Hi everyone,
I'm currently conceptualizing an upstream implementation for the fan control on
our Sirius 16 Gen 1 & 2 devices which has the following custom WMI functions
(pseudo code):
void SMOD(bool mode): Toggle firmware controlled fans vs manually (aka via the
commands below) controlled fans
bool GMOD(): Get current SMOD setting
int GCNT(): Get number of fans
enum GTYP(int index): Returns "CPU-fan" or "GPU-fan"
void SSPD(int index, int value): Set fan speed target as a fraction of max speed
int GSPD(int index): Get current fan speed target as a fraction of max speed
int GRPM(int index): Get current actual fan speed in revolutions per minute
int GTMP(int index): Get temperature of thing fan with respective index is
pointed at (CPU or GPU die, see GTYP)
However there are some physical limitations that are not in the firmware and I
would like to implement as low as possible in software, aka the driver, to avoid
hardware damage:
1. Valid fan speeds are 0% (fan off) and 25-100%. Values from 1%-24% must not be
written.
2. As long as GTMP is > 80°C fan speed must be at least 30%.
We would love to see the same driver enforced restrictions in the Uniwil driver
Armin is working on and the Clevo driver Juno Computers is working on.
My Idea so far:
1. Round SSPD input: 0-12% -> 0%, 13-25% -> 25%
2. Periodically check GTMP (every second should be enough) in driver and if the
temperature is over 80°C set current and incoming speed commands to at at least 30%.
Is this legitimate with the hwmon design?
Second question: Is there a good way to implement a userspace controlled switch
between auto and manual mode?
Kind regards,
Werner Sembach
