Switch to indicate ebook mode
jordan.crouse at amd.com
Mon Dec 18 12:23:17 EST 2006
On 18/12/06 17:53 +0100, Bert Freudenberg wrote:
> On Dec 18, 2006, at 17:35 , Jordan Crouse wrote:
> >On 17/12/06 20:50 +0000, Chris Ball wrote:
> >>>>On Sun, 17 Dec 2006 13:05:52, Dan Williams <dcbw at redhat.com> said:
> >>>I can't remember if I ever got a straight answer on this. Is there
> >>>a switch somewhere that we can access that indicates whether or not
> >>>the laptop has been swiveled into ebook mode?
> >>This is <http://dev.laptop.org/ticket/467>.
> >>>Ideally, the switch would generate an interrupt which we could
> >>>receive and automatically rotate the X display and switch to B&W
> >>>mode when the keyboard is hidden . It's not a great experience
> >>>to have to expose a toggle somewhere if we can't figure out when
> >>>we're in ebook mode, especially if we had to rely on activities to
> >>>provide that toggle in their own UI.
> >>Yeah, it looks like we have the bit, but we don't want to poll it and
> >>Quanta are blocking on us working out an interface for interrupts,
> >>as in
> >><http://dev.laptop.org/ticket/224>. Could we get someone to own
> >This reminds me - I've been meaning to ask how the switches
> >actually work.
> >There are two of them - one with the output marked PWR_BUT_in and
> >the other
> >with the output marked EB_MODE. I understand from the product
> >that these are Hall Effect sensors, which in effect detect the
> >of a magnetic field nearby. Sensor one (PWR_BUT_in) is located on the
> >LCD side of the board at the top right near the notch. Sensor two
> >(EB_MODE) is located on the processor side in the same location. From
> >the position of sensor 1, I am assuming that it detects a lid
> >opening, and
> >the magnetic field is located in the base. I can't at all figure
> >out where
> >the magnet is for sensor 2, nor how it detects EB mode.
> >So - long story short, where the heck are the magnets? :)
> When you turn the display around, wouldn't the second sensor then
> come to rest near the same magnet? So you only need one magnet for both?
Doh - I'll bet thats it. So the sensor doesn't really indicate orientation,
but rather that the screen is turned around. :( Still useful, but not
for what we wanted.
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