[maemo-users] N800 wifi power usage

From: Kalle Valo Kalle.Valo at nokia.com
Date: Tue Apr 10 09:08:40 EEST 2007
"ext Michael Wetherell" <mike.wetherell at ntlworld.com> writes:

> I've found that applications that make fairly heavy use of the wlan for 
> more than a few minutes make the whole machine unstable. I'm wondering 
> if it is the same for everyone, or is there a fault with this 
> particular machine?

It might be a software problem or a hardware problem, difficult to
say. At least I'm not aware of such severe WLAN bugs currently. If
it's a software bug, it might related to your Access Point or radio
environment. There might be cases which could trigger some strange
bugs which others don't see. If possible, try running exactly the same
test cases in a different location with a differect AP.

What AP are using and what are the settings?

Also try to file a bug report about the issue. That way it would
easier to track.

> E.g. video plays fine if the video is copied onto the flash, but playing 
> it directly from a http server across the wlan causes the machine to 
> reboot after 10 minutes or so (that's with a full battery, sooner 
> otherwise).
> Similarly downloading, e.g. downloading large files with wget from a 
> local server that runs the wifi flat out, works for 10 mins or so then 
> it reboots or the wlan goes dead.

That's bad, it should not behave like that at all. Naturally we do
extensive testing before we release the software, and we haven't seen
anything like that.

> I saw there was a thread about dynamic PSM a few weeks ago, so I've 
> tried setting it to 0, i.e. full PSM. It reduces throughput which I 
> don't mind, but I'm not sure how much it helps with stability, I think 
> maybe a bit.

Actually that might make the things worse. Try with 120000 instead,
with the newest software it will disable PSM altogether. It might
help, or not. But be aware that disabling PSM will drain your battery
really quickly, for example in 6 hours if the display is turned off.

Kalle Valo

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