I've got a Dell Latitude E6410 notebook which changes lcd light intensity in response to ambient light levels, so it has to have some photocell. How can I access the data from this photocell? I tried different google searches like lux meter, light intensity monitor and so on and did not find a single right thing.
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2 Answers
Try:
find /proc /sys | grep -ie brightness -e light -e lux -e lumin
On this laptop (a MacBookPro), it reveals (among other things):
/sys/devices/platform/applesmc.768/light
which is neither over PCI or USB.
You could try the same after
sudo modprobe -a tsl2550 isl29003 isl29020 apds9802als apds990x bh1770glc bh1780gli
which are drivers for various ambient light sensors.
You could also try sensors-detect or i2cdetect and see what they find. Possibly some information is made available from the BIOS (see dmidecode, acpidump, acpiextract, iasl).
answered Oct 12, 2012 at 14:12
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Not much interesting in there. I've edited my answer with more words to search (lux, lumin) and more things to try. Oct 13, 2012 at 13:13
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A few links:
- http://www.kernel.org/doc/menuconfig/drivers-misc-Kconfig.html (to access data from the sensor the kernel must know about the device!)
- http://forum.notebookreview.com/dell-latitude-vostro-precision/475324-e6410-owners-thread-91.html
I do not know what the ALS is in your particular case, but as @January said, you may start from the lspci -Q utility output (which requires an Internet connection to query/requery all IDs - use -q for unknown IDs only).
answered Oct 12, 2012 at 12:29
qdbusviewerto check the device and simultaneously access its stats through D-Bus. This of course assumes you use Linux.