On Fri, Sep 19, 2008 at 07:52:03PM -0700, Paul Goyette wrote: > I've got a couple of motherboards with these devices showing up as "not > configured" in my dmesg output. I'm assuming that they're fan speed > controllers. I'd love to have some control over my fans, so I'd be very > interested in writing a driver for 'fan* at acpi?' > > But, I'm pretty much clueless on how acpi works - it seems to be "black > magic". :) > > Can anyone offer me a starting point on how acpi works? Or even just a > pointer to some specs? I don't think there is a need for a driver. The DSDT holds the definite answer, but I expect your acpitz(4) device(s) to be of the "active" kind, referencing the fan objects of the DSDT. In active cooling mode, the TZ object points to a list of ACPI objects the driver has to invoke a method on when the temperature threshold is reached. I don't think the target device has to expose any other method related to that. -- Quentin Garnier - cube%cubidou.net@localhost - cube%NetBSD.org@localhost "See the look on my face from staying too long in one place [...] every time the morning breaks I know I'm closer to falling" KT Tunstall, Saving My Face, Drastic Fantastic, 2007.
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