Re: 2.6.10-mm2: it87 sensor driver stops CPU fan

[Simone Piunno <pioppo@ferrara.linux.it>]

On Tuesday 11 January 2005 10:26, Jean Delvare wrote:

> What you have here is this default configuration, i.e. all fans are
> supposedly off. Of course it isn't the case, I assume that your fans
> are running at full speed when you turn your computer on. 

Yes, thank you for your analisys.

> Additionally, the first fan control output was turned to manual PWM
> control mode, full speed. The driver supposedly doesn't do that, I
> guess you did it yourself through the sysfs interface?

Of course, sorry.

> > > Do you know what kind of it87 chip you do have? There are three of
> > > them, IT8705F, IT8712F and a SIS950 clone (mostly similar to the
> > > IT8705F).
> See /sys/bus/i2c/devices/0-0290/name. If it says it8712 it's an IT8712F,
> if it says it87 it is a less featured IT8705F or clone. After looking at

pioppo@roentgen ~ $ cat /sys/devices/platform/i2c-0/0-0290/name
it87

> 2* I would then add a check to the it87 driver, which completely disables
> the fan speed control interface if the initial configuration looks weird
> (all fans supposedly stopped and polarity set to "active low"). This
> should protect users of the driver who have a faulty BIOS.

If the driver can perform a similar guess, couldn't it also activate a reverse 
polarity mode as well?  I think all systems boot with with full-speed fan, so 
any value you found at loading time should be the full-speed one, shouln't 
it?

BTW:
  I'm writing a report to giga-byte.

Cheers,
  Simone
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