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SubjectRe: [ibm-acpi-devel] Fan level 7 after resume wit 2.6.28-rc3
Date
On Thursday, 6 of November 2008, Henrique de Moraes Holschuh wrote:
> On Thu, 06 Nov 2008, Tino Keitel wrote:
> > The whole fan level stuff looks a bit complicated to me. Especially the
>
> It is. The sysfs hwmon interface does not map 1:1 with the three possible
> thinkpad fan control interfaces. fan_control_desired_level is used for that
> interface mainly, since I have to remember the last state used that was in
> the set of 0-7, ignoring AUTO (which is a separate pwm control mode for
> hwmon) and full-speed (which is a separate pwm control mode for hwmon).
>
> It is hijacked by fan_suspend/fan_resume to store state between
> sleep/resume, because that was convenient. Too bad I failed to notice it
> would not work properly for that.
>
> > The attached patch tries to simplify this a bit. It sets
>
> NAK, it would break a lot of stuff. See my previous reply on this thread
> for *some* of the stuff it would break.
>
> I will have a proper patch out probably within 24h but most certainly before
> next Monday.
>
> Meanwhile, I suggest you just remove the calls to fan_suspend and fan_resume
> as a workaround.

Speaking of which, last time I looked at fan_suspend and fan_resume, they
were hopelessly broken (I admit that was quite some time ago, though).

IMO, fan_suspend() is not necessary at all and the only thing fan_resume()
could do is to make the kernel's data structures reflect the actual state of
the fan.

Thanks,
Rafael


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