ath9k_htc: Issue with channel 52 and above (DFS?)

ath9k_htc: Issue with channel 52 and above (DFS?)

[Xose Vazquez Perez]

Michael Leun wrote:

> ath9k_htc based card I see the same AP only if it operates on channel
> 36-48, I do NOT see it in iwlist scan results if it is on channel 52 to
> 140 - I again see it when it is on 149 or above.

This "Virgin Media" device, aka Netgear WNDA3200, is selling with a
world roaming regulatory domain = 0x65.

[ 1547.403743] ath: EEPROM regdomain: 0x65
[ 1547.403745] ath: EEPROM indicates we should expect a direct regpair map
[ 1547.403748] ath: Country alpha2 being used: 00
[ 1547.403750] ath: Regpair used: 0x65

And it's restricted *by the driver* to:

                 Frequencies:
                         * 5180 MHz [36] (30.0 dBm) (passive scanning, no IBSS)
                         * 5200 MHz [40] (30.0 dBm) (passive scanning, no IBSS)
                         * 5220 MHz [44] (30.0 dBm) (passive scanning, no IBSS)
                         * 5240 MHz [48] (30.0 dBm) (passive scanning, no IBSS)
                         * 5260 MHz [52] (30.0 dBm) (passive scanning, no IBSS, radar detection)
                         * 5280 MHz [56] (30.0 dBm) (passive scanning, no IBSS, radar detection)
                         * 5300 MHz [60] (30.0 dBm) (passive scanning, no IBSS, radar detection)
                         * 5320 MHz [64] (30.0 dBm) (passive scanning, no IBSS, radar detection)
                         * 5500 MHz [100] (disabled)
                         * 5520 MHz [104] (disabled)
                         * 5540 MHz [108] (disabled)
                         * 5560 MHz [112] (disabled)
                         * 5580 MHz [116] (disabled)
                         * 5600 MHz [120] (disabled)
                         * 5620 MHz [124] (disabled)
                         * 5640 MHz [128] (disabled)
                         * 5660 MHz [132] (disabled)
                         * 5680 MHz [136] (disabled)
                         * 5700 MHz [140] (disabled)
                         * 5745 MHz [149] (30.0 dBm) (passive scanning, no IBSS)
                         * 5765 MHz [153] (30.0 dBm) (passive scanning, no IBSS)
                         * 5785 MHz [157] (30.0 dBm) (passive scanning, no IBSS)
                         * 5805 MHz [161] (30.0 dBm) (passive scanning, no IBSS)
                         * 5825 MHz [165] (30.0 dBm) (passive scanning, no IBSS)

ath9k_htc: Issue with channel 52 and above (DFS?)

[Michael Leun]

Hi,

with an intel based and an ath9k mini pci express card I see my 5GHz AP
in iwlist scan results regardless if it is on channels 36-48 or on 52
and above.

With this

Bus 002 Device 031: ID 0846:9018 NetGear, Inc. WNDA3200 802.11abgn Wireless Adapter [Atheros AR7010+AR9280]

ath9k_htc based card I see the same AP only if it operates on channel
36-48, I do NOT see it in iwlist scan results if it is on channel 52 to
140 - I again see it when it is on 149 or above.

So, exactly the channels which require radar detection seem to be
missing.

I wonder why this happens (if related to DFS) - radar detection needs
to happen on the AP, not the client, or do I overlook something?


-- 
MfG,

Michael Leun