low tx power with mt76x0e driver

Hello,
There is still a problem with low tx power using 5G driver mt76x0e.
Here is the router information:

system type : MediaTek MT7628AN ver:1 eco:2
machine : TP-Link Archer C20 v5

iw phy

Wiphy phy1
wiphy index: 1
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)
Device supports AP-side u-APSD.
Device supports T-DLS.
Available Antennas: TX 0x1 RX 0x1
Configured Antennas: TX 0x1 RX 0x1
Supported interface modes:
* IBSS
* managed
* AP
* AP/VLAN
* monitor
* mesh point
* P2P-client
* P2P-GO
Band 2:
Capabilities: 0x17e
HT20/HT40
SM Power Save disabled
RX Greenfield
RX HT20 SGI
RX HT40 SGI
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: 0-7
VHT Capabilities (0x31800120):
Max MPDU length: 3895
Supported Channel Width: neither 160 nor 80+80
short GI (80 MHz)
RX antenna pattern consistency
TX antenna pattern consistency
VHT RX MCS set:
1 streams: MCS 0-9
2 streams: not supported
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: not supported
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] (14.0 dBm)
* 5200 MHz [40] (14.0 dBm)
* 5220 MHz [44] (13.0 dBm)
* 5240 MHz [48] (13.0 dBm)
* 5260 MHz [52] (12.0 dBm) (radar detection)
* 5280 MHz [56] (12.0 dBm) (radar detection)
* 5300 MHz [60] (12.0 dBm) (radar detection)
* 5320 MHz [64] (12.0 dBm) (radar detection)
* 5500 MHz [100] (disabled)
* 5520 MHz [104] (disabled)
* 5540 MHz [108] (disabled)
* 5560 MHz [112] (disabled)
* 5580 MHz [116] (disabled)
* 5600 MHz [120] (disabled)
* 5620 MHz [124] (disabled)
* 5640 MHz [128] (disabled)
* 5660 MHz [132] (disabled)
* 5680 MHz [136] (disabled)
* 5700 MHz [140] (disabled)
* 5720 MHz [144] (disabled)
* 5745 MHz [149] (16.0 dBm)
* 5765 MHz [153] (16.0 dBm)
* 5785 MHz [157] (16.0 dBm)
* 5805 MHz [161] (16.0 dBm)
* 5825 MHz [165] (16.0 dBm)
* 5845 MHz [169] (disabled)
* 5865 MHz [173] (disabled)
valid interface combinations:
* #{ IBSS } <= 1, #{ managed, AP, mesh point, P2P-client, P2P-GO } <= 8,
total <= 8, #channels <= 1, STA/AP BI must match, radar detect widths: { 20 MHz (no HT), 20 MHz, 40 MHz, 80 MHz }

5Gz wifi is using 14db (25mW) which is useless after 5 meters away from the router.
Maybe driver is reading the power from wrong location ?
I may supply rom/radio for that router if someone needs to.

2.4Gz is fine.

Start by reproducing the reported 5 GHz transmit-power result with iw phy on the TP-Link Archer C20 v5 using the mt76x0e driver, and compare it with the working 2.4 GHz behavior. Done means identifying why the reported 5 GHz power is limited to 12–16 dBm and documenting or correcting the driver behavior with evidence from this hardware.