http://bugzilla.kernel.org/show_bug.cgi?id=8495
[EMAIL PROTECTED] changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |REJECTED
Resolution| |INVALID
------- Additional Comments From [EMAIL PROTECTED] 2007-05-20 14:27 -------
Thanks for testing.
The results confirm that the ACPI BIOS
will change the trip-points to implement
hysteresis when it crosses the ACPI trip points.
Yes, this will wipe out any modifications that the user
has made to the OS copy of the trip points.
Further, as the user no longer sees the ACPI trip-points,
the user may not know when this is going to happen,
and would thus have to continuously over-ride the OS trip points
on every temperature change or trip-point event
to make the over-ride effective.
Finally, if the user does not enabling polling, the
modified OS trip points have no effect at all except
to deceive the user into thinking that they've implemented
a change in policy - since the BIOS continues to work with
the real ACPI trip points.
For these reasons, the ability for the user to over-ride
the OS copy of the read-only ACPI trip-points was a bug,
and removing that ability was a bug-fix.
You have confirmed that you can over-ride the state of
the fan until the next ACPI trip point is reached --
and that is what you should do if you disagree with
the policy implemented by the system vendor.
If too loud, turn off/down the fan.
If too warm, turn on/up the fan.
Also, if the vendor (had) implemented _SCP (cooling_mode)
that would give you a choice in cooling policies.
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