[FS#4097] "Fails": setting TxPower to 0,1,2 dBm with mt76 on GL-MT300N-V2 (SoC MT7628N)

[OpenWrt Bugs]

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User who did this - ghmon (ghmon) 

Attached to Project - OpenWrt/LEDE Project
Summary - "Fails": setting TxPower to 0,1,2 dBm with mt76 on GL-MT300N-V2 (SoC MT7628N)
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - I own a power density meter (and now how to use it) and checked how 0..20 dBm setting and applying with LuCi affects power density.

Surprising **not expected** result: 0,1,2 dBm result in slightly **higher** power densities than 20 dBm. As expected: 3 dBm is a very lowe value, increasing with higher settings up to 20 dBm.

So either the driver or the hardware does not support that values, for whatever reason; might be a bug. I found nothing in the mt7628n data sheet for this issue.

Suggestion - LuCi should not allow to set these values, or mt76 (if it's not a bug in mt76) should set 3 dBm for 0,1,2 dBm.


More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=4097

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