[Bug 1862760] Re: Unreliable 802.11ac connection on our raspi images

[Dave Jones]

At this point, we've had all the necessary firmware blobs for numerous
releases and I'm reasonably convinced that the remaining AC wifi issues
are largely related to incorrect regulatory domain, because we don't
provide a friendly way of setting this on desktop (see LP: #1951586 for
more on this).

I'm going to mark bionic as won't fix as it's EOL (sans ESM) anyway,
focal as fix released as we did add all the relevant blobs (at the time)
as a back-port to that, and the devel versions as fix released.

If anyone is still have 802.11ac connectivity issues, I strongly
recommend checking the wifi regulatory domain with "iw reg get". If it
doesn't match your expected country, please see:

* For server, see the "regulatory-domain" setting under "wifis:" in
netplan -- https://netplan.readthedocs.io/en/stable/netplan-
yaml/#properties-for-device-type-wifis

* For desktop, add "cfg80211.ieee80211_regdom=CC" where CC is your
country code to "/boot/firmware/cmdline.txt" and reboot. Urgh.

** Changed in: linux-firmware (Ubuntu)
       Status: New => Invalid

** Changed in: linux-firmware (Ubuntu Bionic)
       Status: New => Invalid

** Changed in: linux-firmware (Ubuntu Focal)
       Status: New => Invalid

** Changed in: linux-firmware-raspi2 (Ubuntu)
       Status: Triaged => Fix Released

** Changed in: linux-firmware-raspi2 (Ubuntu Bionic)
       Status: New => Won't Fix

** Changed in: linux-firmware-raspi2 (Ubuntu Focal)
       Status: Triaged => Fix Released

** Changed in: linux-raspi (Ubuntu)
       Status: New => Invalid

** Changed in: linux-raspi (Ubuntu Focal)
       Status: New => Invalid

** Changed in: linux-raspi2 (Ubuntu)
       Status: New => Invalid

** Changed in: netplan.io (Ubuntu)
       Status: New => Invalid

** Changed in: netplan.io (Ubuntu Bionic)
       Status: New => Invalid

** Changed in: netplan.io (Ubuntu Focal)
       Status: New => Invalid

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Title:
  Unreliable 802.11ac connection on our raspi images

Status in linux-firmware package in Ubuntu:
  Invalid
Status in linux-firmware-raspi2 package in Ubuntu:
  Fix Released
Status in linux-raspi package in Ubuntu:
  Invalid
Status in linux-raspi2 package in Ubuntu:
  Invalid
Status in netplan.io package in Ubuntu:
  Invalid
Status in linux-firmware source package in Bionic:
  Invalid
Status in linux-firmware-raspi2 source package in Bionic:
  Won't Fix
Status in linux-raspi2-5.3 source package in Bionic:
  Won't Fix
Status in netplan.io source package in Bionic:
  Invalid
Status in linux-firmware source package in Eoan:
  Won't Fix
Status in linux-firmware-raspi2 source package in Eoan:
  Won't Fix
Status in linux-raspi2-5.3 source package in Eoan:
  Won't Fix
Status in netplan.io source package in Eoan:
  Won't Fix
Status in linux-firmware source package in Focal:
  Invalid
Status in linux-firmware-raspi2 source package in Focal:
  Fix Released
Status in linux-raspi source package in Focal:
  Invalid
Status in netplan.io source package in Focal:
  Invalid

Bug description:
  We were not able to completely pin-point the issue yet, so this is
  more of a blanket bug for the current issues we are seeing. We don't
  know where exactly the issue can be located.

  While preparing and testing 18.04.4, certification reported issues
  with our uc18 images on the pi4 with wifi ac tests. One of our
  engineers (Brian) confirmed it locally with a wifi access point
  restricted only to 802.11ac. After some additional testing, he noticed
  that he had the same unreliable symptoms for both the classic and core
  images, as well as the 19.10.1 classic images. The symptoms seem to
  vary, from inability to detect 802.11ac APs, inability to connect
  and/or receive an IP address and no traffic getting through.

  We will provide all the information that we have. Raspbian works
  better in this regard. We have pulled in the wifi firmware bits from
  Raspbian and using those, and that seems to resolve all flakiness.

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