Anyone,
In teacher training we had a couple of incidents when practicing copying
to/from flash drives, where an unidentified action caused the journal contents
to vanish. What can be the cause, and is there a way to recover?
David Leeming
Honiara, Solomon Islands
tor.
> As far as I know, they are not available in small quantities.
> The pinout is attached.
it shouldn't be that hard to get a 15 pin D sub HD connector. Fry's or
Jamco have lots of options. is there something special about this
connector?
David Lang
> wad
>
> Begin fo
making any changes to the plastic
2. the card slot on the top would be exposed to the elements, even when
the laptop is closed up. something that they were trying to avoid.
David Lang
The VX855 seems able to handle it but the C7-M might need a heatspreader. In
those conditions how hot/cool are
olpc?
that way it could be run non-root, but still have all the abilities of the
standard tools (including the ability to poll for updates)
the activity rpms can be in a seperate repository so that the people
putting togeather a distro can choose to have them maintained by the root
package manager, or my the user package manager.
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re
> portions of itself that aren't used on the running hardware.
part of the question is going to be what modules need to be installed.
a generic fedora system installs modules for everything, but each module
wastes a partial page of ram, which can add up on a low memory system.
yo
y master list that you
need to update to list what modules you have (unless you want to get
fancy, you can leave the full list with the kernel, but just not put all
of them on the filesystem)
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but having the worst case is
very helpful.
> The A2 boards only booted an image with working wlan at the end of the
> week. We need a bit more time to make sure everything is in place for
> such a measurement to be accurate.
yeah, you can't test the
e 'you will always get this much time, and may get
significantly more' is very repeatable and testable.
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g subtract from the baseline
after these numbers are available, then you can define workloads to try
and simulate 'typical useage patterns', idle system measurements, etc (the
numbers that are so squishy)
re CPU speed: sometimes the cost to sleep/wake is high enough that it is
better to throttle down rather than spinning idle at high speed until the
timeout to go fully to sleep hits
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e that the XO-1 hardware is able
to sleep/wake fast enough to go to sleep between keystrokes, but there
isn't any software build available that actually does anything like this.
I'm not aware of any sofware build that will sleep while the screen is
still powered and displaying t
discussions here was that when the system
went to sleep it powered down the display, because there was no way to set
a timer to wake the system up a little later to then turn off the display.
David Lang
> For 1.5, we plan to turn this on by default, and decrease the
on? from the prior discussion I was under
the impression that there was no timer that kept running once the main
board goes to sleep, so you can't program anything to wake you up later to
turn more stuff off. (not a problem normally, because normal systems don't
have displays that ca
you may be
able to slow down the CPU and still keep up with the incoming data.
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ter.
the multiple system partition approach has a similar problem, but there it
gets a lot more value for the space.
the fact that it takes ~1G for a minimal desktop system is very
disappointing.
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s also quite valuable - it makes it easy to
> preserve user data while replacing/recovering/updating the system software
> using the "blast on a fresh image" method.
only partially true, since sugar wants to install apps in /home, trying to
reset things requires reimaging /home as well.
27;d get to keep
> the advantages of segregation between the two, while also getting
> the ability to more fully utilize the total disk space.
this is what LVM claims to solve. however for the small disk size and the
complexity involved I don't think it would be a good idea.
David Lang
On Tue, 28 Jul 2009, Mitch Bradley wrote:
> da...@lang.hm wrote:
>> On Tue, 28 Jul 2009, Mitch Bradley wrote:
>>
>>> Another important advantage to partitions is that the existence of a boot
>>> partition isolates the firmware from changes in the filesystem used for
>>> the root.
>>
>> can you
p/laptop use for
general-purpose distros, but I don't think that it's flexibility is needed
in this case.
or are you saying that openfirmware _is_ the bootloader on the XO?
if that's the case, consider having a lilo-like mode to avoid having to
teach it how to understand every
much to swamp the RF.
I believe that the slowest modulation available is 1Mb/sec. so you would
have to avoid something in the range of 30+ packets being sent before you
have a chance of hitting break-even
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De
st and rightmost "gradually
> increasing sized dots" keys in the top row, and then pressing the
> M-for-Mitch key?
what you are suggesting is F5 + F8 + 'm' if you have a 'normal' keyboard
attached somehow.
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you are still working the bugs out of the
1.5 laptops, but things like this take a while to get figured out.
thoughts?
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that you have, some are MUCH
faster than others.
David Lang
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$4k, shipping them 2nd day will cost ~$200/shipment
so shipping this 15 times in a month is ~$3k and result in ~2Gb/sec in
bandwidth. you won't get 2Gb/sec in connectivity for this price (assuming
that you can get it to your location in the first place)
David Lang
cheers,
Sameer
Even wi
led IDE is that one component can be
replaced by something else without having to change/loose all the other
things.
David Lang
All your code is perfect because you are a top-quality programmer who do
not
make mistakes because of emacs or what?
You seem to be reading things that I do not writ
to deploy more APs, even though they will interfere
with each other on RF. If there isn't such a limit, then I just need to
worry about making the best use of the RF spectrum that I can.
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u have to transmit on them it takes even more work
(several of your items are receive only, but the critical ones require
transmit capability)
you also ignore licensing and regulatory approval. That actually amounts
to a significant portion of some of the chipsets. you can avoid that by
eli
t; vs
>
>> i repeat. all those can be replaced with _one_ i repeat _one_ single
>> solution, costing roughly... $12, if that.
>>
>
> Was the first $2 a typo or maybe I do not get something?
he claims $10 for the board and other components to drive the $2 chip.
David Lang
ts especially where SDR can
> be re-programmed to do "whatever" in bands where licensing and
> regulatory approval is _not_ required, on a per-country basis?
probably not, for the same reason that OLPC isn't writing it's own OS
anymore. it requires extensive expertise and too
perior A2D-USB2
> converter.
please point me at these magic chips, I would like to use them in my own
projects. I'll bet that these chips can operate in that band, but not
throughout the band without changing external components.
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. the other
> one is definitely 100mhz to 6ghz though.
interesting specs, I wish there was a datasheet and pricing available for
download. I've registered with them so we'll see when they get back to me.
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aps the key question. what's it going to take to
> get an SDR modem into a future XO?
I'm pretty sure that if there is a SDR that's comparibly priced and has
good linux (and unfortunantly, windows) drivers it would be a strong
candidate for a future XO. they ha
09-network/
I've read through these, and they have a lot of useful info. I do have
good RF experiance (and even some halfway decent tools for looking at
things), but I didn't know what, if any limits there were on the number of
clients other than what can be supported by the available airt
> that up with a literature search and could cite the various parts of
> the 802.11 collision-avoidance algorithm which melted down in the 10s
> of clients. I can't cite chapter and verse any more, sadly.
the problem with the 'lots of directional antennas' appro
e enough togeather
that they hear each other, but are in the footprint of different parts of
your infrastructure, you end up with the same type of problems that you
would have if you make the footprint of the infrastructure so large that
you have lots of clients that can't hear each other.
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t me. That is exactly the type
of problem I am trying to learn about.
As these articles say (and I was already planning), I want to have the
access points with power turned down so that I can fit more in a given
area without them overlapping on the same frequency.
David Lang
___
> I am with the Pycon guys that the all the multi-antenna enterprisey
> APs that I've seen don't deliver. Lots of carefully configured
> mid-range APs do better.
that's my impression as well. The enterprisey things may work well for a
hotel or office whe
m (they just want the image to show up
on paper). the one feature that is worth going to some effort to produce
is a way to print double-sided if the printer supports it, but it should
be possible to do this in a way that won't interfere with normal printing.
David Lang
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olpc-update will let me install (some) of the joyride builds, but it
doesn't seem to see the update.1 builds that are being announced on this
list.
so two questions
1. which set of test builds is more useful for me to be running?
2. how do I get it to install the update.1 test builds?
s a slow CPU, but I just recently retired a 333MHz
laptop that I was running Slackware on, and it was far more responsive
then the XO is (even with a faster CPU and a solid-state drive). there is
a LOT of room for improvement here.
David Lang
tly. I haven't had time to dive in much yet (and frankly, the
tangle of processes in Fedora is one reason I've preferred to avoid using
it in the first place), but anything posted as a formal suggestion needs
to be tested.
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nd drag documents to
the server (or to the printer) and have them copied to the server and then
use something on the server to print the document than it would be to
force sneakernet to be used for printing
David Lang
> My guess is schools want a printer if they can afford one. Let us know
&g
are that
it is finding (including several errors related to the trackpad)
I don't know enough totrack these down, but I figured it wouldn't hurt to
call attention to them.
David Lang
X.Org X Server 1.4.0
Release Date: 5 September 2007
X Protocol Version 11, Revision 0
Build Operating
tory)
the missing modules suggest to me that the modules should be added (in
particular dri being missing seems like a performance hit) or the config
file should not try to load them
but the GlideSensor errors sound like more of a problem. is the config
made for a different version of X than wh
top user hits a page on
the school server and uploads the file to be printed, it definantly
doesn't mean 'FTP')
David Lang
> - Sneaker net with USB drives
>
> School systems may have more ideas. Maybe print over the network to a
> central location and snail mail the hard cop
/huge paper for posters at a conference or
> science fair.
>
> Bicycle net might be faster than snail mail. Or maybe it's just a long walk.
but the mesh network should be faster than either.
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On Sat, 5 Jan 2008, David Woodhouse wrote:
On Thu, 2008-01-03 at 22:09 -0800, Dan Krejsa wrote:
Attached are the output from 'iwlist scan' and dmesg. 'quibble' is the
router I'm trying to connect to. It's a netgear WPN824v2.
After collecting these logs, and makin
with olpc-update 653, I can install some of
the joyride systems with olpc-update joyride-1522
what do I need to do to install the update.1 test builds like this one?
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that reflected the nearest MPP anyway (or use
> NAT,
> something we would like to avoid inside the school)
you really don't want to have your IP address change becouse you moved to
have a different MPP closer to you.
David Lang
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at boxes are closest to each one.
then have the mesh route the traffic out to the nearest MPP.
response traffic would go to the MPP that allocated the IP address, and
that box then tunnels the packet over to the MPP box closest to the laptop
(similar to how LVS does load balancing), an
appear to
work.
what should be used for this sort of thing?
David Lang
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ial problems
if you are doing NAT on the MPP then this approach won't work (becouse the
outbound packets don't all go through the same MPP)
if the different MPP boxes are on different Internet connections and there
is egress filtering outside the MPP boxes, that filtering would need to
allow the mesh IP's out through all MPP boxes.
David Lang
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et reset
if the IP of the box changes.
when people normally use a paptop and have it change addresses on them,
it's typically doing so at times when they would expect disruption
(useually at a time when they would close the laptop anyway)
there's a reson that DHCP tri
mesh data. My guess is that it would be
less work for someone who understands the mesh data to try this than it
would be to educate me on the mesh data as you are running against a
deadline (and the fact that I have to fly from LA to Atlanta this weekend
won't help matters any)
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e any nice way to use both of the gamepad controls
in portrit mode. (I do use portrit mode sometimes to make reading tall,
narrow ccolumns easier, but it's hardly my default)
2. this is overriding what the user is explicitly setting, why, and how
can a user change this defau
ersion of OHM is there a way for me to tweak how
they are used?
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et 2 keyboard: Off
I have not yet been able to duplicate this error, but I do notice that
when I switch back to the console the function keys and gamepads don't
produce the samw result (instead of showing ^[[A it just shows A) I
haven't rebooted yet, I will try that next.
David Lan
after a reboot I can duplicate the crash (but only once per reboot)
however the output on the console of the function keys seems to
consistantly be the new version (before and after the crash on new
reboots)
David Lang
On Thu, 10 Jan 2008, [EMAIL PROTECTED] wrote:
> On Thu, 10 Jan 2
these don't seem to work on build 679 (tux paint, xlogo, or this script)
suggestions?
David Lang
On Mon, 7 Jan 2008, Bert Freudenberg wrote:
> On Dec 29, 2007, at 8:48 , Albert Cahalan wrote:
>
>> I wrote a tool to make normal X programs to run under sugar.
>> As a demo,
radio hop for the routing decision? the result should
be that if the node is closer to another MPP node the inbound packet will
go over the wire until it is as close to the laptop as possible.
David Lang
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into an authenticated session)
good luck in re-writing the world.
now, if you are willing to throw way all existing software (and solve the
reconnect security problems) you may be able to make it work, but there
are no apps that work this way today that I am aware of.
David Lang
r means), that will survive IP changes (although even
there they will loose any transactions in flight and require them to be
manually restarted, including laarge transfers)
there are very few (if any) applications that use long-term connections
that will handle IP changes (frankly, most of
file bugs
does this build bring OHM up to date (addressing the issues I ran into in
the 'auto screen rotation' thread?)
David Lang
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on the laptops (in the
OS and all the software), or should we do it in the portal boxes instead?
> As long as the previous mesh portal continues to work for a short
> while, there should be no need for nonstandard mechanisms to "let
> applications know that the IP address is *about* t
lutions for the easy ones
becouse those solutions won't solve everything.
the full solution to every scenrio is MobileIP, but that's a topic of
research papers, nobody knows how to work out all the problems, even in
theory, let alone in the real world.
David Lang
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501, and afterward rebooted
> it. When I did login as root, it asked me password. Can you kindly
> let me know what the password is?
you can do 'sudo passwd' to set the password to a known value
David Lang
> Thanks,
>
> Sung-Hyuck
>
> On Sun, 2008-01-13 at 20:4
range when you can just look up and talk.
I think the thought is to replace the useual situation where the teacher
asks a question and then calls on a single student to answer with one
where the teacher asks a question and then everyone provides an answer,
and the teacher then picks an answer
I can't get the journal to see the SD card with this build.
I can see it from the command line just fine.
David Lang
On Tue, 15 Jan 2008, Build Announcer Script wrote:
> Date: Tue, 15 Jan 2008 15:00:03 -0500 (EST)
> From: Build Announcer Script <[EMAIL PROTECTED]>
> Reply-
similar effects, but what I'm seeing is after a full power cycle. I'm not
doing a suspend
attached is the sugar logfile
David Lang
On Sat, 19 Jan 2008, Tomeu Vizoso wrote:
Date: Sat, 19 Jan 2008 20:02:02 -0500
From: Tomeu Vizoso <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Cc:
to just rebuild the database.
yep, doing a rm -r of .olpc.store fixed the problem
David Lang
> Cheers,
>Olly
>
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>
_
nal with the SD card mounted:
>
> mv /media/2FD2-5097/.olpc.store /media/2FD2-5097/.olpc.store.bk
>
> After rebooting, the SD card should be correctly recognized by the
> Journal.
yes, after removing this dir it's recognised again. thanks.
David Lang
> Tomeu
>
&g
times
just parts of it. after it grinds for a while it crashes (and in the
process corrupts the keyboard under X)
Attached is the sugar logs for the web activity and /var/log/messages
one other strange thing is that when typing at the console the backloght
keeps dimming and brightening.
rom build 682 to joyride 1569 and I found that the web activity
> doesn't start. sometimes I get the toolbar on the top, sometimes just parts
> of it. after it grinds for a while it crashes (and in the process corrupts
> the keyboard under X)
1570 fixed this problem
David Lang
x27;t compose, delete, or quit it stands out :-)
for a while I thought this was related to loading the web activity, but I
just experianced a case of this problem after upgrading to build 687, and
the only thing I've run after the upgrade is a
I am still seeing the blinking backlight problem on build 687 (on a G1G1)
David Lang
On Tue, 22 Jan 2008, Brian Jepson wrote:
> Hi Walter,
>
> I'm on a G1G1 machine. I did pick up the q2d09 firmware upgrade from
> my upgrade to joyride-1568 (I assume that was in later buil
Q2D09 firmware? There have been reports of strange keyboard
> behavior as a result of some EC code changes that first appeared in Q2D09.
I think so (the machine did a firmware upgrade a few upgrades ago, I
haven't seen it switch back)
IIRC the problem first hit when I tried joyride 1
tomorrow night (unless there is a new firmware
build to try :-)
this time a switch from X to the console cleared it up.
David Lang
> [EMAIL PROTECTED] wrote:
>> On Tue, 22 Jan 2008, Mitch Bradley wrote:
>>
>>> [EMAIL PROTECTED] wrote:
>>>> I'm occasi
tem sitting idle with alpine running and the system will
suspend between checks for new mail. if it would wake up again when it was
time to check there wouldn't be a problem
David Lang
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om build: 1590
>>
>> this build appears to break WEP (I upgraded from build 689)
>>
>> the firmware does seem to fix the blinking backling in the console
>>
>> David Lang
>
> WEP seems to be working for me. Are you having an issue connecting to
> a new
On Fri, 25 Jan 2008, Build Announcer v2 wrote:
> http://xs-dev.laptop.org/~cscott/olpc/streams/joyride/build1591
>
> Changes in build 1591 from build: 1590
this build appears to break WEP (I upgraded from build 689)
the firmware does seem to fix the blinking backling in the console
D
nnouncer v2 wrote:
>>>>
>>>>> http://xs-dev.laptop.org/~cscott/olpc/streams/joyride/build1591
>>>>>
>>>>> Changes in build 1591 from build: 1590
>>>>
>>>> this build appears to break WEP (I upgraded from build 689)
>>>
are is that
page up/down move you one visable page (i.e. one screen worth) at a time,
not the mount that would fit on one piece of paper at a time (some
software will overlap the pages by moving a line or two less than a page)
try this with any existingpdf reader or any word processing s
ed to switch back the mouse was very flaky (a problem I have
not had in the past) and the machine finally froze, after 15 min I power
cycled it.
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hips with
the qwerty layout in the US becouse that is the standard.
an improvement needs to be enough better to justify violating existing
standard practice.
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desired. personally I wouldn't want to machine to go to a deeper sleep
unless I hit the power button, I don't even want closing the lid to do
more then turn off the backlight, I want software to keep running)
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ngers is difficult.
> Qwerty tries to minimize exactly this case. Dvorak, which attempts to place
> digraphs next to each other, might be slower on this size keyboard.
but adults are not supposed to be useing these keyboards ;-)
David Lang
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changed?
I upgraded to the joyride version with this firmware, couldn't reach my
network, so rebooted to 689, repeated the process with 690, same
WEP problem so rebooted to 689 where I had the problem reported above.
as I understand it this should have left me with everything the same
except the firmware.
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e:
>>
>> ec-abnormal@ .
>
> interesting, the battery life hasn't been great, but it's been working.
> I'll rebootand report the result.
>
>> Note the ' .' on the end. That prints out the value. This should print a
>> number. Please report
result.
>>
>>> Note the ' .' on the end. That prints out the value. This should print a
>>> number. Please report back what that error code is.
>
> it reports 9
removing and reseating the battery cleared the problem (at least for now).
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y? Should the game buttons stay
> static even when rotating?
I believe that there needs to be a better way for an application to define
how these keys work for it (ideally including the rotate key)
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events (which should be standard for apps that live in a GUI environment
anyway, even if they are text apps that run in an xterm)
while I understand the desire to avoid modal operation and also to not
have the e-book mode operate by moving a pointer around, I think that
:7.1.211-1.fc7
this fixed WEP for me (compared to 1590 and 690)
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working, and when
I did reconnect alpine didn't recover it's IMAP connection (I had to tell
it to break the connection and re-establish it)
in getting connected to my LAN again I tried, was asked to input the WEP
data, it failed, I tried again, it failed, I tried another
ome software manuals (~200 pages each) and tried to read them
as well (the manuals suffered from fonts being invisable, but this seems
to be mostly, if not completely fixed in recent builds)
David Langdiff --git a/shell/ev-view.c b/shell/ev-view.c
index b464c3f..3bfe7da 100644
--- a/shell
you could use something
like a long press as opposed to a short press, but that violates the
principle of least surprise.
all you would have to do to get the rotation functionality back is to lift
the screen an inch or two and hit the rotation button.
David Langdiff --git a/shell/ev-view.c b/she
o
> where I wanted to click.
this is already possible. check the tips section on the olpc forums, I
don't remember the exact file to edit, but it was pretty trivial.
David Lang
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itting the button)
http://en.forum.laptop.org/viewtopic.php?f=17&t=930
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will quickly
learn to start a page load and switch to something else while waiting for
it. suspending the browser when it's in the background will cause all
sorts of grief.
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27;ve been useing my XO daily for the last month, and I think the idea is
great, but I've been getting frustrated by some of the software, and hit
one too many network disconnects becouse of the agressive power savings,
which promted meto finally vent these frustrtions
David Lang
gnificant (enough to cut the throughput by a factor of
10 compared to a staticly linked version)
if you can get the linking and initialization step down to once per boot
it will bee a huge win.
David Lang
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there is not a large installed base of Sugar users, so I think
that having Sugar available as an option for people to run who are already
running Android (substatute any 'poor fit' linux system here) will be a
win as it gives people who are already running that system the ability to
try S
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