[maemo-users] Power consumption and WLAN APs

From: Kalle Valo kalle.valo at nokia.com
Date: Wed Jul 23 22:43:19 EEST 2008
"ext Frederic Crozat" <fred at crozat.net> writes:

>> Why is PSM so fragile then? Since I can't sleep (jet lag, argh), I'll
>> write a bit about this.
> <snip>
> wow, thanks for the detail explanations. I kind of better understand
> PSM issues.


>>> A first bug was found in ralink proprietary driver which was losing
>>> AP association after some time in PSM mode, which was fixed by
>>> Ralink.
>> Hmm, I would first suspect that the AP is not really buffering all
>> frames. I have seen APs which periodically send Null frames to check
>> that the client is really alive. Maybe the AP vendor forgot to check
>> if the client is sleeping when they send the Null frame? Wouldn't be
>> the first.
> I've forwarded your email to Freebox engineer ;)


>> But what I could do is to analyse the problem myself. It would take
>> only an hour or two, including writing a small report about the
>> problem which I can send everyone interested (hopefully this includes
>> the vendor). So if you would be able to convince the vendor to send
>> the AP for a loan? If that's not possible, are you coming to Maemo
>> Summit? If I manage to come and you can take the AP with you, I could
>> take a look at it onsite.
> Unfortunately, it won't be possible because Freebox (the name of
> set-top-box = ADSL modem + wifi mimo router + many other nice things)
> can only work when they are synchronized over ADSL with Free ISP
> DSLAM. So, even if we could send you a Freebox, you couldn't do
> anything with it :(

This is getting difficult. So if your ADSL line is dead for a day your
WLAN AP will not work, did I understand this right? If yes, that sucks
big time.

> Anyway, I've pinged Freebox engineer in hope they might have a clue on
> the issue.

That's your only chance, unfortunately. I would assume now that WLAN
is getting more popular in mobile phones they would get more pressure
to fix this. Let's hope for the best.

>> BTW, is there a bug about this? If not, please file one. I'll forward
>> it to our IOP testers so that they could try get access to the AP as
>> well.
> Done : https://bugs.maemo.org/show_bug.cgi?id=3481

Thanks a lot.

Kalle Valo

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