On Tue, Sep 28 2021 at 13:56:05 +0200, Hans de Goede
<hdegoede@xxxxxxxxxx> wrote:
Hi,
On 9/28/21 1:43 PM, Luke Jones wrote:
Sure, the path is similar to
/sys/devices/platform/asus-nb-wmi/hwmon/hwmon4/pwm1_enable where
hwmon4 will likely be different depending on init, and pwm2_enable
is the second fan if it exists. The values are 1,2,3 - where 1 = fan
curve enabled/manual, 2 = auto. 3 here is custom extra that writes
default curve back then defaults to 2.
As I understand it, this should be adhering to the accepted kernel
standard, so if you use this for ASUS laptops, then it should carry
over to other brands that implement it also.
Ah, so this is a bit different then how I thought this would work
(this is probably better though).
<snip>
The fans have settings [1,2,3] under pwm<N>_enable:
1. Enable and write settings out
2. Disable and use factory fan mode
3. Same as 2, additionally restoring default factory curve.
Quoting Documentation/hwmon/sysfs-interface.rst
`pwm[1-*]_enable`
Fan speed control method:
- 0: no fan speed control (i.e. fan at full speed)
- 1: manual fan speed control enabled (using
`pwm[1-*]`)
- 2+: automatic fan speed control enabled
1 normally means the fans runs at a fixed speed, but you are using it
for the custom/manual profile, which is still a temp<->pwm table,
right?
I guess this make sense since full manual control is not supported
and this keeps "2" aka auto as being the normal factory auto
setting which is good.
Bastien is this interface usable for p-p-d ?
I guess that it is a bit annoying that you need to figure out
the # in the hwmon# part of the path, but there will be only
one hwmon child.
You could also go through /sys/class/hwmon but then you really
have no idea which one to use. Ideally we would have some way
to indicate that there is a hmwon class-dev associated with
/sys/firmware/acpi/platform_profile but as we mentioned before
we should defer coming up with a generic solution for this
until we have more then 1 user, so that we hopefully get the
generic solution right in one go.
If it's at all helpful, I named the interface as
"asus_custom_fan_curve". I use this to verify I have the correct hwmon
for asusctl. Open to suggestions on that.
Regards,
Hans
Use of 2 means that the curve the user has set is still stored
and
won't be erased, but the laptop will be using its default
auto-fan
mode. Re-enabling the manual mode then activates the curves
again.
Notes:
- pwm<N>_enable = 0 is an invalid setting.
- pwm is actually a percentage and is scaled on writing to
device.
I was trying to update:
https://gitlab.freedesktop.org/hadess/power-profiles-daemon/-/merge_requests/80
but I don't understand what files I need to check for what values
to
detect whether custom fan curves were used.
Can you help me out here?
Also, was this patch accepted in the pdx86 tree?
Cheers
