[olpc-help] Screen blacks out midway during boot

[Richard A. Smith]

paz wrote:

> I am wondering if a process similar to the low power shutdown can be
> triggered when the system is up and running and the power button is
> pressed for 5-10 seconds or some such obviously deliberate length of
> time.
> 
> First thing this evening, I will launch the XO and post guard to
> determine if the low power shutdown is indeed graceful.

I'll save you the trouble.  No. its not graceful.  In the currently 
released builds at 15% the red low battery light comes on.  Its up to 
the user to shutdown at that point or plugin to external power.

At around 7-9% the battery voltage begins to flirt with the lower limits 
of what can maintain a working system.  If you cross that thershold then 
the EC turns off the power rails.  No warning just instant off.

If you hold the power button down for about 4 seconds the EC will also 
drop the power rails.

Better power handling will show up in Update.1 but graceful shutdown on 
low battery is probably an Update.2 item.

-- 
Richard Smith  <richard at laptop.org>
One Laptop Per Child