New XO-1.5 10.2.0 build 124
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 videos * sugar*: Merge Bernie's work on 3G modem support for Sugar * SDL_Pango, #9994: Add SDL_Pango to build for Tuxmath activity * Pull F11 updates. Package changes since build 123: -NetworkManager-0.7.2.996-1.fc11.i586 +NetworkManager-0.7.2.997-1.fc11.i586 -NetworkManager-glib-0.7.2.996-1.fc11.i586 +NetworkManager-glib-0.7.2.997-1.fc11.i586 -NetworkManager-gnome-0.7.2.996-1.fc11.i586 +NetworkManager-gnome-0.7.2.997-1.fc11.i586 +SDL_Pango-0.1.2-10.i586 -bootfw-q3a38-1.unsigned.i386 +bootfw-q3a39-1.unsigned.i386 -elfutils-libelf-0.145-1.fc11.i586 +elfutils-libelf-0.147-1.fc11.i586 -exim-4.69-10.fc11.i586 -kernel-2.6.31_xo1.5-20100504.1641.1.olpc.7223ce6.i586 +kernel-2.6.31_xo1.5-20100505.1840.1.olpc.b072a92.i586 -kernel-firmware-2.6.31_xo1.5-20100504.1641.1.olpc.7223ce6.i586 +kernel-firmware-2.6.31_xo1.5-20100505.1840.1.olpc.b072a92.i586 -libpurple-2.6.6-2.fc11.i586 +libpurple-2.7.0-1.fc11.i586 -olpc-runin-tests-0.9.19-1.noarch +olpc-runin-tests-0.9.20-1.noarch -olpc-utils-1.0.22-1.fc11.i586 +olpc-utils-1.0.22-2.fc11.i586 -ppp-2.4.4-12.fc11.i586 +ppp-2.4.4-13.fc11.i586 -quota-3.17-6.fc11.i586 +quota-3.17-7.fc11.i586 +ssmtp-2.61-14.fc11.i586 -sugar-0.84.15-1.fc11.i586 +sugar-0.84.16-1.fc11.i586 -sugar-artwork-0.84.1-3.fc11.i586 +sugar-artwork-0.84.2-1.fc11.i586 -sugar-presence-service-0.84.0-2.fc11.noarch +sugar-presence-service-0.84.1-1.fc11.noarch +sugar-toolkit-0.84.10-1.fc11.i586 -sugar-toolkit-0.84.9-2.fc11.i586 -taglib-1.6.1-2.fc11.i586 +taglib-1.6.3-1.fc11.i586 -tzdata-2010i-1.fc11.noarch +tzdata-2010j-1.fc11.noarch -xapian-bindings-python-1.0.18-1.fc11.i586 +xapian-bindings-python-1.0.20-1.fc11.i586 -xapian-core-libs-1.0.18-1.fc11.i586 +xapian-core-libs-1.0.20-1.fc11.i586 ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Announcing Q2E43 firmware for XO-1
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 to q2e42). Changes since q2e41 include key delegation, various improvements in USB, SD, FAT, and ext2 handling, secure booting of Windows XP. ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Review & pull request: dracut-modules-olpc
On 10 May 2010 14:37, Martin Langhoff 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 Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
One family's solution to XO-1 touchpad
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) did not last long. The family added external wireless mice. Now their daughters are very happy with the XO-1 cursor behavior. mikus ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Interesting repair/modifying material
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. The Nigerian deployment, I seem to remember, was having problems with laptops slipping. Well, I've played around with this stuff, and if you put a few big spots on, your XO's not going anywhere. Fix keyboards. It cures into silicone, and doesn't offgas acetic acid. Fix cracked cases. Even more drop-protection: go around the sides with a big thick layer of Sugru (but watch out for the seams!) More waterproofing for the display: Put a layer around the metal part of the display, facing forwards. Don't put the display back into the XO until it cures, or it'll make the display non-removable. Now you can splash near anything right on the display and not worry about anything. Nope, I'm not getting paid to plug this stuff, I just think it's awesome. You can't buy it right now, unfortunately, they're out of stock. But their slogan is "Hack things better", so someone at OLPC might want to get in touch with them. - Nate ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: recycling chargers
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 which can tolerate 5W (4,7ohm, 9W for example) ! Ismael 2010/5/13 Sascha Silbe > 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 switched-on XO-1 connected to it. The XO-1 barely coped (the power >>> light started flickering some time ago, probably due to the power supply >>> aging and delivering an even lower voltage than before) and the XO-1.5 >>> (without MPPT ECO) didn't like it at all (whining noise, LED off). >>> >>> Summary: If you're trying to replicate this setup, make sure your PC >>> power supply regulates the 12V rail (just hook up some load and check the >>> voltage). >>> >> > 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. >> > In what way is that different from what I wrote? Or are you saying that > once I draw a certain amount of current from the 5V rail, the 12V one will > be properly regulated (i.e. keeping the voltage stable at 12V +/- 10% > regardless of the current draw on the 12V rail)? > > > > CU Sascha > > -- > http://sascha.silbe.org/ > http://www.infra-silbe.de/ > > -BEGIN PGP SIGNATURE- > Version: GnuPG v1.4.10 (GNU/Linux) > > iQEcBAEBCgAGBQJL7ApLAAoJELpz82VMF3DacX4H+wdaJccvnIKGh8+7CvdAeQnQ > FuhShcjiM3h6MzZTPxLXH4KjDm8upzGCtPJlNLGl9izL+MPizGdebiufMRujeouH > ZZk3Da/RhtIsugKPKYLVBuXo2bGX6vG4Jsm4VExRHWxQjS8WBV6UTW2iYMOkOjt4 > Awb78u/K9A/WoS6L2Az/ZTRvs1VHiprdWoMtGtLJA13FJ5LZaixuTmWk14ZCAMRK > NdGM3sD36PJzUlHejDDJADxWeLhLnkbbLDaf+AbS3rQYGpTbNnVEh80yiWRKYTkp > JYc5YMAjsXyKelMmVJaiQRfea2juJ3rUALn/rq1F4xL74rVSm273D5dxVS3tbbU= > =QlEW > -END PGP SIGNATURE- > > ___ > Devel mailing list > Devel@lists.laptop.org > http://lists.laptop.org/listinfo/devel > > -- Ismael Schinca Plan Ceibal - Depto. Técnico - I+D Avda. Italia 6201 Montevideo - Uruguay. Tel.: 601 57 73 Int. 2227 E-mail : ischi...@plan.ceibal.edu.uy ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: recycling chargers
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 5V rail, so the 12V rail dropped down to 9V with a >>> switched-on XO-1 connected to it. The XO-1 barely coped (the power light >>> started flickering some time ago, probably due to the power supply aging >>> and delivering an even lower voltage than before) and the XO-1.5 (without >>> MPPT ECO) didn't like it at all (whining noise, LED off). >>> >>> Summary: If you're trying to replicate this setup, make sure your PC power >>> supply regulates the 12V rail (just hook up some load and check the >>> voltage). > >> 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. > In what way is that different from what I wrote? Or are you saying that once > I draw a certain amount of current from the 5V rail, the 12V one will be > properly regulated (i.e. keeping the voltage stable at 12V +/- 10% regardless > of the current draw on the 12V rail)? Your latter statement is correct. There is usually a "main rail" (+5V or +3.3V) which must be loaded for the "auxiliary rails" (+12V) to be regulated. Cheers, wad ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: recycling chargers
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 switched-on XO-1 connected to it. The XO-1 barely coped (the power light started flickering some time ago, probably due to the power supply aging and delivering an even lower voltage than before) and the XO-1.5 (without MPPT ECO) didn't like it at all (whining noise, LED off). Summary: If you're trying to replicate this setup, make sure your PC power supply regulates the 12V rail (just hook up some load and check the voltage). 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. In what way is that different from what I wrote? Or are you saying that once I draw a certain amount of current from the 5V rail, the 12V one will be properly regulated (i.e. keeping the voltage stable at 12V +/- 10% regardless of the current draw on the 12V rail)? CU Sascha -- http://sascha.silbe.org/ http://www.infra-silbe.de/ signature.asc Description: Digital signature ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: recycling chargers
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 rail. You must take this into account. You can be sure that the CPU connector and the PCI-X connector for the VGA will always have separate rails as those are the bigger power draws in a PC. Ismael 2010/5/13 John Watlington > > 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 enough load when > debugging systems which weren't loaded enough to maintain > regulation. > > Cheers, > wad > > On May 13, 2010, at 5:43 AM, Sascha Silbe wrote: > > > 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 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 switched-on XO-1 connected to it. The XO-1 barely coped (the power > light started flickering some time ago, probably due to the power supply > aging and delivering an even lower voltage than before) and the XO-1.5 > (without MPPT ECO) didn't like it at all (whining noise, LED off). > > > > Summary: If you're trying to replicate this setup, make sure your PC > power supply regulates the 12V rail (just hook up some load and check the > voltage). > > > > CU Sascha > > > > -- > > http://sascha.silbe.org/ > > > http://www.infra-silbe.de/___ > > Devel mailing list > > Devel@lists.laptop.org > > http://lists.laptop.org/listinfo/devel > > ___ > Devel mailing list > Devel@lists.laptop.org > http://lists.laptop.org/listinfo/devel > -- Ismael Schinca Plan Ceibal - Depto. Técnico - I+D Avda. Italia 6201 Montevideo - Uruguay. Tel.: 601 57 73 Int. 2227 E-mail : ischi...@plan.ceibal.edu.uy ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: recycling chargers
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 enclosed. But we tried it and it worked fine with only the power supply fan. Ismael 2010/5/13 Sascha Silbe > 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 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 > switched-on XO-1 connected to it. The XO-1 barely coped (the power light > started flickering some time ago, probably due to the power supply aging and > delivering an even lower voltage than before) and the XO-1.5 (without MPPT > ECO) didn't like it at all (whining noise, LED off). > > Summary: If you're trying to replicate this setup, make sure your PC power > supply regulates the 12V rail (just hook up some load and check the > voltage). > > CU Sascha > > -- > http://sascha.silbe.org/ > http://www.infra-silbe.de/ > -BEGIN PGP SIGNATURE- > Version: GnuPG v1.4.10 (GNU/Linux) > > iQEcBAEBCgAGBQJL68nFAAoJELpz82VMF3DahUEH/A2cg/SpM9edBRh80iBQ02cU > 5UYmYbEFk1k+SIc5zq/z9LfvUZC3oE5o+UNhbI22zoB8fot7mJ7gxqo+wOzYdi2v > 0OI7BPeU4rkqmApGYWlWXiqiQQeNjm862a+R+V1rBUkwP8rgzzp0Dhq4WYhNiXr1 > gKBfXARVhdXAJggyIGtDMcltiVEI/EJbOgfhZO94F8786H1rgQ1H2C80rSclympj > mrkGRX2p0c7lCohiyW1jNkVhFpQeivuzh0v2nHgN/p3CYtUPHR2qABEotHG61h2t > cWt2oDCTYFzDiW9KwIrrSTHxNDHNZgoDZwKZbi56wo1uc6Fhi/D3ayyXjcmkdqQ= > =ta5+ > -END PGP SIGNATURE- > > ___ > Devel mailing list > Devel@lists.laptop.org > http://lists.laptop.org/listinfo/devel > > -- Ismael Schinca Plan Ceibal - Depto. Técnico - I+D Avda. Italia 6201 Montevideo - Uruguay. Tel.: 601 57 73 Int. 2227 E-mail : ischi...@plan.ceibal.edu.uy ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: recycling chargers
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 enough load when debugging systems which weren't loaded enough to maintain regulation. Cheers, wad On May 13, 2010, at 5:43 AM, Sascha Silbe wrote: > 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 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 > switched-on XO-1 connected to it. The XO-1 barely coped (the power light > started flickering some time ago, probably due to the power supply aging and > delivering an even lower voltage than before) and the XO-1.5 (without MPPT > ECO) didn't like it at all (whining noise, LED off). > > Summary: If you're trying to replicate this setup, make sure your PC power > supply regulates the 12V rail (just hook up some load and check the voltage). > > CU Sascha > > -- > http://sascha.silbe.org/ > http://www.infra-silbe.de/___ > Devel mailing list > Devel@lists.laptop.org > http://lists.laptop.org/listinfo/devel ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: #10045 HIGH 1.5-sof: XO-1.5 Record audio/video are out of sync with each other
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 size of the buffer memory, if the > data rate from the camera exceeds the rate at which we can write to SD, > there will be skips once a recording is long enough to fill the buffer. ... > So we determine the data rate by choosing height, width, and frame rate > from the camera. We determine the maximum rate according to the choice > of SD media. If I understand correctly, Record does compress the video on the fly. It's the audio that it writes uncompressed to disk for later compression and muxing. I don't know at what quality it performs audio recording, but it might be as low as 32 KB/s uncompressed. --Ben signature.asc Description: OpenPGP digital signature ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: recycling chargers
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 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 switched-on XO-1 connected to it. The XO-1 barely coped (the power light started flickering some time ago, probably due to the power supply aging and delivering an even lower voltage than before) and the XO-1.5 (without MPPT ECO) didn't like it at all (whining noise, LED off). Summary: If you're trying to replicate this setup, make sure your PC power supply regulates the 12V rail (just hook up some load and check the voltage). CU Sascha -- http://sascha.silbe.org/ http://www.infra-silbe.de/ signature.asc Description: Digital signature ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: recycling chargers
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 supply is being used as a 12V DC regulated source. The original PC power harness cables have been removed. I suggest that to increase the lifetime of the cables, they be wrapped with electrical insulating tape at the point they exit the power supply, and anchored to the chassis of the power supply with a nylon wire tie. -- James Cameron http://quozl.linux.org.au/ ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
recycling chargers
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
Re: #10045 HIGH 1.5-sof: XO-1.5 Record audio/video are out of sync with each other
On Wed, May 12, 2010 at 10:31:50AM -0400, Martin Langhoff wrote: > On Wed, May 12, 2010 at 1:46 AM, James Cameron 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 0.1s 44ms 15ms 8ms, median 85us, smallest sample 80us). > > Great! Must say that dirty_ratio=90 seems high -- default is 20, which > is 20% of available memory. It implies buffering as much as possible. This is also evident in the write syscall latency distribution. > can you test with > > vm.dirty_writeback_centisecs=100 # frequent pdflush process wakeups > vm.dirty_expire_centisecs=500 # make data qualify for pdflush earlier > vm.dirty_background_ratio=10 # pdflush should start working early > vm.dirty_ratio=30 # or maybe 40 -- this is the backstop > > this should kickoff a background writer early, and make data "ripe" > for it to flush early too. Tested. I used dirty_ratio of 40%. Changes the particular test to take 44 seconds in dd, 110 seconds in sync (an equivalent time differently distributed), and write syscall latency largest samples are 11, 9, 8, 7, and 0.44 seconds. 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 size of the buffer memory, if the data rate from the camera exceeds the rate at which we can write to SD, there will be skips once a recording is long enough to fill the buffer. (The dirty_* parameters help us change how the kernel responds to these writes, but we could equally well add a software buffer ... in the end we use more RAM for no gain.) So we determine the data rate by choosing height, width, and frame rate from the camera. We determine the maximum rate according to the choice of SD media. Working with uncompressed data is marginally preferrable to on the fly compression ... using on the fly, the avoidance of delays would depend on the compression ratio, which would depend on the complexity of the changes from frame to frame. Hand waving becomes expensive. If we can get smooth recording at chosen video source rates, without compression, to our SD media, then on the fly compression should work fine. -- James Cameron http://quozl.linux.org.au/ ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
