Ambient Light Sensor?

Ambient Light Sensor?

[Len Brown]

Has anybody seen ACPI-based ambient light sensor support on a commercial system?

You'd recognize it by a device with PNPid ACPI0008 exported via the AML device tree.

I've seen it on an Intel Capell Valley CRB, but I was wondering
if anybody is using it in the "real world" yet.

I've seen just the dmesg from a MacBook Pro on the web
suggesting that system exports ACPI0008:
http://www.uwsg.iu.edu/hypermail/linux/kernel/0703.0/1475.html

thanks,
-Len

Re: Ambient Light Sensor?

[Dave Jones]

On Mon, Mar 19, 2007 at 01:41:41PM -0400, Len Brown wrote:
 > Has anybody seen ACPI-based ambient light sensor support on a commercial system?
 > 
 > You'd recognize it by a device with PNPid ACPI0008 exported via the AML device tree.
 > 
 > I've seen it on an Intel Capell Valley CRB, but I was wondering
 > if anybody is using it in the "real world" yet.
 > 
 > I've seen just the dmesg from a MacBook Pro on the web
 > suggesting that system exports ACPI0008:
 > http://www.uwsg.iu.edu/hypermail/linux/kernel/0703.0/1475.html

Right. Under OSX, it uses it to adjust the keyboard backlight.
(It may also do something fancy wrt gamma correction with the
 built-in webcam)

	Dave

-- 
http://www.codemonkey.org.uk

Re: Ambient Light Sensor?

[Franklin Marmon]

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Ambient light sensors are on the Dell Latitude D820, a buddy of mine purchased 
one not to long ago.

frm

On Tuesday March 20 2007 09:13, Dave Jones wrote:
> On Mon, Mar 19, 2007 at 01:41:41PM -0400, Len Brown wrote:
>  > Has anybody seen ACPI-based ambient light sensor support on a commercial
>  > system?
>  >
>  > You'd recognize it by a device with PNPid ACPI0008 exported via the AML
>  > device tree.
>  >
>  > I've seen it on an Intel Capell Valley CRB, but I was wondering
>  > if anybody is using it in the "real world" yet.
>  >
>  > I've seen just the dmesg from a MacBook Pro on the web
>  > suggesting that system exports ACPI0008:
>  > http://www.uwsg.iu.edu/hypermail/linux/kernel/0703.0/1475.html
>
> Right. Under OSX, it uses it to adjust the keyboard backlight.
> (It may also do something fancy wrt gamma correction with the
>  built-in webcam)
>
> 	Dave

-- 
Franklin Marmon
The Hyde Company
331 East Broadway
Missoula, MT 59801
http://www.hydeco.com
406-541-4777
JabberID: marmon@jabber.montana.com

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Re: Ambient Light Sensor?

[Matthew Garrett]

On Mon, Mar 19, 2007 at 01:41:41PM -0400, Len Brown wrote:

> I've seen just the dmesg from a MacBook Pro on the web
> suggesting that system exports ACPI0008:
> http://www.uwsg.iu.edu/hypermail/linux/kernel/0703.0/1475.html

Yes, it's present in the Macbook Pro. The HP nc6220 has a sensor, but 
doesn't expose it via ACPI - there's some BIOS calls to get at it.

-- 
Matthew Garrett | mjg59@srcf.ucam.org