Flint 2: worse Wi-Fi coverage on 4.8.4 compared to 4.8.3

imimimx · June 14, 2026, 6:24am

Likely further incorrect assumptions, I’m afraid.

Quote:

“Router has 3dBm antenna gain programmed in calibration data… it is lawful requirement to discount antenna gain and limit signal (cf 5GHz where radio power is limited in next line)”

Source:

github.com/openwrt/openwrt

MediaTek MT7603E: TX power significantly degraded in latest shapshots

opened 11:33AM - 08 Jan 24 UTC

closed 08:02AM - 04 Feb 24 UTC

csharper2005

target/ramips bug Official Image SNAPSHOT Supported Device

### Describe the bug MediaTek MT7603E TX power significantly degraded in latest… snapshots: 23.05.2: 22 dBm SNAPSHOT: 19 dBm ![image](https://github.com/openwrt/openwrt/assets/82600916/1986591c-498d-426d-af5b-a78fc794356b) ### OpenWrt version r24750-f1de1a090f ### OpenWrt release SNAPSHOT ### OpenWrt target/subtarget ramips/mt7621 ### Device Beeline SmartBox TURBO+ ### Image kind Official downloaded image ### Steps to reproduce 1. Install OpenWrt 23.05.2. Make sure that `iwinfo` shows normal TX power (20 dBm or more) for MediaTek MT7603E. 2. Install OpenWrt SNAPSHOT. Make sure that `iwinfo` shows low TX power (less than 20 dBm) for MediaTek MT7603E. ### Actual behaviour MediaTek MT7603E TX power (19 dBm) is below HW and regulatory restrictions. ### Expected behaviour MediaTek MT7603E TX power is 22 dBm (as well as in OpenWrt 23.05.2). ### Additional info ``` Wiphy phy0 wiphy index: 0 max # scan SSIDs: 4 max scan IEs length: 2257 bytes max # sched scan SSIDs: 0 max # match sets: 0 Retry short limit: 7 Retry long limit: 4 Coverage class: 0 (up to 0m) Device supports AP-side u-APSD. Device supports T-DLS. Available Antennas: TX 0x3 RX 0x3 Configured Antennas: TX 0x3 RX 0x3 Supported interface modes: * IBSS * managed * AP * AP/VLAN * monitor * mesh point * P2P-client * P2P-GO Band 1: Capabilities: 0x1fe HT20/HT40 SM Power Save disabled RX Greenfield RX HT20 SGI RX HT40 SGI TX STBC RX STBC 1-stream Max AMSDU length: 3839 bytes No DSSS/CCK HT40 Maximum RX AMPDU length 65535 bytes (exponent: 0x003) Minimum RX AMPDU time spacing: No restriction (0x00) HT TX/RX MCS rate indexes supported: 0-15 Frequencies: * 2412 MHz [1] (22.0 dBm) * 2417 MHz [2] (22.0 dBm) * 2422 MHz [3] (22.0 dBm) * 2427 MHz [4] (22.0 dBm) * 2432 MHz [5] (22.0 dBm) * 2437 MHz [6] (22.0 dBm) * 2442 MHz [7] (22.0 dBm) * 2447 MHz [8] (22.0 dBm) * 2452 MHz [9] (22.0 dBm) * 2457 MHz [10] (22.0 dBm) * 2462 MHz [11] (22.0 dBm) * 2467 MHz [12] (22.0 dBm) * 2472 MHz [13] (22.0 dBm) * 2484 MHz [14] (disabled) valid interface combinations: * #{ IBSS } <= 1, #{ managed, AP, mesh point, P2P-client, P2P-GO } <= 4, total <= 4, #channels <= 1, STA/AP BI must match HT Capability overrides: * MCS: ff ff ff ff ff ff ff ff ff ff * maximum A-MSDU length * supported channel width * short GI for 40 MHz * max A-MPDU length exponent * min MPDU start spacing max # scan plans: 1 max scan plan interval: -1 max scan plan iterations: 0 Supported extended features: * [ RRM ]: RRM * [ FILS_STA ]: STA FILS (Fast Initial Link Setup) * [ CQM_RSSI_LIST ]: multiple CQM_RSSI_THOLD records * [ CONTROL_PORT_OVER_NL80211 ]: control port over nl80211 * [ TXQS ]: FQ-CoDel-enabled intermediate TXQs * [ SCAN_RANDOM_SN ]: use random sequence numbers in scans * [ SCAN_MIN_PREQ_CONTENT ]: use probe request with only rate IEs in scans * [ AIRTIME_FAIRNESS ]: airtime fairness scheduling * [ AQL ]: Airtime Queue Limits (AQL) * [ CONTROL_PORT_NO_PREAUTH ]: disable pre-auth over nl80211 control port support * [ DEL_IBSS_STA ]: deletion of IBSS station support * [ SCAN_FREQ_KHZ ]: scan on kHz frequency support * [ CONTROL_PORT_OVER_NL80211_TX_STATUS ]: tx status for nl80211 control port support ``` ``` iwinfo phy0-ap0 ESSID: "OpenWrt-2g" Access Point: 14:xx:xx:xx:xx:xx Mode: Master Channel: 1 (2.412 GHz) HT Mode: HT20 Center Channel 1: 1 2: unknown Tx-Power: 19 dBm Link Quality: 49/70 Signal: -61 dBm Noise: unknown Bit Rate: 72.2 MBit/s Encryption: WPA3 SAE (CCMP) Type: nl80211 HW Mode(s): 802.11b/g/n Hardware: 14C3:7603 14C3:7603 [MediaTek MT7603E] TX power offset: none Frequency offset: none Supports VAPs: yes PHY name: phy0 ``` ``` iw reg get global country PA: DFS-FCC (2400 - 2483 @ 40), (N/A, 36), (N/A) (5150 - 5250 @ 80), (N/A, 36), (N/A), AUTO-BW (5250 - 5350 @ 80), (N/A, 30), (N/A), AUTO-BW (5470 - 5725 @ 160), (N/A, 30), (N/A) (5725 - 5850 @ 80), (N/A, 36), (N/A) (57000 - 64000 @ 2160), (N/A, 43), (N/A) ``` ### Diffconfig _No response_ ### Terms - [X] I am reporting an issue for OpenWrt, not an unsupported fork.

Total output, up to 23, yes.

But it also has to take into account antenna gain - so 20 is likely correct, 20+3.

Also discussed before in this thread.