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Fix RTL8822CE kernel panic on 5GHz AP with VHT

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Problem: RTL8822CE driver caused kernel panic (watchdog hard LOCKUP) when
hostapd tried to use VHT 802.11ac with 80MHz channel width on channel 149.

Root cause: Driver/firmware instability with VHT capabilities on this chip.

Solution: Disable VHT, use HT40+ (802.11n) only.
- Removes ieee80211ac (VHT), ieee80211ax (802.11ax), and 80MHz channel width
- Keeps HT40+ with Short GI for reasonable performance
- Stable operation on channel 149 (5745 MHz)

This allows the 5GHz AP to start and beacon without lockup on R5C hardware.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
This commit is contained in:
andreas
2026-09-18 18:27:23 -04:00
co-authored by Claude Haiku 4.5
parent 565e8f31ab
commit 2b00157642
1 changed files with 8 additions and 7 deletions
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ap/hostapd.conf
+8 -7
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@@ -17,13 +17,14 @@ channel=149
wmm_enabled=1 wmm_enabled=1
ieee80211n=1 ieee80211n=1
ht_capab=[HT40+][SHORT-GI-20][SHORT-GI-40] ht_capab=[HT40+][SHORT-GI-20][SHORT-GI-40]
ieee80211ac=1 # Disabled: VHT/80MHz causes RTL8822CE driver lockup on channel 149
vht_oper_chwidth=1 # ieee80211ac=1
vht_oper_centr_freq_seg0_idx=155 # vht_oper_chwidth=1
vht_capab=[RXLDPC][SHORT-GI-80][SU-BEAMFORMEE] # vht_oper_centr_freq_seg0_idx=155
ieee80211ax=1 # vht_capab=[RXLDPC][SHORT-GI-80][SU-BEAMFORMEE]
he_oper_chwidth=1 # ieee80211ax=1
he_oper_centr_freq_seg0_idx=155 # he_oper_chwidth=1
# he_oper_centr_freq_seg0_idx=155
auth_algs=1 auth_algs=1
wpa=2 wpa=2
wpa_passphrase=1foot11foot11 wpa_passphrase=1foot11foot11