Hi, I've been observing this issue for a couple of days. I added pr_err (before and after) to debug this to find the culprit who change the flags from 0x0001 to 0x80020. Please see below. I used Raspberry Pi 5 with kernel 6.6.51. I think the flags are actually changed: 1) to 0x80000 in cfg80211.handle_channel_single_rule, then 2) to 0x80020 in cfg80211.reg_process_ht_flags_channel. /* initial boot */ [ 3.114181] cfg80211: handle_channel_custom: before hw_value: 0x0c, orig_flags: 0x0000, flags: 0x0000 [ 3.123453] cfg80211: handle_channel_custom: after hw_value: 0x0c, orig_flags: 0x0000, flags: 0x80180 [ 3.132813] cfg80211: handle_channel_custom: before hw_value: 0x0d, orig_flags: 0x0000, flags: 0x0000 [ 3.142074] cfg80211: handle_channel_custom: after hw_value: 0x0d, orig_flags: 0x0000, flags: 0x80180 [ 3.151421] cfg80211: handle_channel_custom: before hw_value: 0x0e, orig_flags: 0x0000, flags: 0x0000 [ 3.160681] cfg80211: handle_channel_custom: after hw_value: 0x0e, orig_flags: 0x0000, flags: 0x801b0 [ 3.170030] cfg80211: handle_channel_custom: before hw_value: 0x22, orig_flags: 0x0000, flags: 0x0000 [ 3.179291] cfg80211: handle_channel_custom: after hw_value: 0x22, orig_flags: 0x0000, flags: 0x80000 [ 3.188638] cfg80211: handle_channel_custom: before hw_value: 0x24, orig_flags: 0x0000, flags: 0x0000 [ 3.197897] cfg80211: handle_channel_custom: after hw_value: 0x24, orig_flags: 0x0000, flags: 0x80000 [ 3.207245] cfg80211: handle_channel_custom: before hw_value: 0x26, orig_flags: 0x0000, flags: 0x0000 [ 3.216512] cfg80211: handle_channel_custom: after hw_value: 0x26, orig_flags: 0x0000, flags: 0x80000 [ 3.225955] cfg80211: handle_channel_single_rule: before hw_value: 0x22, orig_flags: 0x80000, flags: 0x80000 [ 3.235837] cfg80211: handle_channel_single_rule: after hw_value: 0x22, orig_flags: 0x80000, flags: 0x80000 [ 3.235841] cfg80211: handle_channel_single_rule: before hw_value: 0x24, orig_flags: 0x80000, flags: 0x80000 [ 3.235843] cfg80211: handle_channel_single_rule: after hw_value: 0x24, orig_flags: 0x80000, flags: 0x80000 [ 3.265464] cfg80211: handle_channel_single_rule: before hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 [ 3.275338] cfg80211: handle_channel_single_rule: after hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 [ 3.285218] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x0c, orig_flags: 0x80180, flags: 0x80181 [ 3.295270] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x0d, orig_flags: 0x80180, flags: 0x80181 [ 3.305318] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x0e, orig_flags: 0x801b0, flags: 0x801b1 [ 3.305320] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x22, orig_flags: 0x80000, flags: 0x80000 [ 3.305323] cfg80211: reg_process_ht_flags_channel: after hw_value: 0x22, orig_flags: 0x80000, flags: 0x80020 [ 3.335460] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x24, orig_flags: 0x80000, flags: 0x80000 [ 3.335462] cfg80211: reg_process_ht_flags_channel: after hw_value: 0x24, orig_flags: 0x80000, flags: 0x80020 [ 3.335463] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 [ 3.335465] cfg80211: reg_process_ht_flags_channel: after hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 [ 3.406614] brcmfmac: brcmf_construct_chaninfo: hw_value: 0x0c, orig_flags: 0x80180, flags: 0x0001 [ 3.415666] brcmfmac: brcmf_construct_chaninfo: hw_value: 0x0d, orig_flags: 0x80180, flags: 0x0001 [ 3.424668] brcmfmac: brcmf_construct_chaninfo: hw_value: 0x0e, orig_flags: 0x801b0, flags: 0x0001 [ 3.433669] brcmfmac: brcmf_construct_chaninfo: hw_value: 0x22, orig_flags: 0x80000, flags: 0x0001 [ 3.442668] brcmfmac: brcmf_construct_chaninfo: hw_value: 0x24, orig_flags: 0x80000, flags: 0x0120 [ 3.451667] brcmfmac: brcmf_construct_chaninfo: hw_value: 0x26, orig_flags: 0x80000, flags: 0x0001 [ 3.464673] brcmfmac: brcmf_setup_wiphybands: hw_value: 0x0c, orig_flags: 0x80180, flags: 0x0001 [ 3.473504] brcmfmac: brcmf_setup_wiphybands: hw_value: 0x0d, orig_flags: 0x80180, flags: 0x0001 [ 3.482336] brcmfmac: brcmf_setup_wiphybands: hw_value: 0x0e, orig_flags: 0x801b0, flags: 0x0001 [ 3.491162] brcmfmac: brcmf_setup_wiphybands: hw_value: 0x22, orig_flags: 0x80000, flags: 0x0001 [ 3.499988] brcmfmac: brcmf_setup_wiphybands: hw_value: 0x24, orig_flags: 0x80000, flags: 0x0120 [ 3.508812] brcmfmac: brcmf_setup_wiphybands: hw_value: 0x26, orig_flags: 0x80000, flags: 0x0001 /* wpa_supplicant connect, the flags are changed here */ [ 10.493324] cfg80211: handle_channel_single_rule: before hw_value: 0x22, orig_flags: 0x80000, flags: 0x0001 [ 10.503174] cfg80211: handle_channel_single_rule: after hw_value: 0x22, orig_flags: 0x80000, flags: 0x80000 [ 10.513094] cfg80211: handle_channel_single_rule: before hw_value: 0x24, orig_flags: 0x80000, flags: 0x0120 [ 10.522898] cfg80211: handle_channel_single_rule: after hw_value: 0x24, orig_flags: 0x80000, flags: 0x80000 [ 10.532785] cfg80211: handle_channel_single_rule: before hw_value: 0x26, orig_flags: 0x80000, flags: 0x0001 [ 10.542601] cfg80211: handle_channel_single_rule: after hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 [ 10.552496] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x0c, orig_flags: 0x80180, flags: 0x0001 [ 10.562479] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x0d, orig_flags: 0x80180, flags: 0x0001 [ 10.572453] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x0e, orig_flags: 0x801b0, flags: 0x0001 [ 10.582438] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x22, orig_flags: 0x80000, flags: 0x80000 [ 10.592498] cfg80211: reg_process_ht_flags_channel: after hw_value: 0x22, orig_flags: 0x80000, flags: 0x80020 [ 10.602557] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x24, orig_flags: 0x80000, flags: 0x80000 [ 10.612624] cfg80211: reg_process_ht_flags_channel: after hw_value: 0x24, orig_flags: 0x80000, flags: 0x80020 [ 10.622683] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 [ 10.632740] cfg80211: reg_process_ht_flags_channel: after hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 /* wpa_supplicant disconnect */ [ 78.902910] cfg80211: handle_channel_single_rule: before hw_value: 0x22, orig_flags: 0x80000, flags: 0x80000 [ 78.912850] cfg80211: handle_channel_single_rule: after hw_value: 0x22, orig_flags: 0x80000, flags: 0x80000 [ 78.922781] cfg80211: handle_channel_single_rule: before hw_value: 0x24, orig_flags: 0x80000, flags: 0x80000 [ 78.932705] cfg80211: handle_channel_single_rule: after hw_value: 0x24, orig_flags: 0x80000, flags: 0x80000 [ 78.942623] cfg80211: handle_channel_single_rule: before hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 [ 78.952518] cfg80211: handle_channel_single_rule: after hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 [ 78.962433] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x0c, orig_flags: 0x80180, flags: 0x80181 [ 78.972500] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x0d, orig_flags: 0x80180, flags: 0x80181 [ 78.982563] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x0e, orig_flags: 0x801b0, flags: 0x801b1 [ 78.992623] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x22, orig_flags: 0x80000, flags: 0x80000 [ 79.002694] cfg80211: reg_process_ht_flags_channel: after hw_value: 0x22, orig_flags: 0x80000, flags: 0x80020 [ 79.012765] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x24, orig_flags: 0x80000, flags: 0x80000 [ 79.022835] cfg80211: reg_process_ht_flags_channel: after hw_value: 0x24, orig_flags: 0x80000, flags: 0x80020 [ 79.032891] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 [ 79.042969] cfg80211: reg_process_ht_flags_channel: after hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 /* wpa_supplicant re-connect */ [ 156.971916] brcmfmac: brcmf_set_channel: set chanspec 0xd022 fail, reason -52 [ 157.087904] brcmfmac: brcmf_set_channel: set chanspec 0xd026 fail, reason -52 [ 157.199928] brcmfmac: brcmf_set_channel: set chanspec 0xd02a fail, reason -52 [ 157.310944] brcmfmac: brcmf_set_channel: set chanspec 0xd02e fail, reason -52 [ 159.774209] cfg80211: handle_channel_single_rule: before hw_value: 0x22, orig_flags: 0x80000, flags: 0x80020 [ 159.784166] cfg80211: handle_channel_single_rule: after hw_value: 0x22, orig_flags: 0x80000, flags: 0x80000 [ 159.794073] cfg80211: handle_channel_single_rule: before hw_value: 0x24, orig_flags: 0x80000, flags: 0x80020 [ 159.803977] cfg80211: handle_channel_single_rule: after hw_value: 0x24, orig_flags: 0x80000, flags: 0x80000 [ 159.813887] cfg80211: handle_channel_single_rule: before hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 [ 159.823792] cfg80211: handle_channel_single_rule: after hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 [ 159.833689] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x0c, orig_flags: 0x80180, flags: 0x801b1 [ 159.843751] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x0d, orig_flags: 0x80180, flags: 0x801b1 [ 159.853814] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x0e, orig_flags: 0x801b0, flags: 0x801b1 [ 159.863889] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x22, orig_flags: 0x80000, flags: 0x80000 [ 159.873958] cfg80211: reg_process_ht_flags_channel: after hw_value: 0x22, orig_flags: 0x80000, flags: 0x80020 [ 159.884038] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x24, orig_flags: 0x80000, flags: 0x80000 [ 159.894100] cfg80211: reg_process_ht_flags_channel: after hw_value: 0x24, orig_flags: 0x80000, flags: 0x80020 [ 159.904187] cfg80211: reg_process_ht_flags_channel: before hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 [ 159.914248] cfg80211: reg_process_ht_flags_channel: after hw_value: 0x26, orig_flags: 0x80000, flags: 0x80000 Is there any workaround for this or is this behavior expected? Regards. Renjaya
