On Wed, May 12, 2010 at 10:31:50AM -0400, Martin Langhoff wrote:
On Wed, May 12, 2010 at 1:46 AM, James Cameron qu...@laptop.org wrote:
With the 250Mb test I've been doing, this causes 8 seconds in dd, 147
seconds in sync, and a nice distribution of write latencies (largest
samples 0.2s
Created by the local techs of our deployment in Caacupé:
http://oficina.paraguayeduca.org/~rgs/multiple-chargers/
Raúl
___
Devel mailing list
Devel@lists.laptop.org
http://lists.laptop.org/listinfo/devel
On Wed, May 12, 2010 at 05:31:57PM -0400, Raul Gutierrez Segales wrote:
Created by the local techs of our deployment in Caacup??:
http://oficina.paraguayeduca.org/~rgs/multiple-chargers/
Neat.
An ATX or AT switch-mode power supply attached to a set of nine laptop
charging cables. The power
On Thu, May 13, 2010 at 06:44:34PM +1000, James Cameron wrote:
An ATX or AT switch-mode power supply attached to a set of nine laptop
charging cables. The power supply is being used as a 12V DC regulated
source. The original PC power harness cables have been removed.
FWIW, I've also used a
On 05/13/2010 03:26 AM, James Cameron wrote:
We discussed this briefly in team meeting this morning ... Record is
writing an uncompressed stream to SD, before then compressing it in the
Save step once the video recording is stopped. (I could be wrong).
This means that no matter what the
That is probably a wrong analysis of the problem.
Many higher power supplies like AT/ATX power supplies don't
work properly when unloaded. I bet if you draw a couple of
amps from the +5V supply, you would find that the +12V supply
starts working fine.
I used to use car headlights to provide
We did this in Uruguay. It's difficult to ensure proper regulation on the
12V rail. You have to have a proper load to ensure stability. A good power
supply of course helps. To improve this you can put a resistor in the 5V
rail. Of course it wastes some power and the heat is a concern if it's
Exactly, some load in the 5V rail is needed.
We managed to charge up to 20 XO using a single 680W power supply.
In any case, the total power of the supply is not important, you must check
the 12V rail current rating (and estimate approx 1.5A per XO).
Also, some power supplies have more than 1 12V
On Thu, May 13, 2010 at 09:24:17AM -0400, John Watlington wrote:
FWIW, I've also used a ATX power supply to power an XO-1, but stopped
doing so once I discovered why the XO-1.5 would run from it: Being a
cheap model, it regulated only the 5V rail, so the 12V rail dropped
down to 9V with a
On May 13, 2010, at 10:18 AM, Sascha Silbe wrote:
On Thu, May 13, 2010 at 09:24:17AM -0400, John Watlington wrote:
FWIW, I've also used a ATX power supply to power an XO-1, but stopped doing
so once I discovered why the XO-1.5 would run from it: Being a cheap model,
it regulated only the
Sascha, that's correct, once the 5V rail is loaded the 12V rail is properly
(properly depending on the power supply quality) regulated. Apparently,
switched power supplies need a proper load to correctly regulate voltage.
You may try something like 1A in the 5V rail. Be sure to use a resistor
It's called Sugru (http://sugru.com) and it's quite intriguing. Basically,
it's a putty-like stuff that cures into a soft silicone rubber. It also
sticks to most things while it's not cured (but after curing is not sticky.)
Ideas for using this related to OLPC:
Put some on the bottom of an XO.
I've placed a couple XO-1s (one CSN748, one SHC842 - both build 802B1)
with an ordinary family for use by their 5 and 6 year olds (in Texas).
Those daughters had lots of trouble using the touchpad -- jumpy cursor;
hard to control the cursor position; recalibration of touchpad
(automatic or manual)
On 10 May 2010 14:37, Martin Langhoff martin.langh...@gmail.com wrote:
at least let's get greplease merged now. It is non-controversial, and
fixes a long standing bug that hits large deployments...
done,sorry for delay
___
Devel mailing list
http://wiki.laptop.org/go/OLPC_Firmware_q2e43 is a candidate for a
general-availability firmware release for XO-1. It fixes problems found
during testing of q2e42, which was not intended for general availability
(because we suspected it would have problems due to the long interval
from q2e41
http://wiki.laptop.org/go/F11_for_1.5
http://build.laptop.org/10.2.0/os124
Compressed image size: 677.10mb (-0.55mb since build 123)
Description of changes in this build:
* Upgrade to q3a39.
* kernel: EC wakeup timer access
* olpc-utils, #10152, #10158: Fix sound in totem, use totem to play
On Wed, 2010-04-21 at 18:27 +0200, Martin Langhoff wrote:
On Fri, Mar 12, 2010 at 2:59 PM, Raul Gutierrez Segales
r...@rieder.net.py wrote:
We are testing extensively XS 0.6 looking forward to upgrade our current
(10) servers in production and to use it in our (26) new servers as
well.
17 matches
Mail list logo
