Per-monitor options for speeding up ddcutil runtime #580
Description
Current state:
ddcutil API calls in https://github.com/fastfetch-cli/fastfetch/blob/dev/src/detection/brightness/brightness_linux.c take a really long time stalling fastfetch -l none -s brightness --stat for ~850ms in my case with 2 monitors:
Brightness (HP 24x): 60%
Brightness (VG2401 Series): 60% 858ms
Wanted state:
I noticed ddcutil -d 1 getvcp 10 for example takes ~760ms, but as per https://www.ddcutil.com/faq/#ddcutil-is-slow I could get it down to a very respectable ~50ms for both of my monitors with e.g. ddcutil --bus 7 --sleep-multiplier 0.01 getvcp 10!
$ ddcutil detect
Display 1
I2C bus: /dev/i2c-7
EDID synopsis:
Model: HP 24x
...
Display 2
I2C bus: /dev/i2c-8
EDID synopsis:
Model: VG2401 Series
...
$ time ddcutil -d 1 getvcp 10
VCP code 0x10 (Brightness ): current value = 75, max value = 100
real 0m0.757s
user 0m0.005s
sys 0m0.240s
$ time ddcutil --bus 7 --sleep-multiplier 0.01 getvcp 10
VCP code 0x10 (Brightness ): current value = 75, max value = 100
real 0m0.048s
user 0m0.003s
sys 0m0.035s
Comparison with some other args:
$ time ddcutil -d 1 --sleep-multiplier 0.01 getvcp 10
VCP code 0x10 (Brightness ): current value = 75, max value = 100
real 0m0.256s
user 0m0.004s
sys 0m0.241s
$ time ddcutil --bus 7 getvcp 10
VCP code 0x10 (Brightness ): current value = 75, max value = 100
real 0m0.351s
user 0m0.003s
sys 0m0.037s
Basically I would like an option similar to --brightness-ddcutil-monitors='HP 24x:7:0.01:VG2401 Series:8:0.01' where my example format is monitor:i2c_bus:sleep_multiplier allowing for similar ddcutil call I described above to be done from fastfetch when it calls the API.
Why the change is sensible:
It could make fastfetch even faster when showing display brightnesses via DDC/CI with a bit of configuration :)