immortalwrt-mt798x/package/kernel/mac80211/patches/subsys/600-mac80211-allow-vht-on-2g.patch

--- a/net/mac80211/vht.c
+++ b/net/mac80211/vht.c
@@ -135,7 +135,8 @@ ieee80211_vht_cap_ie_to_sta_vht_cap(stru
 	have_80mhz = false;
 	for (i = 0; i < sband->n_channels; i++) {
 		if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
-						IEEE80211_CHAN_NO_80MHZ))
+						IEEE80211_CHAN_NO_80MHZ) &
+						(sband->band != NL80211_BAND_2GHZ))
 			continue;
 
 		have_80mhz = true;
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1925,7 +1925,8 @@ static int ieee80211_build_preq_ies_band
 	/* Check if any channel in this sband supports at least 80 MHz */
 	for (i = 0; i < sband->n_channels; i++) {
 		if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
-						IEEE80211_CHAN_NO_80MHZ))
+						IEEE80211_CHAN_NO_80MHZ) &
+						(sband->band != NL80211_BAND_2GHZ))
 			continue;
 
 		have_80mhz = true;
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -5122,7 +5122,8 @@ static int ieee80211_prep_channel(struct
 	have_80mhz = false;
 	for (i = 0; i < sband->n_channels; i++) {
 		if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
-						IEEE80211_CHAN_NO_80MHZ))
+						IEEE80211_CHAN_NO_80MHZ) &
+						(sband->band != NL80211_BAND_2GHZ))
 			continue;
 
 		have_80mhz = true;