hi. I am trying to capture on 2 channels at the same time with 2 cards. One card is TP-Link TL-W722N v1 using ath9k_htc and the second one is an Alfa AWUS051NH v2 using rt2800usb. I have tried this, first, on raspberry pi 0 W using archlinux-arm and reproduced the issue on a netbook using archlinux x64 too using latest kernel and drivers. (seems to happen on ubuntu 17.10 on dell laptop too) So when the Alfa card is used alone using the default reg dom FR, one can change to 112 channel for example (using iw dev wlan1 set channel 112) But once the tp-link is plugged in, reg dom seems to become CN and one can't change the alfa card to 112 channel. iw reg get output change from global country FR: DFS-ETSI (2402 - 2482 @ 40), (N/A, 20), (N/A) (5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW (5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW (5490 - 5710 @ 160), (N/A, 27), (0 ms), DFS (57000 - 66000 @ 2160), (N/A, 40), (N/A) to global country 98: DFS-UNSET (2402 - 2482 @ 40), (N/A, 20), (N/A) (5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW (5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW (57240 - 59400 @ 2160), (N/A, 28), (N/A) (59400 - 63720 @ 2160), (N/A, 40), (N/A) (63720 - 65880 @ 2160), (N/A, 28), (N/A) phy#2 country CN: DFS-FCC (2402 - 2482 @ 40), (N/A, 20), (N/A) (5170 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW (5250 - 5330 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW (5735 - 5835 @ 80), (N/A, 30), (N/A) (57240 - 59400 @ 2160), (N/A, 28), (N/A) (59400 - 63720 @ 2160), (N/A, 44), (N/A) (63720 - 65880 @ 2160), (N/A, 28), (N/A) and all the channels above 100 are marked as disabled in iw list output (after the plug not before) for the alfa card It is as if the TL-WN722N has CN reg dom hard-coded and that switches it globally to CN too ??? Is this a bug in ath9k_htc ? a bug with the TL-WN722N card ??
