Excellent information. Thank you. We just issued new 3945 uCode within the past week or two ... Is that also showing the problem (noise_diff = 0)? -- Ben -- >-----Original Message----- >From: Maxim Levitsky [mailto:maximlevitsky@xxxxxxxxx] >Sent: Tuesday, May 05, 2009 12:17 PM >To: Cahill, Ben M >Cc: iwlwifi maling list; linux-wireless >Subject: RE: [ipw3945-devel] IWL3945 always reports noise >levels of -127 > >On Tue, 2009-05-05 at 17:50 +0300, Maxim Levitsky wrote: >> On Mon, 2009-05-04 at 12:27 -0700, Cahill, Ben M wrote: >> > >> > >-----Original Message----- >> > >From: Maxim Levitsky [mailto:maximlevitsky@xxxxxxxxx] >> > >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. > > >Indeed old microcode reports values like that: >rssi:017 agc:000 sig_avg:5437 noise_diff:580 > > >New microcode reports this instead: >rssi:018 agc:000 sig_avg:140 noise_diff:000 > > >noise_diff is always zero now, and range for sig_avg changed. > >I also noticed that with older firmware I couldn't set the tx speed >Thus what recently fixed it was a firmware update! >(But in both cases OFDM rated were used) > >Thats all nothing to debug any more here. > > >Best regards, > Maxim Levitsky > >-- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
