Re: Intel 4965 HT rates

[Zhu Yi <yi.zhu@intel.com>]

On Mon, 2009-12-21 at 05:52 -0800, Gábor Stefanik wrote:
> On Mon, Dec 21, 2009 at 3:44 AM, Zhu Yi <yi.zhu@intel.com> wrote:
> > On Mon, 2009-12-21 at 10:33 +0800, Guy, Wey-Yi W wrote:
> >> For 4965, 40MHz only supported in g band
> >
> > We don't support 40MHz channels in 2.4G band. See comments in
> > iwl-eeprom.h:
> >
> >  *
> >  * NOTE:  4965 does not support HT40 channels on 2.4 GHz.
> >  */
> But why does the Windows driver for 4965 support it then?

Can you dump your 4965 eeprom and see if the channels in band 6 (2.4GHz
40MHz channel band) are valid? You can use modparam "debug=1" and grep
'HT40' in dmesg. If the flag is 0x0, the channel is marked as invalid by
EEPROM. The Linux driver simply excludes the HT40 channel in this case.

Thanks,
-yi

> >>  -----Original Message-----
> >> From:         Valentin Manea [mailto:linux-wireless@mrs.ro]
> >> Sent: Sunday, December 20, 2009 05:38 AM Pacific Standard Time
> >> To:   linux-wireless@vger.kernel.org
> >> Subject:      Intel 4965 HT rates
> >>
> >> Hi,
> >>
> >>   I'm running compat-wireless-2.6.33-rc1 and iw list shows some confusing HT
> >> capabilities:
> >>         Band 1:
> >>                 HT capabilities: 0x082c
> >>                         * 20 MHz operation
> >>                         * SM PS disabled
> >>                         * 20 MHz short GI
> >>                         * max A-MSDU len 7935
> >>
> >> but for 802.11a channels:
> >>         Band 2:
> >>                 HT capabilities: 0x086e
> >>                         * 20/40 MHz operation
> >>                         * SM PS disabled
> >>                         * 20 MHz short GI
> >>                         * 40 MHz short GI
> >>                         * max A-MSDU len 7935
> >>
> >> While I can't tell when this happened, I remember older 2.6.29 releases
> >> supported HT40 for both bands.
> >> The wireless card is an Intel 4965 on a Thinkpad T61.
> >>
> >>
> >> Regards,
> >> Valentin
> >>
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> 
>