I got some problem after upgrade kernel to 5.2 version (debian testing linux-image-5.2.0-2-amd64). 5Ghz client stopped to see AP. Some tests with 1metre distance between client-AP: 2.4Ghz -22dBm, for 5Ghz - 53dBm !, for longer distance (8m + walls) 2.4 - 61dBm, 5Ghz not visible. All works fine with kernel 4.19 and on windows 10, other devices also see AP without any problems with same distance. Client Device - Alfa AWUS051NH # lsmod |grep rt2 rt2800usb 28672 0 rt2x00usb 28672 1 rt2800usb rt2800lib 135168 1 rt2800usb rt2x00lib 69632 3 rt2800usb,rt2x00usb,rt2800lib mac80211 868352 3 rt2x00lib,rt2x00usb,rt2800lib cfg80211 819200 2 rt2x00lib,mac80211 crc_ccitt 16384 1 rt2800lib usbcore 299008 9 xhci_hcd,rt2800usb,usbhid,xpad,usblp,usb_storage,xhci_pci,uas,rt2x00usb # uname -a Linux pc 5.2.0-2-amd64 #1 SMP Debian 5.2.9-2 (2019-08-21) x86_64 GNU/Linux # modinfo rt2800usb filename: /lib/modules/5.2.0-2-amd64/kernel/drivers/net/wireless/ralink/rt2x00/rt2800usb.ko license: GPL firmware: rt2870.bin description: Ralink RT2800 USB Wireless LAN driver. version: 2.3.0 author: http://rt2x00.serialmonkey.com srcversion: 554185273066F7CCC831E83 ... # dmesg|grep "rt2\|ieee8" [ 8.750465] ieee80211 phy0: rt2x00_set_rt: Info - RT chipset 2872, rev 0202 detected [ 8.806271] ieee80211 phy0: rt2x00_set_rf: Info - RF chipset 0004 detected [ 8.822990] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht' [ 8.823491] usbcore: registered new interface driver rt2800usb [ 8.829996] rt2800usb 3-3:1.0 wlx00c0ca32d4ad: renamed from wlan0 [ 10.180340] ieee80211 phy0: rt2x00lib_request_firmware: Info - Loading firmware file 'rt2870.bin' [ 10.181479] rt2800usb 3-3:1.0: firmware: direct-loading firmware rt2870.bin [ 10.181485] ieee80211 phy0: rt2x00lib_request_firmware: Info - Firmware detected - version: 0.36 # lsusb Bus 003 Device 005: ID 148f:2770 Ralink Technology, Corp. RT2770 Wireless Adapter # iw reg get global country UA: DFS-ETSI (2400 - 2483 @ 40), (N/A, 20), (N/A), NO-OUTDOOR (5150 - 5250 @ 80), (N/A, 20), (N/A), NO-OUTDOOR, AUTO-BW (5250 - 5350 @ 80), (N/A, 20), (0 ms), NO-OUTDOOR, DFS, AUTO-BW (5490 - 5670 @ 160), (N/A, 20), (0 ms), DFS (5735 - 5835 @ 80), (N/A, 20), (N/A) (57000 - 66000 @ 2160), (N/A, 40), (N/A) resetting to 00 didn't help # iwlist wlx00c0ca32d4ad txpower wlx00c0ca32d4ad unknown transmit-power information. Current Tx-Power=20 dBm (100 mW) # iw list Wiphy phy0 max # scan SSIDs: 4 max scan IEs length: 2257 bytes max # sched scan SSIDs: 0 max # match sets: 0 max # scan plans: 1 max scan plan interval: -1 max scan plan iterations: 0 Retry short long limit: 2 Coverage class: 0 (up to 0m) Device supports RSN-IBSS. Supported Ciphers: * WEP40 (00-0f-ac:1) * WEP104 (00-0f-ac:5) * TKIP (00-0f-ac:2) * CCMP-128 (00-0f-ac:4) * CCMP-256 (00-0f-ac:10) * GCMP-128 (00-0f-ac:8) * GCMP-256 (00-0f-ac:9) Available Antennas: TX 0 RX 0 Supported interface modes: * IBSS * managed * AP * AP/VLAN * monitor * mesh point Band 1: Capabilities: 0x27e HT20/HT40 SM Power Save disabled RX Greenfield RX HT20 SGI RX HT40 SGI RX STBC 2-streams Max AMSDU length: 3839 bytes No DSSS/CCK HT40 Maximum RX AMPDU length 65535 bytes (exponent: 0x003) Minimum RX AMPDU time spacing: 2 usec (0x04) HT RX MCS rate indexes supported: 0-15, 32 TX unequal modulation not supported HT TX Max spatial streams: 1 HT TX MCS rate indexes supported may differ Bitrates (non-HT): * 1.0 Mbps * 2.0 Mbps (short preamble supported) * 5.5 Mbps (short preamble supported) * 11.0 Mbps (short preamble supported) * 6.0 Mbps * 9.0 Mbps * 12.0 Mbps * 18.0 Mbps * 24.0 Mbps * 36.0 Mbps * 48.0 Mbps * 54.0 Mbps Frequencies: * 2412 MHz [1] (20.0 dBm) * 2417 MHz [2] (20.0 dBm) * 2422 MHz [3] (20.0 dBm) * 2427 MHz [4] (20.0 dBm) * 2432 MHz [5] (20.0 dBm) * 2437 MHz [6] (20.0 dBm) * 2442 MHz [7] (20.0 dBm) * 2447 MHz [8] (20.0 dBm) * 2452 MHz [9] (20.0 dBm) * 2457 MHz [10] (20.0 dBm) * 2462 MHz [11] (20.0 dBm) * 2467 MHz [12] (20.0 dBm) * 2472 MHz [13] (20.0 dBm) * 2484 MHz [14] (disabled) Band 2: Capabilities: 0x27e HT20/HT40 SM Power Save disabled RX Greenfield RX HT20 SGI RX HT40 SGI RX STBC 2-streams Max AMSDU length: 3839 bytes No DSSS/CCK HT40 Maximum RX AMPDU length 65535 bytes (exponent: 0x003) Minimum RX AMPDU time spacing: 2 usec (0x04) HT RX MCS rate indexes supported: 0-15, 32 TX unequal modulation not supported HT TX Max spatial streams: 1 HT TX MCS rate indexes supported may differ Bitrates (non-HT): * 6.0 Mbps * 9.0 Mbps * 12.0 Mbps * 18.0 Mbps * 24.0 Mbps * 36.0 Mbps * 48.0 Mbps * 54.0 Mbps Frequencies: * 5180 MHz [36] (20.0 dBm) * 5190 MHz [38] (20.0 dBm) * 5200 MHz [40] (20.0 dBm) * 5220 MHz [44] (20.0 dBm) * 5230 MHz [46] (20.0 dBm) * 5240 MHz [48] (20.0 dBm) * 5260 MHz [52] (20.0 dBm) (radar detection) * 5270 MHz [54] (20.0 dBm) (radar detection) * 5280 MHz [56] (20.0 dBm) (radar detection) * 5300 MHz [60] (20.0 dBm) (radar detection) * 5310 MHz [62] (20.0 dBm) (radar detection) * 5320 MHz [64] (20.0 dBm) (radar detection) * 5500 MHz [100] (20.0 dBm) (radar detection) * 5510 MHz [102] (20.0 dBm) (radar detection) * 5520 MHz [104] (20.0 dBm) (radar detection) * 5540 MHz [108] (20.0 dBm) (radar detection) * 5550 MHz [110] (20.0 dBm) (radar detection) * 5560 MHz [112] (20.0 dBm) (radar detection) * 5580 MHz [116] (20.0 dBm) (radar detection) * 5590 MHz [118] (20.0 dBm) (radar detection) * 5600 MHz [120] (20.0 dBm) (radar detection) * 5620 MHz [124] (20.0 dBm) (radar detection) * 5630 MHz [126] (20.0 dBm) (radar detection) * 5640 MHz [128] (20.0 dBm) (radar detection) * 5660 MHz [132] (20.0 dBm) (radar detection) * 5670 MHz [134] (disabled) * 5680 MHz [136] (disabled) * 5700 MHz [140] (disabled) * 5745 MHz [149] (20.0 dBm) * 5755 MHz [151] (20.0 dBm) * 5765 MHz [153] (20.0 dBm) * 5785 MHz [157] (20.0 dBm) * 5795 MHz [159] (20.0 dBm) * 5805 MHz [161] (20.0 dBm) * 5825 MHz [165] (20.0 dBm) * 5835 MHz [167] (disabled) * 5845 MHz [169] (disabled) * 5855 MHz [171] (disabled) * 5865 MHz [173] (disabled) * 4920 MHz [184] (disabled) * 4940 MHz [188] (disabled) * 4960 MHz [192] (disabled) * 4980 MHz [196] (disabled) * 6040 MHz [208] (disabled) * 6060 MHz [212] (disabled) * 6080 MHz [216] (disabled) Supported commands: * new_interface * set_interface * new_key * start_ap * new_station * new_mpath * set_mesh_config * set_bss * authenticate * associate * deauthenticate * disassociate * join_ibss * join_mesh * set_tx_bitrate_mask * frame * frame_wait_cancel * set_wiphy_netns * set_channel * set_wds_peer * probe_client * set_noack_map * register_beacons * start_p2p_device * set_mcast_rate * connect * disconnect * set_qos_map * set_multicast_to_unicast Supported TX frame types: * IBSS: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0 * managed: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0 * AP: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0 * AP/VLAN: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0 * mesh point: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0 * P2P-client: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0 * P2P-GO: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0 * P2P-device: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70 0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0 Supported RX frame types: * IBSS: 0x40 0xb0 0xc0 0xd0 * managed: 0x40 0xd0 * AP: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0 * AP/VLAN: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0 * mesh point: 0xb0 0xc0 0xd0 * P2P-client: 0x40 0xd0 * P2P-GO: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0 * P2P-device: 0x40 0xd0 software interface modes (can always be added): * AP/VLAN * monitor valid interface combinations: * #{ AP, mesh point } <= 8, total <= 8, #channels <= 1 HT Capability overrides: * MCS: ff ff ff ff ff ff ff ff ff ff * maximum A-MSDU length * supported channel width * short GI for 40 MHz * max A-MPDU length exponent * min MPDU start spacing Device supports TX status socket option. Device supports HT-IBSS. Device supports SAE with AUTHENTICATE command Device supports low priority scan. Device supports scan flush. Device supports AP scan. Device supports per-vif TX power setting Driver supports full state transitions for AP/GO clients Driver supports a userspace MPM Device supports configuring vdev MAC-addr on create. Supported extended features: * [ RRM ]: RRM * [ FILS_STA ]: STA FILS (Fast Initial Link Setup) * [ CQM_RSSI_LIST ]: multiple CQM_RSSI_THOLD records * [ CONTROL_PORT_OVER_NL80211 ]: control port over nl80211
