Resubmitted as https://lists.ubuntu.com/archives/kernel-
team/2020-May/110116.html
** Description changed:
+ [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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https://bugs.launchpad.net/bugs/1878296
Title:
rtl8723bu wifi issue after being turned off
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