User:MartinDengler

+	Software
XO
	13.2.11	2020-01-29
XS
	xs-0.7	2012-02-20

About Me

I program for a living. I got an XO to support the OLPC project and have a laptop for daily use.

I work with python and use Fedora a lot.

See also My SugarLabs page

journal2 playing

m_stone's instructions as to how to get journal2 running:

18:21 < m_stone> mtd: yum install git, git clone git://dev.laptop.org/users/mstone/journal2
18:22 < m_stone> then yum install pinot, then wget http://teach.laptop.org/~mstone/pinot.rpm then rpm -Uvh --force pinot.rpm
18:22 < m_stone> you need to tell pinot to start indexing useful things like your home-dir.
18:23 < m_stone> to do that, just follow the instructions at pinot.berlios.de -- i.e. run 'pinot' and edit its preferences to start indexing.
18:23 < m_stone> mtd: then wait a while for indexing. :)
18:23 < m_stone> mtd: it gets a lot faster once that's done.
18:22 < m_stone> then cd journal2; python gui.py

TODO:

18:19 < m_stone> mtd: you should play with scott's journal2 work. it's easy to get running on 767 and it could use some love.
18:19 < mtd> m_stone: what type of love?
18:20 < m_stone> mtd: well, it's currently a cute little desktop search gui, but it doesn't really know how to talk to launch anything.
18:20 < m_stone> so that would be good first step.
18:20 < m_stone> it could use a nice detail view for its search results
18:24 < m_stone> mtd: I think the other thing that would really help would be drawing in the results background with a 'no results' symbol or text when no results are available
18:25 < m_stone> mtd: and getting it to display results incrementally as they come it.
18:25 < m_stone> mtd: scott took care when designing his dbus api to let you pick out ranges of results on demand.
18:25 < m_stone> but the gui batches up the graphical updates all at once.

frame clock

This should add a digital clock to the frame with the format MM/DD HH:MM. Requires build 767 (current stable and G1G1 2008 build):

1. Launch Terminal and become root by typing 'su -' (without the quotes)

2. Type EXACTLY, ALL ON ONE LINE (mind your spaces and minuses and capitals!)

wget -O - http://www.xades.com/proj/clock_device_767.tar.gz | tar xvzf - -C /usr/share/sugar/shell

...and it may be useful to recall that "copy" in Browse is Ctrl-C, and "paste" in Terminal is Shift-Ctrl-V.

3. Restart Sugar by pressing Ctrl-Alt-Backspace (you will lose all your open programs and data, so be sure to save anything you want first)

Bugs I'm interested in

Cced

my own

rebuilding the kernel with tuxonice support

I'm working on TuxOnIce support, so I'm editing the kernel rebuild instructions.

kernel module building for compcache

To build a kernel module on a joyride XO, ensure you have make and gcc (yum -y install make gcc should do it) and then try:

#get joyride kernel-devel rpm                                                                                                                                     
wget http://dev.laptop.org/~dilinger/{stable,testing}/kernel-devel-`uname -r`.i586.rpm                                                          
sudo rpm -ivh kernel-devel-`uname -r`.i586.rpm                                                                                        
sudo cp -af /boot/* /versions/boot/current/boot/                                                                                                                  
                                                                                                                                                                  
#get compcache                                                                                                                                                    
wget http://compcache.googlecode.com/files/compcache-0.3.tar.gz                                                                                                   
tar xzf compcache-0.3.tar.gz                                                                                                                                      
cd compcache-0.3                                                                                                                                                  
make                                                                                                                                                              
                                                                                                                                                                  
#use it                                                                                                                                                           
sudo ./use_compcache.sh

XO/OLPC mini-projects

I'm interested in helping with:

* Implementing ebook mode (Trac #2954) 
* Sugar grabs too many shortcut keys (Trac #4646) 
* and anything else that looks interesting

Ambient temperature tracking

bash-3.2$ cat /ofw/openprom/model ; echo
CL1   Q2D13  Q2D
bash-3.2$ cat /boot/olpc_build
update.1 691
bash-3.2$ for f in /sys/class/power_supply/olpc-battery/temp* ; do (echo -e $f\\t ; cat $f) | paste - - ; done
/sys/class/power_supply/olpc-battery/temp               2783
/sys/class/power_supply/olpc-battery/temp_ambient               3900

bemasc explained things on #olpc [I edited out background chatter]:

bemasc: "ambient" means "ambient in the case"
bemasc: battery means in the battery compartment
bemasc: the "ambient" thermometer is on the motherboard
bemasc: not sure which chip
bemasc: they were trying to place in the antenna
bemasc: so that it would be far from the heat sources
mtd: bemasc: so I guess if I want to know the temperature outside the case, the lower of the two numbers is closer to that (though still quite inaccurate)
bemasc: the battery temp is closest, yeah
bemasc: if you have another thermometer, you might consider trying to work out the offset and correct for it
bemasc: it'll be different depending on whether the battery is charging or discharging, and how fast
bemasc: and it'll take at least a few minutes to stabilize
bemasc: so it's not easy, but it's also not impossible

Misc snippets to remember

Backlight and blurring switched off, makes some pdfs more readable:

su -c "echo 1 > /sys/devices/platform/dcon/output"

How to explicitly forget/add a WPA wireless network

If you want to forget/add a WPA wireless network explicitly, stop NetworkManager (/etc/init.d/NetworkManader stop) and edit

/home/olpc/.sugar/default/nm/networks.cfg

Screen battery status hint

Date: Sat, 5 Jan 2008 18:09:19 +0000
From: Martin Dengler <martin@martindengler.com>
Subject: Battery capacity in screen hardstatus line hint
To: devel@lists.laptop.org

[-- PGP output follows (current time: Sat 05 Jan 2008 06:23:51 PM GMT) --]
gpg: Signature made Sat 05 Jan 2008 06:09:19 PM GMT using DSA key ID 75C7D2F8
[GNUPG:] SIG_ID AwM6Me4nlHAq/mT0qRJbz79n4sk 2008-01-05 1199556559
[GNUPG:] GOODSIG 81B444DD75C7D2F8 martin@martindengler.com
gpg: Good signature from "martin@martindengler.com"
[GNUPG:] VALIDSIG 565C8F33ABF72DAA33DEB9CB81B444DD75C7D2F8 2008-01-05 1199556559 0 3 0 17 2 01 565C8F33ABF72DAA33DEB9CB81B444DD75C7D2F8
[GNUPG:] TRUST_ULTIMATE
[-- End of PGP output --]

[-- The following data is signed --]

Hi,

In case this is of use to anyone, I've put the battery capacity in my
xo screen instance's hardstatus line with this tiny script & screenrc
change:

---------- /home/olpc/bin/olpc_screen_status.sh
#!/bin/bash
# Author: Martin Dengler <martin@martindengler.com>
# idea from http://www.mail-archive.com/screen-users@gnu.org/msg00322.html
# based on battery info from olpc-logbat
#
B_INFO=/sys/class/power_supply/olpc-battery

while true
do
    CAP=`cat $B_INFO/capacity`
    echo b:$CAP%
    sleep 60
done
----------

....screenrc change:

---------- /home/olpc/bin/.screenrc
# run command forever and assign most recent output to string escape %1`  
backtick 1 0 0 /home/olpc/bin/olpc_screen_status.sh

# the ...%1`... part at the end is the important part
hardstatus alwayslastline "%{.bW}%-w%{.rW}%n %t%{-}%+w %=%{..G} %H %{..Y} %m/%d %C%a %1` "
----------

I'd be interested to know how to get at the ambient temperature sensor mentioned in section 2.4.1 of the CL1 hardware design specification PDF. I've had a look around /sys/class but nothing's jumped out at me.

Other useful OLPC hints

http://www.catmoran.com/olpc

Activity Installation fu

From: Gary C Martin <gary@garycmartin.com>
Subject: Re: Playing w/ Activity packs in build 702

> Can anyone tell me how to install TamTam from scratch?

Not sure if this is the official way â but hidden in the update-
activities.py script from Bert Freudenberg is a very useful link to a
whole bunch of .xo builds, not all of which are available on the wiki
activities page (I'm not sure why). You can find .xo bundles for the
TamTam** activities here:

        http://mock.laptop.org/repos/local.update1/XOS/index.html

** I believe the original TamTam activity is now considered old,
unsupported code, and has been split out into individual activities
called TamTamEdit, TamTamJam, TamTamMini, and TamTamSynthLab.

Once activities are installed, the new xo_get.py script (which
includes Bert's update-activities.py code), is very useful for keeping
all installed activities upgraded to the latest versions available.
You can download the xo-get.py file from:

        http://wiki.laptop.org/go/Xo-get