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Full Version: Make Backlight Go Off On Screen Close?
OESF Portables Forum > Model Specific Forums > Sharp Zaurus > Zaurus - pdaXrom
Is it possible to make the backlight go off when the screen is closed under r198? I think there was a thread about this somewhere, but I couldn't remember where.

I believe mine does... I will have to verify

Mine definately does not. How is turning off the backlight handled?
I'm not running r198, but in beta 3 the backlight only turned off upon closing the lid in Matchbox (I've tried to get it working in XFCE but, although it worked, I encountered too many screen rotation problems). I've seen you post about other WMs, so my advice would be to try it in Matchbox since InSearchOf said he thought his backlight turns on (unless you are using Matchbox).
the rotation script handles what happens at each screen state, ie landscape, portrait, closed
I've seen swichevd go into a non working state on my c860 ... and neaded to restart it rarely. Hen swichevd is working properly on my c860 the backlight is turned off ok when I close the lid, this is not the case on my Z when the daemon is in the non working state.
In order to minimize problems when switchevd is not working properly I generally have the backlight turn off after one minute anyway (trough or my command line shell script alternative).

In case your Z is doing something different to what mine is dooing, to my understanding, this is the way switchevd works:
the daemon monitors any changes in the event0 device file,
the daemon reacts ot any changes in the event0 device file by running script with the appropriate parameters (in a way similar to the way acpi works on a standard xo6 .... this is much better then the way apm in mabaged in beta4 and above).

You could modify the to also accomplish other actions on lid close/open states.

Personally I hate the python script (it takes so long to load only to do very simple tasks and also it's pretty pointless when you are in natural sunlight because you cannot see the LightnPower window anyway) ... I've made an alternative command line shell script to do more or less the same things (if anyone is ontrested I'll share it).
Anyway in order to switch backlight on ad off you can do this:
echo "0" > /sys/class/backlight/corgi-bl/brightness #this turns it off
echo "3" > /sys/class/backlight/corgi-bl/brightness #turns it to brightness 3

If you do such actions manually the backlight will not come back on when you press any key ... so be carefull.

Managing the backlight i such a way may not be desirable ... one might prefer using the dpms features of xset:
xset dpms force standby
might be a better way to turn off the backlight ... this way you get back to the normal behaviour when you hit ant kay.
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