Hello, I'm Francesco Vigolo, we have a project with some WiFi cards using ar9220 chipset (minipci). We have implemented these cards into a Linux embedded system. We are using Openwrt linux 4.4.0 Kernel and ath9k driver (backports-20151218). We are implementing an ITS-G5 system. Seems that cards are not working correctly higher than 8595 MHz (ch 179), while 5895 and lower channels are working. If I set 5900 (180) or 5905 (181) or another ch like 5915 (183) MHz the driver stop working. We have patched drivers to allow these channels from the perspective of regulatory and to allow this band (commonn-init.c, hw.h, regd.c, db.txt). Could you please indicate us a linux driver version working for sure with ar9220 chipset @ higher freq than 5895? Hardware for sure is working. In attachment a log indicating the problem with the driver.Let me know if you need more informations. Here *iw reg get *and *iw list *showing that regulatory has been patched correctly... ########################## root@OpenWrt:/# iw reg get country US: DFS-UNSET (2402 - 2472 @ 40), (N/A, 30), (N/A) (5000 - 6000 @ 160), (N/A, 30), (N/A) (57240 - 63720 @ 2160), (N/A, 40), (N/A) ########################################## root@OpenWrt:/# iw list Wiphy phy1 max # scan SSIDs: 4 max scan IEs length: 2261 bytes Retry short limit: 7 Retry long limit: 4 Coverage class: 0 (up to 0m) Device supports AP-side u-APSD. Device supports T-DLS. Available Antennas: TX 0x3 RX 0x3 Configured Antennas: TX 0x3 RX 0x3 Supported interface modes: * IBSS * managed * AP * AP/VLAN * WDS * monitor * mesh point * P2P-client * P2P-GO Band 2: Capabilities: 0x11ce HT20/HT40 SM Power Save disabled RX HT40 SGI TX STBC RX STBC 1-stream Max AMSDU length: 3839 bytes DSSS/CCK HT40 Maximum RX AMPDU length 65535 bytes (exponent: 0x003) Minimum RX AMPDU time spacing: 8 usec (0x06) HT TX/RX MCS rate indexes supported: 0-15 Frequencies: * 5180 MHz [36] (13.0 dBm) * 5200 MHz [40] (19.0 dBm) * 5220 MHz [44] (19.0 dBm) * 5240 MHz [48] (19.0 dBm) * 5260 MHz [52] (19.0 dBm) * 5280 MHz [56] (19.0 dBm) * 5300 MHz [60] (19.0 dBm) * 5320 MHz [64] (20.0 dBm) * 5500 MHz [100] (20.0 dBm) * 5520 MHz [104] (20.0 dBm) * 5540 MHz [108] (20.0 dBm) * 5560 MHz [112] (20.0 dBm) * 5580 MHz [116] (20.0 dBm) * 5600 MHz [120] (20.0 dBm) * 5620 MHz [124] (20.0 dBm) * 5640 MHz [128] (20.0 dBm) * 5660 MHz [132] (20.0 dBm) * 5680 MHz [136] (20.0 dBm) * 5700 MHz [140] (20.0 dBm) * 5745 MHz [149] (20.0 dBm) * 5765 MHz [153] (20.0 dBm) * 5785 MHz [157] (20.0 dBm) * 5805 MHz [161] (20.0 dBm) * 5825 MHz [165] (20.0 dBm) * 5855 MHz [171] (23.0 dBm) * 5860 MHz [172] (23.0 dBm) * 5865 MHz [173] (23.0 dBm) * 5870 MHz [174] (23.0 dBm) * 5875 MHz [175] (23.0 dBm) * 5880 MHz [176] (23.0 dBm) * 5885 MHz [177] (23.0 dBm) * 5890 MHz [178] (23.0 dBm) * 5895 MHz [179] (23.0 dBm) * 5900 MHz [180] (23.0 dBm) * 5905 MHz [181] (23.0 dBm) * 5910 MHz [182] (23.0 dBm) * 5915 MHz [183] (23.0 dBm) * 5920 MHz [184] (23.0 dBm) * 5925 MHz [185] (23.0 dBm) * 5040 MHz [8] (23.0 dBm) * 5060 MHz [12] (23.0 dBm) * 5080 MHz [16] (23.0 dBm) * 5100 MHz [20] (23.0 dBm) * 5120 MHz [24] (23.0 dBm) * 5140 MHz [28] (23.0 dBm) * 5160 MHz [32] (23.0 dBm) valid interface combinations: * #{ managed, WDS } <= 2048, #{ AP, mesh point } <= 8, #{ P2P-client, P2P-GO } <= 1, #{ IBSS } <= 1, total <= 2048, #channels <= 1, STA/AP BI must match * #{ IBSS, AP, mesh point } <= 1, total <= 1, #channels <= 1, STA/AP BI must match, radar detect widths: { 20 MHz (no HT), 20 MHz } 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 Wiphy phy0 max # scan SSIDs: 4 max scan IEs length: 2257 bytes Retry short limit: 7 Retry long limit: 4 Coverage class: 0 (up to 0m) Device supports AP-side u-APSD. Device supports T-DLS. Available Antennas: TX 0x3 RX 0x3 Configured Antennas: TX 0x3 RX 0x3 Supported interface modes: * IBSS * managed * AP * AP/VLAN * WDS * monitor * mesh point * P2P-client * P2P-GO Band 1: Capabilities: 0x11ce HT20/HT40 SM Power Save disabled RX HT40 SGI TX STBC RX STBC 1-stream Max AMSDU length: 3839 bytes DSSS/CCK HT40 Maximum RX AMPDU length 65535 bytes (exponent: 0x003) Minimum RX AMPDU time spacing: 8 usec (0x06) HT TX/RX MCS rate indexes supported: 0-15 Frequencies: * 2412 MHz [1] (20.0 dBm) * 2417 MHz [2] (23.0 dBm) * 2422 MHz [3] (23.0 dBm) * 2427 MHz [4] (23.0 dBm) * 2432 MHz [5] (23.0 dBm) * 2437 MHz [6] (23.0 dBm) * 2442 MHz [7] (23.0 dBm) * 2447 MHz [8] (23.0 dBm) * 2452 MHz [9] (23.0 dBm) * 2457 MHz [10] (23.0 dBm) * 2462 MHz [11] (20.0 dBm) * 2467 MHz [12] (disabled) * 2472 MHz [13] (disabled) * 2484 MHz [14] (disabled) Band 2: Capabilities: 0x11ce HT20/HT40 SM Power Save disabled RX HT40 SGI TX STBC RX STBC 1-stream Max AMSDU length: 3839 bytes DSSS/CCK HT40 Maximum RX AMPDU length 65535 bytes (exponent: 0x003) Minimum RX AMPDU time spacing: 8 usec (0x06) HT TX/RX MCS rate indexes supported: 0-15 Frequencies: * 5180 MHz [36] (16.0 dBm) * 5200 MHz [40] (16.0 dBm) * 5220 MHz [44] (16.0 dBm) * 5240 MHz [48] (16.0 dBm) * 5260 MHz [52] (16.0 dBm) * 5280 MHz [56] (16.0 dBm) * 5300 MHz [60] (16.0 dBm) * 5320 MHz [64] (18.0 dBm) * 5500 MHz [100] (14.0 dBm) * 5520 MHz [104] (21.0 dBm) * 5540 MHz [108] (21.0 dBm) * 5560 MHz [112] (21.0 dBm) * 5580 MHz [116] (21.0 dBm) * 5600 MHz [120] (21.0 dBm) * 5620 MHz [124] (21.0 dBm) * 5640 MHz [128] (21.0 dBm) * 5660 MHz [132] (21.0 dBm) * 5680 MHz [136] (21.0 dBm) * 5700 MHz [140] (14.0 dBm) * 5745 MHz [149] (21.0 dBm) * 5765 MHz [153] (21.0 dBm) * 5785 MHz [157] (21.0 dBm) * 5805 MHz [161] (21.0 dBm) * 5825 MHz [165] (21.0 dBm) * 5855 MHz [171] (21.0 dBm) * 5860 MHz [172] (21.0 dBm) * 5865 MHz [173] (21.0 dBm) * 5870 MHz [174] (21.0 dBm) * 5875 MHz [175] (21.0 dBm) * 5880 MHz [176] (21.0 dBm) * 5885 MHz [177] (21.0 dBm) * 5890 MHz [178] (21.0 dBm) * 5895 MHz [179] (21.0 dBm) * 5900 MHz [180] (21.0 dBm) * 5905 MHz [181] (21.0 dBm) * 5910 MHz [182] (21.0 dBm) * 5915 MHz [183] (21.0 dBm) * 5920 MHz [184] (21.0 dBm) * 5925 MHz [185] (21.0 dBm) * 5040 MHz [8] (21.0 dBm) * 5060 MHz [12] (21.0 dBm) * 5080 MHz [16] (21.0 dBm) * 5100 MHz [20] (21.0 dBm) * 5120 MHz [24] (21.0 dBm) * 5140 MHz [28] (21.0 dBm) * 5160 MHz [32] (21.0 dBm) valid interface combinations: * #{ managed, WDS } <= 2048, #{ AP, mesh point } <= 8, #{ P2P-client, P2P-GO } <= 1, #{ IBSS } <= 1, total <= 2048, #channels <= 1, STA/AP BI must match * #{ IBSS, AP, mesh point } <= 1, total <= 1, #channels <= 1, STA/AP BI must match, radar detect widths: { 20 MHz (no HT), 20 MHz } 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 ######################################## Let me know. thank you very much