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Wed, 18 Mar 2026 17:23:25 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <1e96af437fa24674b353ddb530b2d8e7@realtek.com> <792645eed36041f0b3df951f1b28a08a@realtek.com> <458ed80e39734ea99610050140bb31ce@realtek.com> <1bd495ffe57c47eb827eec084729afa2@realtek.com> In-Reply-To: From: LB F Date: Thu, 19 Mar 2026 02:22:49 +0200 X-Gm-Features: AaiRm52IrXU1qDXCnMGcr9BBuBs4M9KvDOWMJJk4HqPu9QV0ZekaxAFUx0FjqAA Message-ID: Subject: Re: [BUG] wifi: rtw88: Hard system freeze on RTL8821CE when power_save is enabled (LPS/ASPM conflict) To: Ping-Ke Shih Cc: "linux-wireless@vger.kernel.org" , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset="UTF-8" Hi Ping-Ke, I successfully collected the output with your diagnostic printk. Here is the exact log entry triggered when the warning fires: [ 180.424146] VHT NSS=0 pkt_stat->rate=0x65 rx_status->band=1 rx_status->rate_idx=0 [ 180.424157] WARNING: net/mac80211/rx.c:5491 at ieee80211_rx_list+0x177/0x1020 [mac80211] Looking at the rtw88 source code, this perfectly explains why `nss` is 0: 1. The hardware/firmware reports `pkt_stat->rate = 0x65` (101 in decimal). 2. `rtw_rx_fill_rx_status()` checks if `pkt_stat->rate >= DESC_RATEVHT1SS_MCS0` (which is `0x2c`). Since `0x65 >= 0x2c`, it correctly sets `rx_status->encoding = RX_ENC_VHT`. 3. It then calls `rtw_desc_to_mcsrate(pkt_stat->rate, &rx_status->rate_idx, &rx_status->nss)`. 4. Inside `rtw_desc_to_mcsrate()`, the value `0x65` falls completely outside any known bounds. The highest defined rate in `enum rtw_trx_desc_rate` is `DESC_RATEVHT4SS_MCS9` (`0x53`). The HT range (`DESC_RATEMCS0` to `DESC_RATEMCS31`) ends at `0x2b`. 5. Because `0x65` matches absolutely none of the `if/else` brackets in `rtw_desc_to_mcsrate()`, the function simply returns without mutating `mcs` and `nss`. 6. Since `rx_status` was initialized with `memset(rx_status, 0, ...)` at the beginning of the function, `rx_status->nss` remains `0`. So mac80211 complains because the rtw88 driver doesn't know what rate `0x65` means, leaves NSS at 0, but still flags it as a VHT packet. Any idea what `0x65` represents from the hardware's perspective? Is it a firmware bug or a proprietary control/management frame rate index? Looking forward to your thoughts! Best regards, Oleksandr