Hi! > >>>In my eyes trigger approach is neccessary at least for some hardware, > >>>and things it pretty clear: trigger on == LED changes without > >>>userspace involvement. trigger off == userspace controls the LED. > >> > >>It is likely that it would break many existing users. > > > >Can you elaborate on that? > > There might exist users that adjust LED brightness while having > active trigger. The best example is default-on trigger - it sets > brightness only on init, but remains active all the time. Whereas > this could be fixed, there is another case: think of changing blinking > brightness - it would be impossible. I don't see the breakage. For existing blinking and default-on triggers, existing behaviour would be kept. Difference would be that for hardware that changes triggers itself (like the keyboard light) we would present it as a trigger. And you are right -- there would be user visible changes there. You could not assign blinking, because .. it already has a trigger. But I believe it is reasonable. > >I just tried with leds on thinkpad > > > >root@duo:/sys/class/leds/tpacpi::power# echo 1 > brightness > >root@duo:/sys/class/leds/tpacpi::power# echo 0 > brightness > >root@duo:/sys/class/leds/tpacpi::power# cat trigger > >[none] bluetooth-power kbd-scrollock kbd-numlock kbd-capslock > >kbd-kanalock kbd-shiftlock kbd-altgrlock kbd-ctrllock kbd-altlock > >kbd-shiftllock kbd-shiftrlock kbd-ctrlllock kbd-ctrlrlock AC-online > >BAT0-charging-or-full BAT0-charging BAT0-full > >BAT0-charging-blink-full-solid rfkill0 phy0rx phy0tx phy0assoc > >phy0radio phy0tpt mmc0 timer pattern rfkill1 hci0-power rfkill74 > >heartbeat > >root@duo:/sys/class/leds/tpacpi::power# > > > >I can control the LED from userspace, but then there's no way to put > >the LED back to firmware control. That's just broken. > > > >Do you have a proposal how to handle that? > > Isn't it under firmware control all the time? I'm not 100% sure in the thinkpad case. In the N900 case, we have LED that displays (user_brightness || (user_enabled_indicator && cpu_activity)). I believe clean way to do that would be a trigger. > >>>So I'd do the trigger here. It is same way we can handle LEDs on > >>>thinkpad. Yes, it means you won't be able to do oneshot trigger on > >>>backlight. I don't think that's a huge problem. > >> > >>There have been voices in this discussion claiming the opposite. :-) > > > >Well, lets ignore those voices until the voices understand the current > >design :-). > > Sheer user is not interested in design, but in usability. Well, end user is not expected to touch /sys files directly -- we should create a script for that. /sys should be logical and map well to what we do in kernel. Being "nice to use from shell" is secondary... Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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