MT7925 (Filogic 360) TX power capped at 3 dBm instead of ~23 dBm on 5GHz

Description:

The MT7925 WiFi adapter is transmitting at only 3.00 dBm on 5GHz (channel 44, 5220 MHz), despite the regulatory domain
(US) allowing up to 23 dBm on that band. This results in noticeably degraded WiFi performance and weak signal.

Hardware:

• Card: MediaTek MT7925 802.11be 160MHz 2x2 PCIe Wireless Network Adapter (Filogic 360)
• Driver: mt7925e

System info:

• Kernel: 6.19.11-201.nobara.fc43.x86_64
• Firmware: linux-firmware-20260309-1.fc43.noarch

Observed behavior:
iw dev wlp99s0 info | grep txpower
txpower 3.00 dBm

Expected behavior:
TX power should be ~23 dBm as permitted by iw reg get for US regulatory domain on the 5150–5250 MHz band.

Regulatory domain:
country US: DFS-FCC
(5150 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW

Additional notes:

• WiFi power save disabled via NetworkManager — did not fix TX power issue
• Signal strength is -78 dBm, likely worsened by the low TX power
• Previously on Pop!_OS (Ubuntu-based), performance was noticeably better on the same hardware

Start by reproducing the 3.00 dBm result with iw dev wlp99s0 info and check the US regulatory output with iw reg get. Trace the mt7925e TX-power and regulatory handling for the MT7925 on 5 GHz, and verify that channel 44 can reach the permitted ~23 dBm without weakening regulatory limits.