#20369: Xiaomi mini Wireless signal is very weak
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Reporter: rexchou | Owner: developers
Type: defect | Status: new
Priority: high | Milestone: Chaos Calmer (trunk)
Component: kernel | Version: Trunk
Resolution: | Keywords:
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Comment (by AndreiM):
Right, the `mt76` will suffer improvements, I'm sure; there are good
people working on it, alas too few…
Digression aside, yes, the 2.4 GHz throughput is very low. Even now
(50-80% faster), it behaves more like 11g :-( I think all the PA/LNA magic
happens in the
[https://dev.openwrt.org/browser/trunk/target/linux/ramips/patches-3.18/0030
-pinctrl-ralink-add-pinctrl-driver.patch `pinctrl` driver], where `rt305x`
has hooks for both PA and LNA, whereas `mt7620` only has support for the
former. We could attempt to mirror the LNA stuff (e.g.,
`RT3352_GPIO_MODE_LNA` -> `MT7620_GPIO_MODE_LNA`, `rt3352_lna_func` ->
`lna_grp`, etc), but the major piece of information missing is the content
of `lna_grp[] = { FUNC("lna", 0, ?, ?) }`… Looking at the `MT7620` data
sheet, I think some sort of LNA exists, although
[https://lists.openwrt.org/pipermail/openwrt-
devel/2015-September/035571.html people claim no external PA or LNA].
At this point, I only now that I increased my received signal strength
from very low to usable (about +15 in SNR); if we manage something similar
for LNA, it'd be great. We just need to find the right `pin_first` &
`pin_count`…
--
Ticket URL: <https://dev.openwrt.org/ticket/20369#comment:8>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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