Ambient light sensor configuration?

Sam Varshavchik mrsam at
Fri Dec 14 00:40:49 UTC 2007

Tomasz Torcz writes:

> Dnia 13-12-2007, czw o godzinie 07:12 -0500, Sam Varshavchik pisze:
>> >  /apps/gnome-panel-manager/ambient
>> The only applet I see is the "Brightness" applet, I don't have any "Ambient" 
>> applet. Is that in a separate package? yum shows nothing obvious.
>  Sorry, I've mistyped that GConf key. It's under gnome-power-manager.

I didn't even realize you were referring to a gconf key -- I was looking for 
an applet.

Anyway, I see this setting now, but disabling it made no difference, even 
after I reboot. Even if I reboot to run level 1, the LCD backlight reacts to 
the ambient light sensor. Further experimentation showed that:

1) No dimming when I'm on the GRUB boot menu. The ambient light sensor has 
no effect.

2) The ambient light sensor begins effecting the LCD backlight as soon as 
the kernel boots, even before initscripts have all the filesystems mounted.

So, there may be some Gnome support for ambient light sensors, but in my 
case I see no other explanation but this is something that's directly 
handled in the kernel. I see nothing that immediately stands out in 'lsmod'.

Grepping through the various kernel modules, the only culprit I can find is 
a "tsl2550.ko' -- a "TSL2550 ambient light sensor driver", but I don't have 
this module loaded at all
Strange mystery.

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