Hi! > We use the sysfs timer trigger of the led subsystem to control our leds (turn on, turn off, and blink). While doing this we found a strange behavior. If the values of delay_on and delay_off are ever both zero, the led subsystem will make the decision to blink at a 500ms on and 500ms off rate. > > # cd /sys/class/leds/g01 > # cat delay_on > 0 > # cat delay_off > 86400 > # echo 0 > delay_off > # cat delay_on > 500 > # cat delay_off > 500 > > drivers/led/led-core.c:184 > /* blink with 1 Hz as default if nothing specified */ > if (!*delay_on && !*delay_off) > *delay_on = *delay_off = 500; > > Is there a reason that the kernel would decide to blink at this default rate instead of leaving the timer disabled? > Yep. It allows hardware to provide different values if it can only blink at fixed rate. Pavel -- http://www.livejournal.com/~pavelmachek
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