Hello, Im using openwrt 21.02.1 on WE2426-C (MT7628A + MT7612E). 2ghz is ok but 5ghz (MT7612E) is stuck in 3dbm max tx power. See:
Wiphy phy1
max # scan SSIDs: 4
max scan IEs length: 2243 bytes
max # sched scan SSIDs: 0
max # match sets: 0
max # scan plans: 1
max scan plan interval: -1
max scan plan iterations: 0
Retry short limit: 7
Retry long limit: 4
Coverage class: 0 (up to 0m)
Available Antennas: TX 0x3 RX 0x3
Configured Antennas: TX 0x3 RX 0x3
Supported interface modes:
* IBSS
* managed
* AP
* AP/VLAN
* monitor
* mesh point
Band 1:
Capabilities: 0x1ff
RX LDPC
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: 4 usec (0x05)
HT TX/RX MCS rate indexes supported: 0-15
Frequencies:
* 2412 MHz [1] (3.0 dBm)
* 2417 MHz [2] (3.0 dBm)
* 2422 MHz [3] (3.0 dBm)
* 2427 MHz [4] (3.0 dBm)
* 2432 MHz [5] (3.0 dBm)
* 2437 MHz [6] (3.0 dBm)
* 2442 MHz [7] (3.0 dBm)
* 2447 MHz [8] (3.0 dBm)
* 2452 MHz [9] (3.0 dBm)
* 2457 MHz [10] (3.0 dBm)
* 2462 MHz [11] (3.0 dBm)
* 2467 MHz [12] (3.0 dBm) (no IR)
* 2472 MHz [13] (3.0 dBm) (no IR)
* 2484 MHz [14] (3.0 dBm) (no IR)
Band 2:
Capabilities: 0x1ff
RX LDPC
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: 4 usec (0x05)
HT TX/RX MCS rate indexes supported: 0-15
VHT Capabilities (0x018001b0):
Max MPDU length: 3895
Supported Channel Width: neither 160 nor 80+80
RX LDPC
short GI (80 MHz)
TX STBC
VHT RX MCS set:
1 streams: MCS 0-9
2 streams: MCS 0-9
3 streams: not supported
4 streams: not supported
5 streams: not supported
6 streams: not supported
7 streams: not supported
8 streams: not supported
VHT RX highest supported: 0 Mbps
VHT TX MCS set:
1 streams: MCS 0-9
2 streams: MCS 0-9
3 streams: not supported
4 streams: not supported
5 streams: not supported
6 streams: not supported
7 streams: not supported
8 streams: not supported
VHT TX highest supported: 0 Mbps
Frequencies:
* 5180 MHz [36] (3.0 dBm)
* 5200 MHz [40] (3.0 dBm)
* 5220 MHz [44] (3.0 dBm)
* 5240 MHz [48] (3.0 dBm)
* 5260 MHz [52] (3.0 dBm) (no IR, radar detection)
* 5280 MHz [56] (3.0 dBm) (no IR, radar detection)
* 5300 MHz [60] (3.0 dBm) (no IR, radar detection)
* 5320 MHz [64] (3.0 dBm) (no IR, radar detection)
* 5500 MHz [100] (3.0 dBm) (no IR, radar detection)
* 5520 MHz [104] (3.0 dBm) (no IR, radar detection)
* 5540 MHz [108] (3.0 dBm) (no IR, radar detection)
* 5560 MHz [112] (3.0 dBm) (no IR, radar detection)
* 5580 MHz [116] (3.0 dBm) (no IR, radar detection)
* 5600 MHz [120] (3.0 dBm) (no IR, radar detection)
* 5620 MHz [124] (3.0 dBm) (no IR, radar detection)
* 5640 MHz [128] (3.0 dBm) (no IR, radar detection)
* 5660 MHz [132] (3.0 dBm) (no IR, radar detection)
* 5680 MHz [136] (3.0 dBm) (no IR, radar detection)
* 5700 MHz [140] (3.0 dBm) (no IR, radar detection)
* 5745 MHz [149] (3.0 dBm) (no IR)
* 5765 MHz [153] (3.0 dBm) (no IR)
* 5785 MHz [157] (3.0 dBm) (no IR)
* 5805 MHz [161] (3.0 dBm)
* 5825 MHz [165] (3.0 dBm) (no IR)
valid interface combinations:
* #{ IBSS } <= 1, #{ managed, AP, mesh point } <= 8,
total <= 8, #channels <= 1, STA/AP BI must match, radar detect widths: { 20 MHz (no HT), 20 MHz, 40 MHz, 80 MHz }
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
Device supports VHT-IBSS.
Run cat /etc/config/wireless and post the results.
Redact passwords in the "option key" sections.
dsouza
December 18, 2021, 11:13am
3
This is likely to be a known mt76 driver issue that hasn't been solved yet which affects multiple devices. See more details below:
opened 11:35AM - 05 Dec 21 UTC
Just looking at the bug reports here and in the OpenWRT defects repository, it i… s clear that for various mt76 chipsets the TX power is simply not working.
I myself am experimenting two issues with OpenWRT and mt76 drivers:
- With mt7613 on an TP-Link Archer C6 v3 with OpenWRT where TX power is set to maximum and cannot be changed (details in the OpenWRT bug [FS#181](https://bugs.openwrt.org/index.php?do=details&task_id=181)).
- With mt7610 on an TP-Link RE200 v2 with OpenWRT TX power is too low (max 9dBm), cannot be changed above this and makes the 5Ghz radio unusable.
Searching here in the mt76 repository about similar TX power issues, I've found multiple similar reports:
[TP-LINK RE200 problem with the operation of the WLAN chipset. OpenWRT rel 21.02rc4 #606](https://github.com/openwrt/mt76/issues/606)
[MT7610E: TX-Power Values incorrect -> low range #604](https://github.com/openwrt/mt76/issues/604)
[MT76x0: Correct VHT MCS 8/9 tx power eeprom offset #577](https://github.com/openwrt/mt76/issues/577)
[MT7615dn: 5G max power is 6dBm #574](https://github.com/openwrt/mt76/issues/574)
[Xiaomi r3p mt7615N low tx power 2ghz 5ghz #539](https://github.com/openwrt/mt76/issues/539)
[Low transmission power on MT7610EN #530](https://github.com/openwrt/mt76/issues/530)
[mt7603e max tx power is only 8 dBm on HiWiFi HC5962 #525](https://github.com/openwrt/mt76/issues/525)
[low tx power with mt76x0e driver #484](https://github.com/openwrt/mt76/issues/484)
[Low-incorrect txpower on Mediatek 7628 (TP-Link 840 ver 6.0) #279](https://github.com/openwrt/mt76/issues/279)
[Various issues with 5Ghz MT7610E #227](https://github.com/openwrt/mt76/issues/227)
[low tx power m7610e #216](https://github.com/openwrt/mt76/issues/216)
And some other more.
While as in the TP-Link Archer C6 v3 (mt7613) where TX Power is stuck at maximum allows it to be perfectly usable, on other devices such as TP-Link RE200 v2 (mt7610) wifi is unusable due to the very weak 5Ghz signal power.
So instead of opening more bug reports here for my TX Power issues with mt7613 and mt7610, I've decided summarize the existing bug reports about TX power here so perhaps we can concentrate the developers' focus on this single bug report.
Hello, yes a existent problem on MT76 driver. see the working(closed source patches?) stock driver:
Wiphy phy1
max # scan SSIDs: 4
max scan IEs length: 2247 bytes
max # sched scan SSIDs: 0
max # match sets: 0
max # scan plans: 1
max scan plan interval: -1
max scan plan iterations: 0
Retry short limit: 7
Retry long limit: 4
Coverage class: 0 (up to 0m)
Available Antennas: TX 0x3 RX 0x3
Configured Antennas: TX 0x3 RX 0x3
Supported interface modes:
* IBSS
* managed
* AP
* AP/VLAN
* monitor
* mesh point
Band 2:
Capabilities: 0x1ff
RX LDPC
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: 4 usec (0x05)
HT TX/RX MCS rate indexes supported: 0-15
VHT Capabilities (0x318001b0):
Max MPDU length: 3895
Supported Channel Width: neither 160 nor 80+80
RX LDPC
short GI (80 MHz)
TX STBC
RX antenna pattern consistency
TX antenna pattern consistency
VHT RX MCS set:
1 streams: MCS 0-9
2 streams: MCS 0-9
3 streams: not supported
4 streams: not supported
5 streams: not supported
6 streams: not supported
7 streams: not supported
8 streams: not supported
VHT RX highest supported: 0 Mbps
VHT TX MCS set:
1 streams: MCS 0-9
2 streams: MCS 0-9
3 streams: not supported
4 streams: not supported
5 streams: not supported
6 streams: not supported
7 streams: not supported
8 streams: not supported
VHT TX highest supported: 0 Mbps
Frequencies:
* 5180 MHz [36] (18.0 dBm)
* 5200 MHz [40] (18.0 dBm)
* 5220 MHz [44] (18.0 dBm)
* 5240 MHz [48] (18.0 dBm)
* 5260 MHz [52] (17.0 dBm) (no IR, radar detection)
* 5280 MHz [56] (17.0 dBm) (no IR, radar detection)
* 5300 MHz [60] (17.0 dBm) (no IR, radar detection)
* 5320 MHz [64] (17.0 dBm) (no IR, radar detection)
* 5500 MHz [100] (17.0 dBm) (no IR, radar detection)
* 5520 MHz [104] (17.0 dBm) (no IR, radar detection)
* 5540 MHz [108] (17.0 dBm) (no IR, radar detection)
* 5560 MHz [112] (17.0 dBm) (no IR, radar detection)
* 5580 MHz [116] (18.0 dBm) (no IR, radar detection)
* 5600 MHz [120] (18.0 dBm) (no IR, radar detection)
* 5620 MHz [124] (18.0 dBm) (no IR, radar detection)
* 5640 MHz [128] (18.0 dBm) (no IR, radar detection)
* 5660 MHz [132] (18.0 dBm) (no IR, radar detection)
* 5680 MHz [136] (18.0 dBm) (no IR, radar detection)
* 5700 MHz [140] (18.0 dBm) (no IR, radar detection)
* 5745 MHz [149] (20.0 dBm) (no IR)
* 5765 MHz [153] (20.0 dBm) (no IR)
* 5785 MHz [157] (20.0 dBm) (no IR)
* 5805 MHz [161] (20.0 dBm) (no IR)
* 5825 MHz [165] (20.0 dBm) (no IR)
valid interface combinations:
* #{ IBSS } <= 1, #{ managed, AP, mesh point } <= 8,
total <= 8, #channels <= 1, STA/AP BI must match, radar detect widths: { 20 MHz (no HT), 20 MHz, 40 MHz, 80 MHz }
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
Supported extended features:
* [ VHT_IBSS ]: VHT-IBSS
* [ RRM ]: RRM
* [ CQM_RSSI_LIST ]: multiple CQM_RSSI_THOLD records
* [ CONTROL_PORT_OVER_NL80211 ]: control port over nl80211
* [ TXQS ]: FQ-CoDel-enabled intermediate TXQs
I have 3 * KuWfi Tenbay WIFI-6 AX T-MB5EU-V01 with MT7915e and with OpenWrt 21.02.1 i have information similar to your second post ...
lukestu
November 18, 2022, 2:58pm
6
I have a Xiaomi R4AG Gigabit router and have this very issue too. Running version Openwrt r21243 patched to support the EN25QX128A chipset. After overcoming that hurdle I found that the 5ghz network is stuck on 3dbm for TX.
Does anyone know if this is fixed in a newer release, or if there is another way to fix it?
1 Like