RE: [ipw3945-devel] IWL3945 always reports noise levels of -127

Maxim Levitsky
2009-05-05T14:50:40Z

On Mon, 2009-05-04 at 12:27 -0700, Cahill, Ben M wrote:
>
> >-----Original Message-----
> >From: Maxim Levitsky [mailto:maximlevitsky@gmail.com]
> >Sent: Monday, May 04, 2009 3:04 PM
> >To: Cahill, Ben M
> >Cc: iwlwifi maling list; linux-wireless
> >Subject: RE: [ipw3945-devel] IWL3945 always reports noise
> >levels of -127
> >
> >On Mon, 2009-05-04 at 11:53 -0700, Cahill, Ben M wrote:
> >> When one of our devices cannot figure out what the actual
> >noise level is, it reports -127.
> >>
> >> Newer devices are better at old devices at figuring noise
> >level. IIRC, 3945 cannot figure noise for CCK signals, and
> >may not be possible with OFDM as well.
> >
> >Why then it did work on older kernel ?
> >(and noise levels seemed to be correct)
>
> Hmmm, good point, and I don't know the answer! :-(
>

And I do know it now (this is what I suspected...)
This is firmware issue.

I forced the driver to use older firmware iwlwifi-3945-1.ucode,
and noise levels are back.

Regards,