[Bug 1878296] Autopkgtest regression report (linux-oracle-5.4/5.4.0-1019.19~18.04.1)

All autopkgtests for the newly accepted linux-oracle-5.4 (5.4.0-1019.19~18.04.1) for bionic have finished running.
The following regressions have been reported in tests triggered by the package:

zfs-linux/unknown (armhf)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/bionic/update_excuses.html#linux-oracle-5.4

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1878296

Title:
rtl8723bu wifi issue after being turned off

Status in linux package in Ubuntu:
Confirmed
Status in linux-oem-osp1 package in Ubuntu:
Invalid
Status in linux source package in Bionic:
Fix Committed
Status in linux-oem-osp1 source package in Bionic:
Fix Released
Status in linux source package in Eoan:
Fix Committed
Status in linux-oem-osp1 source package in Eoan:
Fix Released
Status in linux source package in Focal:
Fix Committed
Status in linux-oem-osp1 source package in Focal:
Invalid
Status in linux source package in Groovy:
Confirmed
Status in linux-oem-osp1 source package in Groovy:
Invalid

Bug description:
[SRU Justification]

[Impact]
With the rtl8723bu Wi-Fi/Bluetooth combo adapter, if the wifi is turned
off and then turned on again under the circumstance that a Bluetooth
device was paired previously, the system can't connect to a wireless
network until the system is rebooted.

[Fix]
Commit e542e66b7c2e("rtl8xxxu: add bluetooth co-existence support for
single antenna"), which landed v5.5 and as its subject suggests, support
bluetooth co-existence for RTL8723BU and fixes WiFi disconnection
problem when Bluetooth is in action.

Commit a9bb0b515778("rtl8xxxu: Improve TX performance of RTL8723BU on
rtl8xxxu driver") was added as a prerequisite to aforementioned fix.

Commit 4fcef8609132("rtl8xxxu: remove set but not used variable
'rate_mask'") and commit eac08515d7bd("rtl8xxxu: Remove set but not used
variable 'vif','dev','len'") are included as minor fixes to previous
commits.

[Test Case]
1. Turn on Wi-Fi and get associated with some AP.
2. Pair some bluetooth device.
3. Turn off Wi-Fi and turn again.
4. Expect Wi-Fi reconnects to the previous associated AP.

[Regression Potential]
Low. Both commits only affect RTL8723BU.

========== Original Bug Description ==========

With the rtl8723bu wireless adapter, if the wifi is turned off and then turned on again, the system can't connect to a wireless network until the system is rebooted.
The issue is not upstream. With mainline kernel and in other distros, everything works fine.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-29-generic 5.4.0-29.33
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: user 1384 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue May 12 19:02:49 2020
InstallationDate: Installed on 2020-05-12 (0 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 090c:037c Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) 300k Pixel Camera
 Bus 001 Device 003: ID 0bda:b720 Realtek Semiconductor Corp. 802.11n WLAN Adapter
 Bus 001 Device 002: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Positivo Tecnologia SA N1240
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-29-generic root=UUID=984e1018-1354-474e-83a9-b8ab7a761be7 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-29-generic N/A
 linux-backports-modules-5.4.0-29-generic N/A
 linux-firmware 1.187
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/15/2019
dmi.bios.vendor: Desenvolvido por Positivo Tecnologia SA
dmi.bios.version: V1.09.X
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: N14DP6
dmi.board.vendor: Positivo Tecnologia SA
dmi.board.version: 11139547
dmi.chassis.asset.tag: To be filled by O.E.M.
dmi.chassis.type: 10
dmi.chassis.vendor: Positivo Tecnologia SA
dmi.chassis.version: To be filled by O.E.M.
dmi.modalias: dmi:bvnDesenvolvidoporPositivoTecnologiaSA:bvrV1.09.X:bd07/15/2019:svnPositivoTecnologiaSA:pnN1240:pvrTobefilledbyO.E.M.:rvnPositivoTecnologiaSA:rnN14DP6:rvr11139547:cvnPositivoTecnologiaSA:ct10:cvrTobefilledbyO.E.M.:
dmi.product.family: MASTER
dmi.product.name: N1240
dmi.product.sku: 3052532
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Positivo Tecnologia SA

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