
This fact and the faulty output from sensors-detect were the reasons
behind this long convesation. LOL

Glad I could help. On mystery solved, thousands to go ;-)

Thanks a lot for helping me and this information.

My pleasure.


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