MT7612E tx power locked in 3bm

marcusleandroreis · December 18, 2021, 7:26am

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.

anon89577378 · December 18, 2021, 9:00am

Run cat /etc/config/wireless and post the results.

Redact passwords in the "option key" sections.

dsouza · December 18, 2021, 11:13am

This is likely to be a known mt76 driver issue that hasn't been solved yet which affects multiple devices. See more details below:

github.com/openwrt/mt76

mt76 TX power not working in multiple chipsets (mt7610, mt7613, mt7615, mt7603)

opened 11:35AM - 05 Dec 21 UTC

d-me3

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.

marcusleandroreis · December 20, 2021, 12:49pm

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

anon69880279 · December 20, 2021, 11:26pm

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

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?

glxwrt · May 31, 2023, 8:08pm

About 2 weeks ago, having seen on kernel.org that a bugfix was apparently in, I flashed latest SNAPSHOT for my hardware (a GL-iNet AR-750) and excitedly tested my MT7610U dongle, but the txpower was still limited extremely low.

What am I missing? Does anyone know when the bugfix will make it into SNAPSHOT?

slh · May 31, 2023, 8:23pm

mac80211 (and mt76 in particular) are taken from newer mainline/ upstream backports, detached from the base kernel. The current state of these drivers is https://git.openwrt.org/?p=openwrt/openwrt.git;a=commitdiff;h=f7665a0f1a2da63e2046119c0c3de578f16651ce - which may, or may not contain your required changes.

glxwrt · May 31, 2023, 8:23pm

Thank you, I will look for clues!