pgf at laptop.org
Mon Jun 22 09:38:20 EDT 2009
[ thread moved from techteam list ]
> John Watlington wrote:
> >paul wrote:
> >> when i compared to gen1.5, realized there was no lid connection
> >> at all. it'd be nice for the screen -- the backlight at least --
> >> to reliably shut off when the lid is closed.
> > Hmm. I see your point. We should fix this in software, as both the
> > backlight power and display power are controlled through the DCON.
> > The EC could remove power from the DCON, but that prevents rapid
> > redisplay on lid open... This thread should move to devel.
> On boot OFW inits the DCON from dead cold in fractions of a second.
> The kernel already does this as well. Turn a Gen 1 on and let it sit for
> 20 minutes to let the DPMS screen saver kick on then press a key. The
> turn on is virtually instant. Thats the kernel doing a full DCON init.
right -- my point was not about speed at all. the issue is that
if we're suspended with dcon and/or backlight on, when the lid is
closed, we don't have a reliable way of waking up to turn the
but what thinking about this has really made me realize is that i
don't fully understand how lid wakeups work, even for the
lid-open case that we do support. it seems that EC involvement
is required, even though it's clear from the code in olpc-pm.c
(and the history in #5703) that the geode gpio connections are
key to the process. are there cases where the geode isn't awake
enough to force a wakeup by itself?
(i'm talking exclusively about gen1 here, btw.)
paul fox, pgf at laptop.org
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