Fixes slow 802.11ax upload on the RT3200 with mt7915 non DBDC. In AX mode the AX upstream to the MT7915 radio drops to the slowest connection mode: MCS0 (zero) single stream NSS1. The issue has been observed on Apple devices and Intel cards under upload load and with some obstacles in line of sight and distance to the AP. While under the same conditions AC speeds would be much better. "It is probably a firmware blob bug that is being worked around by disabling AC 160mhz. Unfortunately, even if users select 80mhz AX in Luci this bug will happen. Basically, without this patch AX is completely useless for people with affected devices. So in my opinion, disabling 160mhz AC seems like a small price to pay to solve this bug, especially since 160mhz AX remains available." "160 MHz capabilites are out of specification for MT7915. MT7915 was never advertised with 160 MHz capabilities, our devices here are instead marketed with 80 MHz bandwith numbers: AX3200 - 80 MHz channels. Mediatek - the vendor - has completely dropped 160 MHz channel support for MT7915: [MAC80211][mt76][remove mt7915 BW160 support] With the out of specification AC VHT160 capability enabled the whole AX capability is wasted for several users, because it will slow down some AX capable stations to the slowest AX uplink rates. The user workaround to switch MT7915 to AC mode works but no AX advantages that the device was bought for can be used." Forum thread https://forum.openwrt.org/t/802-11ax-worse-than-802-11ac-with-mt76-driver/126466 Partially reverts https://patchwork.kernel.org/project/linux-wireless/patch/20230301163739.52314-1-nbd@xxxxxxxx/ Signed-off-by: Anteus <anteus92@xxxxxxxxx> --- mt7915/init.c | 1 - 1 file changed, 1 deletion(-) --- a/mt7915/init.c +++ b/mt7915/init.c @@ -420,7 +420,6 @@ mt7915_init_wiphy(struct mt7915_phy *phy if (!dev->dbdc_support) vht_cap->cap |= IEEE80211_VHT_CAP_SHORT_GI_160 | - IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ | FIELD_PREP(IEEE80211_VHT_CAP_EXT_NSS_BW_MASK, 1); } else { vht_cap->cap |=
