Latest revision as of 18:04, 6 October 2012

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

OLPC Trial-2 Software Release Notes

This page has information about the build 542 software image from 2007. It appears this was provided for some XO Beta 2 hardware units. Important changes are noted below. This image is "late alpha-test" software; there is much you can now do with the laptop out of the box (See 542 Demo Notes). General – somewhat outdated – instructions on how to use the Sugar interface can be found here. Also of note are the BTest-1 Release Notes, BTest-2 Release Notes and BTest-4 Release Notes. These latter pages detail issues with particular versions of the hardware. The Library Release Notes page has information about the early stages of our sample content library. Finally, the OLPC Human Interface Guidelines describe our vision of where we are heading, only partially reflected in our current software.

The software is just maturing to the point where we can embark upon later-stage trials for feedback and polish. Please review the #Notes below and please report any new bugs to our trac system (See http://dev.laptop.org).

Overview

Most of the first-generation vision for our system is now present and working:

The Journal
Presence service
Easy real-time collaboration in many of our activities including:
- Read, Write, Chat, Record, Etoys, TamTam Jam, Memorize, Connect4
Mesh networking
- Automatic configuration of Mesh Portal Points (MPP)
- Automatic configuration of ad-hoc meshes, allowing collaboration without any infrastructure or Internet access
Anti-theft activation on installation
Registration with a school server
Backup to the school server

The software has been rebased onto Fedora Core 7 and Python 2.5.

Remaining tasks:

Finish building out collaboration in our other activities
Anti-theft leases
Execution of activities in containers
In-place robust updates
Download and installation of activities

Important Notes

At this time, we do not recommend installing the Trial-2 software on B2-1 systems (128 meg of RAM), due to excessive RAM usage. We are working on fixing the increased memory consumption.

Stable Builds

The release notes on this page apply to an outdated software release.

USB Update key needed to upgrade systems in the field#1748: Note that the Autoreinstallation image has latent support for preserving the user files on the system in the olpc.fth file; it has not yet been extensively tested. To boot with backup edit the olpc.fth file to change 'false' to 'true' in line 11. The USB key must be large enough to hold both the image to be installed and any and all files the user may have created in /home/OLPC.

Base System Notes

The system is now based on Fedora Core 7, and OLPC's kernel is based on Linux 2.6.22.

Suspend/Resume and Power Management

Suspend/Resume#60: Note that a number of the bugs in the tracker bug are likely duplicates. Suspend and resume using the power button should function on B2, B3 and B4 systems. Only B3 and B4 systems can resume on a keystroke, touchpad touch, or button press. The most interesting of these bugs are the following:

USB wireless suspend/resume failure at setup phase#1752: The Marvell firmware does not always wakeup properly. You may need to power the laptop all the way down by holding the suspend button for >5 seconds. Then power up.

Coming out of DPMS on resume seems to be failing in OHM#2631: if the screen has been turned off due to the display power management system, the screen may not be turned back on on resume. You may need to power the laptop all the way down by holding the suspend button for >5 seconds. Then power up.

Wakeup event is repeated continuously#2401: This bug in the embedded controller code, now understood and soon repaired, causes repeated button/gamepad events on wakeup, getting in the way of ebook reading with aggressive power savings by causing constant scrolling. This support is already present in the book reader (touch /home/olpc/ebook-enable-sleep and restart the reader to turn this on).

Laptop wakes up and doesn't sleep again when it should#2660: The laptop suspends when you close the lid (currently leaving wireless on, which may or may not be wrong); but if you insert or remove power to the laptop, it wakes up again despite being closed.

Display driver needs to enable/disable the dcon power control line#2237: This is consuming significant power in suspend even when the screen is off.

Other

Horrible noise in TamTam upon resume#2319: Start TamTam. Close lid. Wait 3 seconds. Reopen the lid: Bad noise. Close lid. Noise stops Wait 3 seconds. Reopen the lid: BAD noise. Close lid. Noise stops. etc etc... Nothing short of shutting the system down will cure this noise. Needless to say, we'll fix this as soon as possible. This can also occur with games that may have audio playing; it is not TamTam's fault.

Field Return: flash corruption - Open Firmware complaining of 'unknown node type#1905: If you see this, please add your serial number information to this trac ticket.

Activity sharing: will only work correctly when all XOs that wish to participate are using the same connection method. I.e., all must be either only link-local, or only server-connected.

Customizing NAND images: It is easy to customize a build for your own environment, as outlined here.

Python Performance: Python 2.5 has much better heap performance. The Geode LX processor in BTest-3/4 has again greatly increased performance due to its larger cache..

Booting time continues to improve#623: We understand where much of the rest of the boot time is currently going, as you can see by checking the bugs referred to in 623. Boot time, however, is not our highest priority; suspend/resume is clearly more important.

Battery problems#217: (including failure to charge#217, overcharge#667, incorrect capacity reporting#596, battery draining quickly when turned off#553) All known battery charging problems have been resolved. Note that for long term storage, removing the battery pack after a full charge is best practice; this is true for all battery powered devices. A raft of problems with batteries has been fixed by EC firmware patches up through Q2B83. Most, but not all, dead batteries can be recovered in the field with existing BTest-2 systems (See Battery Charging for more details). LiFe batteries incorrectly flash red light#1051 was fixed in firmware Q2B87. On BTest-2 systems, average NiMH lifetime in a test of multiple machines (Screen on, backlight fully on, wireless associated, all functional units including GPU on, but processor idle) was tested to be approximately 2h40m, LiFePo batteries were approximately 3h 10m, using BTest-2 systems. Early tests with BTest-4 systems show an idle system lifetime (no suspend) between four and five hours, depending on circumstances and battery type. The LiFePo batteries have significantly higher lifetime. This will improve as our power management improves and remaining unused devices are powered down when not in use.

RestrictedFormats: In some jurisdictions, patents on algorithms apply, and royalty payments may be required. Examples include MP3, and MPEG-4. This is a particular nuisance for media players, for which many of the common codecs algorithms are patented. In other jurisdictions, software patents do not apply and there are usually freely available implementations for these algorithms available. Sometimes, as in Adobe Flash, or the Real Helix player there are free (as in beer) implementations available, where those corporations have paid these patent royalties and made usually (binary) versions of codecs available. This has direct consequences as OLPC does not want to burden all machines with what may be unnecessary duplicate patent royalties: OLPC must therefore leave the customization of the distribution for these formats for "in country". For jurisdictions in which such patent laws apply, there are now solutions such as those sold by Fluendo to these issues. The Flash format (whether Adobe's Flash 9 or Gnash) illustrates this problem well; even though we can include gnash, as built it does not have support for MP3 or MPEG-4, which should work correctly if Gnash is rebuilt.

JFFS file system pathological use#1292: Writing log files (or similar files) one short piece at a time (unbuffered) and then flushing them to stable storage is bad for the flash, as it causes many unnecessary writes to the flash; much better would be to defer such writing until some amount of time has passed, and then flush, so that multiple small writes can be merged into a single write. Do not build applications with such behavior.

Network adapter causes slowdown#68: Fixed in Q2B81 firmware and later. Any network adapter, if configured, (including the built in Marvell wireless) would cause the system to slow as much as 33%.

Flash and system installs off SD: You can install the flash and system image off an SD card. Rather than using the "disk:" in the instructions for reflashing, you can install using the name "sd:". The auto updater does not work off of SD, however, at this time.

fontconfig cache is invalidated too easily on mtime check: Applications can take a very long time to start, due to a fontconfig caching bug provoked by the time being set incorrectly (which can happen easily if the battery is replaced or the time is set badly). To work around this problem, use the "date" command from a console to set the current time and date.

X Window System

X Window System open issues: specific to OLPC are found in trac.

Performance optimization: Much performance optimization work is possible, and awaits our time or volunteers to work on. Some work has been done by Jordan Crouse and others and performance is substantially better than initially.

B1 Touchpads: The BTest-1 touchpad worked particularly badly: much of this is caused by capacitive issues; a mylar sheet increased the capacitance and BTest-2's touchpad now functions pretty well. The writing (stylus) mode of the touchpad is enabled and works correctly in BTest-2, although additional software work is needed. When taking a unit off of power supply onto battery (or vice versa), the touchpad may need recalibration: simultaneously press the four keys in the extreme corners of the keyboard. BTest-4 touchpads seem to be more stable.

Tap on the touchpad: It may be possible to implement "tap" on the capacitive touch pad; we'd be interested in hearing opinions whether this is desirable for a child or not.

Keyboard autorepeat: has been "tuned". Most keys do not autorepeat, except for the arrow keys, erase key, space bar, and game pad and buttons by the screen.

Camera activity provokes X to screw up colormap on B2's#2617: The X Window System Xvideo extension is supported in the X server; note that a slightly different colormap is loaded while video is playing to improve video quality; other colors in use may become slightly strange during this period. Note that there is a miswiring from the Geode to the DCON chip, fixed in BTest-3 and BTest4, that complicates this problem. The LX processor won't have this problem at all; the RGB-YUV conversion is correct on that video unit. This is only a problem for B1 and B2 systems.

User Interface: Sugar

Shutdown: to shutdown completely, hover over the XO in the home view and click on 'Shutdown'. This is a graceful shutdown, preferred to holding the power button for more than 4 seconds, which summarily resets the machine.

Suspend: Momentarily press the power button.

Performance: Sugar performance has improved, particularly on the Geode LX processor found on B3 and later systems. The Journal is now capturing a log of all activities on the laptop and can be used to search and sort through old work and relaunch activities.

Screen Capture: Alt-1 does a screen capture and stores the result in the Journal.

USB Keys: USB keys are automatically mounted and their contents are viewable from within the Journal. Files can be dragged from the Journal or Clipboard onto the USB key from within the Journal. (USB file systems are still accessible from console and the developer's console through the standard Linux mechanisms.)

Mime Types: only a single activity can declare they handle a given mime type; the Journal does not yet provide a way to select which activity will be started.

Many of the user interface issues we intend to fix. Among the most notable issues are:

New networking UI needs documentation#989: To choose a network, push the first of the four circular "mesh view" keyboard buttons (or "F1" in an emulator), hover over each triangle until you find the access point you want to associate with, and then click on it. (Note that the access points are color-coded based upon a hash of the AP SSID. Therefore, once you learn the color of your desired access point, you can subsequently find it quickly.) The mesh, rather than being a triangle, is represented by a circular icon. You may be prompted for an access point's password.

Network Autoconfiguration: an XO will now autoconfigure the network. If no Internet access can be found, an ad-hoc mesh will be formed using private networks. If an XO is either associated with a conventional access point or preferably interfaced via a ethernet USB interface, it will automatically become a mesh portal point (MPP), and gateway the mesh network to the Internet. It will also associate with conventional access points using WEP or WPA. If it associates via WEP or WPA, the mesh portal functions cannot work, however.

WPA support#2019: has been implemented in the most recent builds, to allow association with WPA enabled access points. If you have problems, please use the developer's console and execute the command touch /etc/NetworkManager/log-supplicant and try again. Please attach the resulting log files /var/log/messages and /var/log/wpa_supplicant.log to a trac ticket, along with the exact manufacturer and model of the access point.

Bulletin board (shared workspace): support is not yet integrated into Sugar in a general way; harbingers of how it will work can be seen in the shared workspace in the Record activity.

Clipboard interaction (on the Frame): is not fully developed in all activities. Some activities can copy and paste (using Ctrl-C and Ctrl-V) to and from the clipboard and some even support drag and drop to and from the clipboard, but many do not.

Groups: are not yet exposed in the interface. Sharing, chat, etc. are only supported at the mesh level (open to everyone on the mesh).

Presence Service

PS open issues: can be found in trac

Connections: Telepathy connections are supported via the school server - a jabber XMPP server with some particular required features - as well as over the mesh network using Link Local XMPP.

Default Server: Build 542 no longer registers automatically with olpc.collabora.co.uk as the server, so registration is required before other XOs can be seen via the server.

Server Connections: Activity icons appearing in the mesh should disappear when everybody leaves that (shared) activity. However if the PS fails to announce somebody leaving (for example quitting the jhbuild emulator with alt-Q while in the activity#2616), then the icon remains on the mesh view#1935.

Large data over Tubes#2253: On server connections, large messages (such as images) are not broken up into chunks and hence fail, breaking sharing.

Link Local Connections#2702: If you share an activity and are not the last to leave, you cannot rejoin the shared activity. This is being addressed for Trial 3.

Activities

Many activities are under development and they can be found with their status in the wiki while the Activity Grid has the status of all of the activities that have systematic testing.

Web Browsing

Web Browser Open Issues: can be found in trac.

SSL sites without official certificates fail to load#542

Web activity has trouble with Arabic and Urdu fonts#884: This is being fixed upstream and should be in a future OLPC build.

The Xulrunner based brower uses the scaling engine from Firefox 1.9. Starting in build 303, this greatly improves browser behavior and font and image sizes more likely to be acceptable. Later builds improve yet further. With our high resolution screen, we have had to go "first" in innovation in web browser technology. Performance work still needs to be done, particularly to speed scaling of images. Google Maps and Google Talk now both work well. Please let us know when you find web sites with clear formatting problems.

Plug-ins should be installed in the directory /usr/lib/mozilla/plugins.

The current version ship with an free version of Flash, called gnash; it has improved substantially from Trial-1. Adobe's Flash plug in works fine, which many may find preferable until gnash matures further. As noted in RestrictedFormats, we cannot distribute gnash with patented codecs, though gnash can be rebuilt to support a wide range of datatypes.

The web browser does not ship with Java plug-in. Sun's Java and web browser plug-in work fine.

The web browser has no tabs, no zoom (yet), no provision for ebook mode (yet).

User experience has problems with pop windows, Frame interfering with scrolling.

Calculate

A simple calculator activity contributed by Mauro Torres et al. of the Tuquito Linux project in Argentina was replaced by a completely unexpected, more functional Calc activity written by Reinier Heeres at Harvard in build 385. Our thanks to both Mauro and Reinier for their efforts.

Chat

Chat open issues: can be found in trac

Chat has been restored to our builds. It now uses the Presence Service, so instead of a global chatroom, if you start Chat from the frame it will create its own room for you. When others join in the Neighbourhood view, the activity shows who has joined or left, and if you join it will display those who are already in the chat room.

It will convert URL's to clickable links for the web browser, and is a way to browse together until the web browser has shared browsing.

Developer Console

The developer console provides a set of tabs in a popup window on top of activities. It is launched by typing Alt-=.

The XO Resources tab shows basic information about the system, the recent CPU usage and flash usage

The Memphis tab returns information about executing processes. Memphis)

The Log Viewer tab allows exploration of many key system logs.

The Terminal tab provides a terminal emulator and shell.

The Presence tab provides logs of the presence service in raw form (the mesh view is a graphical interpretation of these logs), to aid in debugging one of our key new services.

Drawing Activity

Paint (Oficina) Issues: can be found in the trac system.

The application is fully written in Python, using only GTK features. It is being developed at LSI-USP in Brazil.

Etoys

The Etoys learning environment has been integrated into the Sugar environment, and you are encouraged to visit the Squeakland site. Sugar Etoys has information specific to Etoys in our Sugar environment.

Journal and Datastore

Note that removable media support is now present. When a USB key is inserted, Sugar will now automatically mount the USB stick and put an icon on the bottom of the journal; if you click on the icon, the journal on the USB stick will be shown. You can also unmount the stick using that icon by using the pop-up menu.

On an external device, the file name bears some resemblance of the name that may have been given to the journal entry, so you should be able to take a FAT formatted USB stick from an OLPC and mount it on Linux, Windows or MacIntosh to interchange files; on the JFFS2 file system right now it is simply a numeric has, which is arguably unfriendly.

The journal uses the underlying Datastore facility which is new; its issues are in our trac system. Note that it indexes all information on an external device; this issue:

Datastore should check versions and recreate indexes automatically#2627: has caused some trouble during its development, which we hope to prevent in the future.

Journal should give a choice of activities to resume an object with#2544: Only a single activity can register right now for a given mime-type; it should be possible for multiple activities to handle the same mime-type and the user be asked which to invoke.

Journal issues: can be found in our trac system.

Newsreader

Based on PenguinTV. A few RSS feeds of educational interest have been preprogrammed as examples:

Astronomy Picture of the Day
BBC News
EPOD - Earth Science Picture of the Day
Merriam-Webster's Word of the Day
Planet OLPC

Other feeds can easily be added/substituted.

Record

The primary record (still- and video-camera) activity is written by Erik Blankinship and Bakhtiar Mikhak. (The Etoys activity includes support for the camera.)

The BTest-2 system does not have a LED to indicate if the camera or microphone is enabled. Such a LED is present on BTest-3 and later systems.

Both the Record activity and Etoys can be used for playback; a version of Helix and a gstreamer player (roughly modeled on Totem) are available for Trial-2.

Read (aka xbook)

File viewer through the browser, or as a sugar activity. The PDF format view is brought to you by the poppler library and Cairo graphics library.

The xbook application has latent provision for ebook mode, awaiting a couple key bug fixes.

TamTam

The TamTam Release Notes: are available.

Turtle Art

Turtle Art is a logo-like application that draws colorful art via a turtle and scratch-like visual programming elements that snap together in compilable ways.

Integration with the journal is not complete at this time, and users are wise to show children how to save their work.

Watch and Listen

Videos and DVD's can be played back on the system, including RealNetwork formats. A Sugar version of Real's Helix player is available and installed; only Ogg format media is in the base install for the reasons outlined in [RestrictedFormats]. Please see the Helix Media Activity release notes for further details. A browser plug-in version for media playback is expected soon.

Note that it is likely there will be no icon for this activity in future versions, media playing being started by journal or browser activity.

Write

Write activity issues: can be found in trac.

Write share function FAIL after insert an image#2253: Sharing an image in Write will cause sharing to fail.

The Write activity is based on AbiWord. This activity is fully integrated in the Sugar environment, and provides an efficient, light weight text editor. It has support for reading various documents formats, such as Microsoft Word (.doc, .rtf), OpenDocument (.odt), (X)HTML (.html), and plain text (.txt). The core of this activity might be used for editing text in the wiki as well.

Games

Blockparty

A famous, simple game of falling blocks, often known as Tetris. Contributed by Vadim Gerasimov.

Connect

A version of Connect-4. Supports network play, and is useful as an example of how to use Sugar's collaboration facilities.

Note that Connect requires two players to function - the game cannot be played until you share it and another player joins. At this time there is no support for starting a new game once somebody wins - that will be a Trial 3 feature.

Temporary placeholders and Missing Pieces

There is no user interface for controlling the audio input and mixing. The workaround right now is to use "alsamixer" in a terminal window. Speaker volume is controllable by the slider. There is currently no visual feedback for changing the volume.

Our plans include a web server and wiki system MikMik, using an WYSIWYG editor based on the write activity (currently Abiword). This has a collaborative write capability we exploit.

Backlight control

The backlight can be controlled using F9 (dimmer) and F10 (brighter); With the backlight completely off, there is no color, and hardware anti-aliasing for the color screen is disabled. Likewise, volume is controlled by F11 (quieter) and F12 (louder).

School Server Notes

The school server software is not quite ready.

Laptop Registration

To register with a school server, you execute the command olpc-register from a command line in the developer console. This establishes the relationship of the laptop with the school server (named "schoolserver" in the local DNS domain). It also establishes a jabber server used by the presence service of the laptop. This should have a UI by Trial-3.

Laptop Backup to server

In the Journal, there is a Backup tab; you select that tab, and if your laptop is registered, it will backup to the school server.

OLPC Platform

Inventory of "permanent" packages

Inventory of "debug" packages

Inventory of "optional" packages (?)

Development environment

Languages - Logo, javascript, Python

Libraries

Where to find source

Many of the OLPC activities, kernel, and other software are in our git repository.

Internationalization/Localization (see Category:Language support & Category:Languages (international))

Other Multimedia Software

Other software that has been tested on the OLPC systems includes Adobe Flash, and Real's RealPlayer® and Sun's Java.

Finding the Latest Test Builds

Development and stable builds can be downloaded. Boot firmware is kept in this wiki. The latest stable firmware and system image combined into an easy to use package with a script to automate installation of the firmware and base image makes upgrades to the latest stable software extremely easy.

Enabling logging

Activity logging is now turned off by default. To turn on logs:

edit ~/.xinitrc and uncomment the line that imports .sugar.debug (It is the second last line of the file and there are commented instructions over it in the file itself)
in ~/.sugar.debug, add these lines -

export JOURNAL_DEBUG=yes            (to enable Journal Logs)

export SHELL_DEBUG=yes              (to enable Shell Logs)

export ACTIVITYNAME_DEBUG=yes       (to enable activity Logs where ACTIVITYNAME is that given in activity.info   file)

export SUGAR_EMULATOR=yes           (this shows me logs of all activities without having to enable logging for  each    activity)

OLPC Trial-2 Software Release Notes: Difference between revisions