OLPC XO 1.5 overheating problems

[John Watlington]

On Oct 6, 2009, at 4:55 AM, Tiago Marques wrote:

> Hi John,
>
> On Tue, Oct 6, 2009 at 6:45 AM, John Watlington <wad at laptop.org>  
> wrote:
>>
>> On Oct 3, 2009, at 12:16 PM, Tiago Marques wrote:
>>
>>> On Sat, Oct 3, 2009 at 4:19 PM, Ed McNierney <ed at laptop.org> wrote:
>>>>
>>>> Tiago -
>>>>
>>>> Well, everyone gets to contribute something to thermal problems :-)
>>
>> Actually, the average heat sources are (in descending order): the  
>> companion
>> chip (graphics engine, memory interface, and peripherals), the  
>> CPU, the
>> DDR2,
>> the WLAN (!), and the clock generator.  At peak operation, the  
>> processor
>> wins.
>
> I see, never thought the VX855 would dissipate so much while idling,
> perhaps VIA doesn't do clock gating?

I said average.  The VX855 does much of the heavy lifting for the  
system,
including interfacing to DDR2, and the CPU FSB.  It includes the  
graphics
engine, the display engine, and all peripheral interfaces.
Yes, Via does a lot of clock gating.

Cheers,
wad