Re: [PATCH wireless] wifi: mt76: mt792x: treat 0xff ACPI SAR entries as no limit

[Cristian Fleischer]

On Thu, 10 Sep 2026 09:23:00 +0800, Junjie Cao wrote:
> Some ASUS firmware includes 0xff values in MTGS power slots.

Same failure on an ASUS Vivobook S 16 M5606WA (MT7922, mt7921e, BIOS
M5606WA.316), kernel 7.2.4 with this patch applied on top.

The DSDT carries MTCL version 2, MTDS with two identical tables
(1A 19 17 11 15 10 12 12 12 12 10) and MTGS version 4 with pwr 0xff in
every slot (offset 0x00 in entry 1, 0xff in entries 2-6). Region ETSI.

Before, txpower_sku showed tmac 3 for every OFDM/HT/VHT/HE rate on every
channel; the AP never answered auth frames from a few rooms away and TX
sat at 6 Mbit/s with ~3 retries per frame once associated.

After:
  5 GHz ch 36/80 MHz: tmac 29, TX/RX 866 Mbit/s VHT-MCS 9, 7 retries in
  776 frames, association succeeds from the spot that used to fail.
  2.4 GHz ch 11:      tmac 30, TX 117 / RX 104 Mbit/s.

Tested-by: Cristian Fleischer <cristian.fleischer@xxxxxxxxx>