Thread: big news regarding Fremantle MCE
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joerg_rw is offline joerg_rw
2014-01-25 , 09:04
Posts: 2,222 | Thanked: 12,651 times | Joined on Mar 2010 @ SOL 3
#39
we already have control over the 6 kbd LEDs.
See
sudo gainroot;
sleep 5; stop mce; echo "disabled" >/sys/class/i2c-adapter/i2c-2/2-0032/engine3_mode; j=10; while [ ${j} -gt 0 ]; do j=$(( j-1 )); for i in $(seq 1 6); do echo "100" >/sys/class/leds/lp5523:kb${i}/brightness; sleep 2; echo "0" >/sys/class/leds/lp5523:kb${i}/brightness; done; done; start mce
(except of sudo gainroot, it's ONE line! Slide open kbd and then lock the screen immediately - during the initial "sleep 5" - after firing the line in xterm)

To understand what's this stuff about engines, try this instead:
sudo gainroot;
sleep 5; stop mce; j=10; while [ ${j} -gt 0 ]; do j=$(( j-1 )); for i in $(seq 1 6); do echo "100" >/sys/class/leds/lp5523:kb${i}/brightness; sleep 2; echo "0" >/sys/class/leds/lp5523:kb${i}/brightness; done; done; start mce
It's just missing the disabling of engine3 which we can't control as long as mce is running, so the kbd-dimming program you correctly spotted in mce is running all the time and dimming the LED in a fraction of one second after this shellscript turned it on. Even worse: mce is loading this program and starting it all the time (actually with every event like keypress etc)
That's what I called "abuse of a smart engine for stupid dimming" and suggested to rather let mce do it once in software than program engine3 to do it. Thus we could use all 3 engines for true rainbow color effects in indicator LED.

/j
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