Re: adjusting broken ACPI thermal trip points

[Olaf Hering <olaf@aepfle.de>]

On Thu, Oct 01, Olaf Hering wrote:

> Initially I reported https://bugzilla.kernel.org/show_bug.cgi?id=67101

And related to this:

why would the first command enable the fan after boot only sometimes,
while the second one will succeed every time? Is this a kernel or
firmware bug?

# while :;do for i in 2 4 ; do echo 1 > /sys/class/thermal/cooling_device$i/cur_state ; cat /sys/class/thermal/cooling_device$i/cur_state > /dev/null ; done ; sleep 2 ; done

# while :;do for i in 2 4 ; do echo 1 > /sys/class/thermal/cooling_device$i/cur_state ; done ; sleep 2 ; done


Appearently cur_state must be read right after writing to it to have an
effect when selecting fan speeds for 0, 1 or 2.

Olaf