[lm-sensors] it8712 rev 7; fan speeds reported incorrectly.

John Gumb john.gumb at tandberg.com
Mon Sep 15 13:03:19 CEST 2008


Hi

 

I've just picked up linux-2.6.27-rc5 and it would appear fan speeds are
reported incorrectly now. We have it8712  rev7 on our systems. We see
speeds of around 40K RPM (!!).

 

The following hack fixes it - it just punts 16 bit fan support out to
rev8. It would appear our it8172 does not have 16 bit tacho support. Or
if it does, the driver isn't enabling it properly.

 

--- drivers/hwmon/it87.c.orig   2008-09-05 15:51:11.000000000 +0100

+++ drivers/hwmon/it87.c        2008-09-05 15:51:53.000000000 +0100

@@ -283,7 +283,7 @@

           IT8712F Datasheet 0.9.1, section 8.3.5 indicates 7h ==
Version I.

           These are the first revisions with 16bit tachometer support.
*/

        return (data->type == it87 && data->revision >= 0x03)

-           || (data->type == it8712 && data->revision >= 0x07)

+           || (data->type == it8712 && data->revision >= 0x08)

            || data->type == it8716

            || data->type == it8718;

 

Cheers

 

John

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