Re: Use of XO-1 power adapters w. XO-1.5
http://dev.laptop.org/ticket/9476 narrows it down to a specific model of 15W adapter. The 17W adapters that I tried worked. John Watlington wrote: > > Mitch, >Regarding your note on IRC about power adapters: > no, I hadn't noticed any problems with using XO-1 > adapters with XO-1.5 laptops. > > There are various flavors of XO-1 adapters, in 15 and 17W > flavors, from multiple vendors. At B2 bringup we had problems > with a prototype they had lying around that failed spec. > > We are definitely drawing too much from the XO-1 adapters when > charging a battery. The question is how the adapter handles it. > Some drop their voltage below that which the XO can really use. > > The MPPT algorithm should handle this, if we ever get around > to implementing it. > > Cheers, > wad ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Use of XO-1 power adapters w. XO-1.5
Mitch, Regarding your note on IRC about power adapters: no, I hadn't noticed any problems with using XO-1 adapters with XO-1.5 laptops. There are various flavors of XO-1 adapters, in 15 and 17W flavors, from multiple vendors. At B2 bringup we had problems with a prototype they had lying around that failed spec. We are definitely drawing too much from the XO-1 adapters when charging a battery. The question is how the adapter handles it. Some drop their voltage below that which the XO can really use. The MPPT algorithm should handle this, if we ever get around to implementing it. Cheers, wad ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
OLPC on BBC Click
Hi All, The Click program on BBC this week has a very interesting segment on Rwanda and their IT goals. It features the OLPC quite a bit with a lot of footage of the XO. The online article can be read at the link below. People in the UK can see the episode on the BBC this week or on BBC iPlayer. I'm going to try and see if there's a standard online version of the video for those people not in the UK. Cheers, Peter http://news.bbc.co.uk/1/hi/programmes/click_online/8285496.stm ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
OLPC XO 1.5 overheating problems
On Sat, Oct 3, 2009 at 4:19 PM, Ed McNierney wrote: > Tiago - > > Well, everyone gets to contribute something to thermal problems :-) Indeed! > But the CPU's the main source and also provides internal throttling >mechanisms to > manage it (along with the external heatspreader mechanisms, of course). I hope that the heatspreaders might fit in your budget for the machine. I've seen all kinds of bad happen to machines where throttling was necessary. >The A-phase boards were designed to get the thing up and running, and for > A-phase machines (produced only in the dozens) it's completely OK to tell > folks to do all kinds of funky things to keep them running. Of course. I was hoping a more robust solution would be put in place for the subsequent versions but I was a bit apprehensive when I read the report on B2. I know it's not much, or anything even, but if someone there ever needs any help with issues like those, do contact me, I'd love to help where I can(brainstorming solutions maybe?). I have a good experience about cooling electronic components from years dealing with parts not very well engineered from perhaps every computer hardware manufacturer there is. > > No, the FTL is integral to the microSD card itself, so we're not using (and > don't need) an external FTL for it. Ok, tks! Keep up the great work. Best regards, Tiago Marques > > - Ed > > > On Oct 3, 2009, at 10:56 AM, Tiago Marques wrote: > >> Hi Ed, >> >> I was wondering if it's related to the CPU or Northbridge. I said the >> description was unclear to me because it didn't mention where the >> overheating was from, or if you had already found the problem. Some >> videos of pre production units were shown running with just a square >> of thermal interface material acting as an heatspreader and I found >> that odd, even for alpha level units, that Quanta was shipping them >> back to you that way. >> >> Also, I'd like to ask something off topic(better to post another >> mail?) but I couldn't find any description on the wiki about the flash >> controller. Are you still using one - and if so which - or are you >> just using the microSD card's FTL? >> >> Best regards, >> Tiago Marques >> >> On Sat, Oct 3, 2009 at 3:34 PM, Ed McNierney wrote: >>> >>> Tiago - >>> >>> Sure, but what kind of elaboration would you like? These are >>> pre-production >>> machines and have an assortment of problems, this being one of them. I >>> think the description is pretty clear; if you have a question about it >>> please let us know - thanks! >>> >>> - Ed >>> >>> >>> On Oct 3, 2009, at 10:13 AM, Tiago Marques wrote: >>> Hi all, Hope this is the appropriate list to post this, I apologize if not. Please be kind to redirect me to the appropriate one if so. Referring to: "The B2 prototypes have shown a tendency to overheat. We are working on a more respectable solution than simply throttling back the processor. In the meantime, be aware that the laptop may begin to function erratically if it gets too hot. This usually manifests itself as problems reading/writing the internal SD card. " Can someone please elaborate on this? Best regards, Tiago Marques ___ 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: OLPC XO 1.5 overheating problems
Tiago - Well, everyone gets to contribute something to thermal problems :-) But the CPU's the main source and also provides internal throttling mechanisms to manage it (along with the external heatspreader mechanisms, of course). The A-phase boards were designed to get the thing up and running, and for A-phase machines (produced only in the dozens) it's completely OK to tell folks to do all kinds of funky things to keep them running. No, the FTL is integral to the microSD card itself, so we're not using (and don't need) an external FTL for it. - Ed On Oct 3, 2009, at 10:56 AM, Tiago Marques wrote: > Hi Ed, > > I was wondering if it's related to the CPU or Northbridge. I said the > description was unclear to me because it didn't mention where the > overheating was from, or if you had already found the problem. Some > videos of pre production units were shown running with just a square > of thermal interface material acting as an heatspreader and I found > that odd, even for alpha level units, that Quanta was shipping them > back to you that way. > > Also, I'd like to ask something off topic(better to post another > mail?) but I couldn't find any description on the wiki about the flash > controller. Are you still using one - and if so which - or are you > just using the microSD card's FTL? > > Best regards, > Tiago Marques > > On Sat, Oct 3, 2009 at 3:34 PM, Ed McNierney wrote: >> Tiago - >> >> Sure, but what kind of elaboration would you like? These are pre- >> production >> machines and have an assortment of problems, this being one of >> them. I >> think the description is pretty clear; if you have a question about >> it >> please let us know - thanks! >> >>- Ed >> >> >> On Oct 3, 2009, at 10:13 AM, Tiago Marques wrote: >> >>> Hi all, >>> >>> Hope this is the appropriate list to post this, I apologize if not. >>> Please be kind to redirect me to the appropriate one if so. >>> >>> Referring to: >>> >>> "The B2 prototypes have shown a tendency to overheat. We are working >>> on a more respectable solution than simply throttling back the >>> processor. In the meantime, be aware that the laptop may begin to >>> function erratically if it gets too hot. This usually manifests >>> itself >>> as problems reading/writing the internal SD card. " >>> >>> Can someone please elaborate on this? >>> >>> Best regards, >>> Tiago Marques >>> ___ >>> 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: OLPC XO 1.5 overheating problems
Hi Ed, I was wondering if it's related to the CPU or Northbridge. I said the description was unclear to me because it didn't mention where the overheating was from, or if you had already found the problem. Some videos of pre production units were shown running with just a square of thermal interface material acting as an heatspreader and I found that odd, even for alpha level units, that Quanta was shipping them back to you that way. Also, I'd like to ask something off topic(better to post another mail?) but I couldn't find any description on the wiki about the flash controller. Are you still using one - and if so which - or are you just using the microSD card's FTL? Best regards, Tiago Marques On Sat, Oct 3, 2009 at 3:34 PM, Ed McNierney wrote: > Tiago - > > Sure, but what kind of elaboration would you like? These are pre-production > machines and have an assortment of problems, this being one of them. I > think the description is pretty clear; if you have a question about it > please let us know - thanks! > > - Ed > > > On Oct 3, 2009, at 10:13 AM, Tiago Marques wrote: > >> Hi all, >> >> Hope this is the appropriate list to post this, I apologize if not. >> Please be kind to redirect me to the appropriate one if so. >> >> Referring to: >> >> "The B2 prototypes have shown a tendency to overheat. We are working >> on a more respectable solution than simply throttling back the >> processor. In the meantime, be aware that the laptop may begin to >> function erratically if it gets too hot. This usually manifests itself >> as problems reading/writing the internal SD card. " >> >> Can someone please elaborate on this? >> >> Best regards, >> Tiago Marques >> ___ >> 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: OLPC XO 1.5 overheating problems
Tiago - Sure, but what kind of elaboration would you like? These are pre- production machines and have an assortment of problems, this being one of them. I think the description is pretty clear; if you have a question about it please let us know - thanks! - Ed On Oct 3, 2009, at 10:13 AM, Tiago Marques wrote: > Hi all, > > Hope this is the appropriate list to post this, I apologize if not. > Please be kind to redirect me to the appropriate one if so. > > Referring to: > > "The B2 prototypes have shown a tendency to overheat. We are working > on a more respectable solution than simply throttling back the > processor. In the meantime, be aware that the laptop may begin to > function erratically if it gets too hot. This usually manifests itself > as problems reading/writing the internal SD card. " > > Can someone please elaborate on this? > > Best regards, > Tiago Marques > ___ > 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
OLPC XO 1.5 overheating problems
Hi all, Hope this is the appropriate list to post this, I apologize if not. Please be kind to redirect me to the appropriate one if so. Referring to: "The B2 prototypes have shown a tendency to overheat. We are working on a more respectable solution than simply throttling back the processor. In the meantime, be aware that the laptop may begin to function erratically if it gets too hot. This usually manifests itself as problems reading/writing the internal SD card. " Can someone please elaborate on this? Best regards, Tiago Marques ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
