Fwd: keeping up to date, kernel 4 -> 5, cannot ACS anymore

[Jouni Malinen]

On Mon, Jan 25, 2021 at 12:10:17PM -0500, Sven F. wrote:
> # hostapd -d -B -i wlan0 /tmp/0_CUSTOM_0
> ACS: No available channels found
> wlan0: IEEE 802.11 Configured channel (0) or frequency (0) not found from\
> the channel list of the current mode (2) IEEE 802.11a
> wlan0: IEEE 802.11 Hardware does not support configured channel
> Could not select hw_mode and channel. (-3)

The driver used here does not support the configured channel.

> hw_mode=a
> channel=0

That is a request to use a channel on the 5 GHz band.

> but iw list is saying that :
> 
> * 5180 MHz [36] (disabled)
> * 5200 MHz [40] (disabled)
> * 5220 MHz [44] (disabled)
> * 5240 MHz [48] (disabled)
> * 5260 MHz [52] (disabled)
> * 5280 MHz [56] (disabled)
> * 5300 MHz [60] (disabled)
> * 5320 MHz [64] (disabled)
> * 5500 MHz [100] (20.0 dBm) (no IR, radar detection)
> * 5520 MHz [104] (20.0 dBm) (no IR, radar detection)
> * 5540 MHz [108] (20.0 dBm) (no IR, radar detection)
> * 5560 MHz [112] (20.0 dBm) (no IR, radar detection)
> * 5580 MHz [116] (20.0 dBm) (no IR, radar detection)
> * 5600 MHz [120] (20.0 dBm) (no IR, radar detection)
> * 5620 MHz [124] (20.0 dBm) (no IR, radar detection)
> * 5640 MHz [128] (20.0 dBm) (no IR, radar detection)
> * 5660 MHz [132] (20.0 dBm) (no IR, radar detection)
> * 5680 MHz [136] (20.0 dBm) (no IR, radar detection)
> * 5700 MHz [140] (20.0 dBm) (no IR, radar detection)
> * 5720 MHz [144] (20.0 dBm) (no IR, radar detection)
> * 5745 MHz [149] (20.0 dBm) (no IR)
> * 5765 MHz [153] (20.0 dBm) (no IR)
> * 5785 MHz [157] (20.0 dBm) (no IR)
> * 5805 MHz [161] (20.0 dBm) (no IR)
> * 5825 MHz [165] (20.0 dBm) (no IR)
> * 5845 MHz [169] (disabled)
> * 5865 MHz [173] (disabled)

But there is no available 5 GHz channel for AP mode functionality from
the driver.
 
-- 
Jouni Malinen                                            PGP id EFC895FA