I upgraded my Dell 5520 laptop from Zesty to Artful over a month ago
now, and I'm seeing behavior pretty much exactly as described by Max,
starting immediately after the upgrade. I've been stuck either plugging
into my wired ethernet adapter, tethering with my phone, or just living
without connectivity because the wifi connection has been so unreliable.
Sometimes (frequently right after a clean boot) it works just fine, and
I'm having no problems meeting sustained, reliable, fast speeds for
maybe a minute, but it breaks down pretty quickly (sometimes even just
after just 10 to 15 seconds after wifi connects), and I see nothing but
long windows of 100% packet loss. If I monitor long enough, it seems to
recover for a brief window of time, but pretty quickly goes right back
to 100% packet loss (in windows of maybe 30 seconds to a few minutes).
This has been observed even today with the latest 4.13.0-19-generic
kernel.
For the first week or two after the upgrade, I've been trying to
determine if it was just limited to specific access points I was using,
but I've observed this same behavior while connected to 3 different
locations, with 3 wildly different wifi systems.
I also thought it might be the wifi adapter drivers in a kernel upgrade
(this laptop has a builtin Intel Wireless 8265 card, using iwlwifi), so
I picked up an Archer T4UH V2 (based on the Realtek RTL8812AU chipset)
just in case using a different wifi driver would be enough to have
working wifi again, but I'm seeing the same behavior with that adapter
as well.
So it certainly seems related to wifi functionality only, but also not
driver specific.
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https://bugs.launchpad.net/bugs/1722109
Title:
iwlwifi regression in artful - intermittent total packet loss
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