From 2b00157642c8d0a9af8163deb577cdb391866e6e Mon Sep 17 00:00:00 2001
From: Andreas Wrede <andreas@wrede.ca>
Date: Fri, 18 Sep 2026 18:27:23 -0400
Subject: [PATCH] Fix RTL8822CE kernel panic on 5GHz AP with VHT

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>
---
 ap/hostapd.conf | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/ap/hostapd.conf b/ap/hostapd.conf
index 99ffa78..d946b6d 100644
--- a/ap/hostapd.conf
+++ b/ap/hostapd.conf
@@ -17,13 +17,14 @@ channel=149
 wmm_enabled=1
 ieee80211n=1
 ht_capab=[HT40+][SHORT-GI-20][SHORT-GI-40]
-ieee80211ac=1
-vht_oper_chwidth=1
-vht_oper_centr_freq_seg0_idx=155
-vht_capab=[RXLDPC][SHORT-GI-80][SU-BEAMFORMEE]
-ieee80211ax=1
-he_oper_chwidth=1
-he_oper_centr_freq_seg0_idx=155
+# Disabled: VHT/80MHz causes RTL8822CE driver lockup on channel 149
+# ieee80211ac=1
+# vht_oper_chwidth=1
+# vht_oper_centr_freq_seg0_idx=155
+# vht_capab=[RXLDPC][SHORT-GI-80][SU-BEAMFORMEE]
+# ieee80211ax=1
+# he_oper_chwidth=1
+# he_oper_centr_freq_seg0_idx=155
 auth_algs=1
 wpa=2
 wpa_passphrase=1foot11foot11