Re: Help needed to add support for the ThinkVantage (key) LED

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On Wed, 05 Nov 2008, Chris Jones wrote:
> Henrique de Moraes Holschuh wrote:
> > When the BIOS turns the thinkvantage LED on, is it brighter than when you
> > did echo 0x0c 0x8d >/proc/acpi/ibm/ecdump ?
> 
> Unscientifically, yes I think so. It's more like the brightness when I
> put it in the blinking mode. When I just set it to "on" I almost had to
> cup my hand over the button to see the light at all. Switching it to
> "blink" was noticably brighter.

Ok, that means standard LED control is pretty much useless for that LED
except for off and blinking.  I will have to wait for someone to test the
extra bits, then, because I can't provide a LED interface where ON is not
working well.

BTW, given the above clues that the LED has brightness control, testing
these extra bits on the thinkvantage LED is probably safe.  I *cannot* be
really sure it IS safe, but the hints are there that these bits are required
to use the thinkvantage LED, and the ACPI method to control it certainly
makes that clear.  It just doesn't tell me what the bits do.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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