FS#3969 - Low RSSI on MikroTik RouterBOARD hAP ac² with OpenWRT 21.02 (RBD52G-5HacD2HnD-TC) - ipq40xx

[openwrt-bot]

erhtun:

Device : MikroTik RouterBOARD hAP ac² (RBD52G-5HacD2HnD-TC)
Software: OpenWrt 21.02
**Steps to reproduce **
I have been boot with initramfs image v21.02.0-rc3 (r16172-2aba3e9784). Everything is good except wireless performance. When I connect 5GHz wireless with my Iphone and Macbook Pro, RSSI is too low even at near the rooter. When I walk away the rooter connection is lost. Also When I want to connect 2GHz, connection is lost immediately.

Router Informations
ID: RBD52G-5HacD2HnD-TC
FCC ID: TV7RBD52-5ACD2ND
SN: ---/925/r2
MAC address: Starts with 74:4D:28
Type: INTL
Plug: EU

root@OpenWrt:~# cat /etc/config/wireless

config wifi-device 'radio0'
option type 'mac80211'
option channel '11'
option hwmode '11g'
option path 'platform/soc/a000000.wifi'
option htmode 'HT20'
option disabled '1'
option country 'TR'

config wifi-iface 'default_radio0'
option device 'radio0'
option network 'lan'
option mode 'ap'
option ssid 'OpenWrt'
option encryption 'none'

config wifi-device 'radio1'
option type 'mac80211'
option channel '36'
option hwmode '11a'
option path 'platform/soc/a800000.wifi'
option htmode 'VHT80'
option cell_density '0'
option country 'TR'

config wifi-iface 'default_radio1'
option device 'radio1'
option network 'lan'
option mode 'ap'
option ssid 'OpenWrt5g'
option encryption 'psk2'
option key 'password1234'


root@OpenWrt:~# iwinfo wlan1 assoclist
5E:32:48:9F:08:94 -99 dBm / -112 dBm (SNR 13) 130 ms ago
RX: 65.0 MBit/s, VHT-MCS 1, 80MHz, VHT-NSS 1 2590 Pkts.
TX: 351.0 MBit/s, VHT-MCS 4, 80MHz, VHT-NSS 2 3162 Pkts.
expected throughput: unknown

[openwrt-bot]

notr1ch:

I am also having this issue with a fresh 21.02 booted from initramfs, hAP AC2 purchased in May 2020. Looks like an issue with the calibration data? Scanning for my home network, I can't even pick up the 2.4 GHz from 5 meters away and the 5 GHz shows at -105dBm (usually -45dBm at this location on a cellphone). Wireless on both frequencies works fine when booted back to RouterOS.

root@OpenWrt:/sys/firmware/mikrotik/hard_config/wlan_data# ls -al
drwxr-xr-x 2 root root 0 Aug 31 22:20 .
drwxr-xr-x 3 root root 0 Jan 1 1970 ..
-r-------- 1 root root 0 Aug 31 22:20 data_0
-r-------- 1 root root 0 Aug 31 22:20 data_2

I have dumped a few hopefully useful files.

EDIT: I see 41b8671 was included in 21.02 so it seems new format caldata should already be supported, so I am not sure what's going on here.

[openwrt-bot]

notr1ch:

For OP and anyone else following, there's been some discussion and a hopeful fix over on the OpenWRT Github: #3037 (comment)