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Lenovo Yoga 920 / Qualcomm Atheros QCA61X4a -- slow wifi
Hi all. I just picked up a Yoga 920 (model 13IKB) which has a Qualcomm Atheros QCA61X4a wifi card. I'm having speed issues. On the same network as three other wireless devices, it gets a fraction of the available connection -- and what I get degrades over time.
I'm running Win10 build 1703 because 1709 was worse.
Things I've tried:
- Replaced the machine to rule out a bad card or a wonky Windows install
- Reinstalled latest drivers (12.0.0.318) -- even tried some Thinkpad drivers that were newer for the same card
- Set Roaming Aggressiveness in the driver properties to both 1 (lowest) and 5 (highest)
- Used a wifi analyzer to check the best 5 GHz channel for my apartment
- Disabled 2.4GHz entirely on my router, along with 802:11a
- Disabled WMM on my router, along with WMM Power Saving; the laptop could then not connect
- Verified the issue on two other home networks
- Called my ISP and had them check the health of my router -- it's at 100% health and serves up 150-180 Mbps quite happily to other devices
- Set my Atheros card to run on high performance in the power plan options
- Pinged a bunch of stuff -- no dropped packets
- Network Reset -- this gets it up to maybe 70% of the connection most of the time, but then the connection degrades again. I have to do it repeatedly
I'm pretty much at the limit of my ability to diagnose, as I sit here at 3 Mbps on a connection that my fully updated Windows desktop (ethernet unplugged) pulls down at 180. Lenovo support is obviously useless and nobody on their boards knows.
Any help would be greatly appreciated! Are these cards just weak or is this drivers / Windows? Thanks!