Intel 7265NGW dissapears after switching mode to AP

[dot1q]

Hi everyone!
I have a board Mikrotik 33G with installed openwrt on it.

root@OpenWrt:/# uname -a
Linux OpenWrt 4.14.82 #0 SMP Sun Jan 19 12:50:14 2020 mips GNU/Linux

All required modules are enabled: iwlwifi, mac80211, cfg80211 etc. The device is available for scanning SSID's but after switching it to Master mode it disappears. I use this wireless config:

config wifi-device 'radio0'
        option type 'mac80211'
        option channel '5'
        option hwmode '11a'
        option path 'pci0000:00/0000:00:00.0/0000:01:00.0'
        option disabled '0'

config wifi-iface 'default_radio0'
        option device 'radio0'
        option network 'wwan'
        option mode 'ap'
        option ssid 'Hydra'
        option encryption 'none'

An option path is correct. It was obtained from a wifi config command. After running 'wifi up' command device disappears from ip link list without any logs in the dmesg.
Can anyone help me?

[juppin]

Almost no intel wifi chip does support ap mode.
Check the out put of iw list to determine the supported operation modes.

[dot1q]

Thank you for reply
Yes, I already checked this point:

        Supported interface modes:
                 * IBSS
                 * managed
                 * AP
                 * AP/VLAN
                 * monitor
                 * P2P-client
                 * P2P-GO
                 * P2P-device

[dot1q]

I already had the same problem with different device here but that problem was related to redundant option in config. Now this solution doesn't help me

[juppin]

What about system and kernel logs?
There aren't any hints for the failure?

[dot1q]

No, there aren't any new logs in dmesg

[dot1q]

There are some lines with an error after boot:

root@OpenWrt:/# dmesg | grep iwl
[   27.118325] iwlwifi 0000:01:00.0: assign IRQ: got 25
[   27.123649] iwlwifi 0000:01:00.0: pci_enable_msi failed - -89  <-- this line
[   27.151596] iwlwifi 0000:01:00.0: loaded firmware version 29.1044073957.0 op_mode iwlmvm
[   27.207221] iwlwifi 0000:01:00.0: Detected Intel(R) Dual Band Wireless AC 7265, REV=0x210
[   27.275523] iwlwifi 0000:01:00.0: base HW address: 3c:6a:a7:fa:fd:fc
[   27.355742] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'

[dot1q]

@slh maybe you can help me again?

[slh]

@dot1q

	option channel '5' 
	option hwmode '11a'

does not match, channel 5 is a 2.4 GHz channel while you tell the driver to use the 5 GHz band (option hwmode '11g' would be needed here). No Intel driver at all supports AP mode in the 5 GHz band, so you're restricted to using the 2.4 GHz band (but again, Intel wireless hardware isn't made for running in AP mode - and that might show).

Disclaimer: I don't own any 7265ngw (or similar Intel-) card and can't help beyond this.

[dot1q]

Thank you for reply
Yes, I've tried to use 2.4GHz and 5GHz frequencies and I've got the same result

[juppin]

And what about the system logs?

Command: logread

[dot1q]

Yes, logs were disabled. After enabling logread I found out that there isn't hostapd in the image. Thank you, @juppin, I've looked only in dmesg.