I actually never needed to upgrade to an unstable pkg. Thanks!
I am happy to be on testing so that I can help the community catch these issues. Still, it seems strange that there have been four patches during the 5.9 kernel branch so far that have broken my install (two trackpad patches, a WiFi chipset patch, and now this one). Perhaps there has been a renewed focus on the hardware I happen to have, but this is the first time I have experienced this many kernel issues with Manjaro testing.
Don’t get me wrong: I will still stay on testing because right now it’s the best way I can give back to this great community (no free time for coding these days). I just cross my fingers a little harder with each update. 
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I have random systemsettings5 crashes when trying to access some menus, for example if I go to Workspace behavior -> Desktop Effects it crashes with following journal log:
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/FormLayout.qml:295:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/FormLayout.qml:295:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/FormLayout.qml:295:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/FormLayout.qml:295:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/FormLayout.qml:295:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/FormLayout.qml:295:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/FormLayout.qml:295:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/FormLayout.qml:295:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/FormLayout.qml:295:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/FormLayout.qml:295:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/FormLayout.qml:295:13: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/templates/AbstractApplicationHeader.qml:153:9: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/templates/AbstractApplicationHeader.qml:83:5: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/templates/AbstractApplicationHeader.qml:108:9: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/private/globaltoolbar/BreadcrumbControl.qml:24:5: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/private/globaltoolbar/PageRowGlobalToolBarUI.qml:65:9: QML RowLayout (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "maximumWidth"
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/private/globaltoolbar/PageRowGlobalToolBarUI.qml:65:9: QML RowLayout (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "maximumWidth"
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/private/globaltoolbar/PageRowGlobalToolBarUI.qml:65:9: QML RowLayout (parent or ancestor of QQuickLayoutAttached): Binding loop detected for property "maximumWidth"
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/AbstractApplicationItem.qml:311:9: QML Binding: Not restoring previous value because restoreMode has not been set.
This behavior is deprecated.
You have to import QtQml 2.15 after any QtQuick imports and set
the restoreMode of the binding to fix this warning.
In Qt < 6.0 the default is Binding.RestoreBinding.
In Qt >= 6.0 the default is Binding.RestoreBindingOrValue.
16/11/2020 14:28 systemsettings5 file:///usr/lib/qt/qml/org/kde/kirigami.2/AbstractApplicationItem.qml:311:9: QML Binding: Not restoring previous value because restoreMode has not been set.
This behavior is deprecated.
You have to import QtQml 2.15 after any QtQuick imports and set
the restoreMode of the binding to fix this warning.
In Qt < 6.0 the default is Binding.RestoreBinding.
In Qt >= 6.0 the default is Binding.RestoreBindingOrValue.
16/11/2020 14:28 audit ANOM_ABEND auid=1000 uid=1000 gid=1001 ses=1 subj==unconfined pid=6939 comm="systemsettings5" exe="/usr/bin/systemsettings5" sig=11 res=1
16/11/2020 14:28 kernel audit: type=1701 audit(1605533288.998:250): auid=1000 uid=1000 gid=1001 ses=1 subj==unconfined pid=6939 comm="systemsettings5" exe="/usr/bin/systemsettings5" sig=11 res=1
16/11/2020 14:28 audit BPF prog-id=90 op=LOAD
16/11/2020 14:28 audit BPF prog-id=91 op=LOAD
16/11/2020 14:28 audit SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@1-6970-0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
16/11/2020 14:28 kernel audit: type=1334 audit(1605533289.011:251): prog-id=90 op=LOAD
16/11/2020 14:28 kernel audit: type=1334 audit(1605533289.011:252): prog-id=91 op=LOAD
16/11/2020 14:28 kernel audit: type=1130 audit(1605533289.011:253): pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@1-6970-0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
16/11/2020 14:28 kwin_x11 Could not get Interfaces. "Message recipient disconnected from message bus without replying"
16/11/2020 14:28 kwin_x11 Could not get Interfaces. "The name :1.20 was not provided by any .service files"
16/11/2020 14:28 kwin_x11 qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 26577, resource id: 100663302, major code: 15 (QueryTree), minor code: 0
16/11/2020 14:28 kwin_x11 qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 26608, resource id: 29360350, major code: 18 (ChangeProperty), minor code: 0
16/11/2020 14:28 systemd-coredump Process 6939 (systemsettings5) of user 1000 dumped core.
Stack trace of thread 6939:
#0 0x0000000000000000 n/a (n/a + 0x0)
16/11/2020 14:28 audit SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@1-6970-0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
16/11/2020 14:28 kernel audit: type=1131 audit(1605533289.735:254): pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-coredump@1-6970-0 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
16/11/2020 14:28 audit BPF prog-id=91 op=UNLOAD
16/11/2020 14:28 audit BPF prog-id=90 op=UNLOAD
16/11/2020 14:28 kernel audit: type=1334 audit(1605533289.865:255): prog-id=91 op=UNLOAD
16/11/2020 14:28 kernel audit: type=1334 audit(1605533289.865:256): prog-id=90 op=UNLOAD
16/11/2020 14:28 audit SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-timedated comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
16/11/2020 14:28 kernel audit: type=1131 audit(1605533290.901:257): pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=systemd-timedated comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
16/11/2020 14:28 audit BPF prog-id=89 op=UNLOAD
16/11/2020 14:28 audit BPF prog-id=88 op=UNLOAD
16/11/2020 14:28 kernel audit: type=1334 audit(1605533290.918:258): prog-id=89 op=UNLOAD
Not sure how to find the reason. If anyone has some places to look at or some things to try to reset some things please share.
//EDIT: seem fixed by deleting ~/.config/plasmashellrc and ~/.config/plasma-org.kde.plasma.desktop-appletsrc then rebooting and reconfiguring a few things.
//EDIT: also KDE Application launcher doesn't open when Meta key is pressed
Only on brandnew ones supported by driver version 455 and above.
Nvidia driver version 390 is not available for kernel 5.9 - and possibly never will 
Here’s what inxi -Fxxxza --no-host says about my system:
System: Kernel: 5.8.18-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0
parameters: BOOT_IMAGE=/boot/vmlinuz-5.8-x86_64 root=UUID=345b76c0-f339-4ca7-8582-440f229512a1 rw quiet
acpi_enforce_resources=lax "acpi_osi=Windows 2009" loglevel=3 root=UUID=345b76c0-f339-4ca7-8582-440f229512a1 ro
resume=UUID=a9353f2a-2cf9-4d4e-ada9-f72d8602045e vga=off nvidia-drm.modeset=1
Desktop: Pantheon info: wingpanel, plank wm: gala dm: LightDM 1.30.0 Distro: Manjaro Linux
Machine: Type: Desktop Mobo: Foxconn model: H67M-S/H67M-V/H67M serial: <filter> BIOS: American Megatrends v: C29F1P03
date: 03/15/2013
CPU: Info: Dual Core model: Intel Core i3-2105 bits: 64 type: MT MCP arch: Sandy Bridge family: 6 model-id: 2A (42)
stepping: 7 microcode: 2F L2 cache: 3072 KiB
flags: avx lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 bogomips: 24754
Speed: 3093 MHz min/max: 1600/3100 MHz Core speeds (MHz): 1: 3093 2: 3093 3: 3093 4: 3093
Vulnerabilities: Type: itlb_multihit status: KVM: VMX unsupported
Type: l1tf mitigation: PTE Inversion
Type: mds mitigation: Clear CPU buffers; SMT vulnerable
Type: meltdown mitigation: PTI
Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via prctl and seccomp
Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional, IBRS_FW, STIBP: conditional, RSB filling
Type: srbds status: Not affected
Type: tsx_async_abort status: Not affected
Graphics: Device-1: NVIDIA GF116 [GeForce GTX 550 Ti] vendor: Gigabyte driver: nvidia v: 390.132
alternate: nouveau,nvidia_drm bus ID: 01:00.0 chip ID: 10de:1244
Display: x11 server: X.Org 1.20.9 driver: nvidia display ID: :0 screens: 1
Screen-1: 0 s-res: 3600x1080 s-dpi: 96 s-size: 953x286mm (37.5x11.3") s-diag: 995mm (39.2")
Monitor-1: DVI-I-2 res: 1920x1080 hz: 60 dpi: 82 size: 598x336mm (23.5x13.2") diag: 686mm (27")
Monitor-2: DVI-I-3 res: 1680x1050 hz: 60 dpi: 90 size: 474x296mm (18.7x11.7") diag: 559mm (22")
Message: Unable to show advanced data. Required tool glxinfo missing.
Audio: Device-1: Intel 6 Series/C200 Series Family High Definition Audio vendor: Foxconn driver: snd_hda_intel v: kernel
bus ID: 00:1b.0 chip ID: 8086:1c20
Device-2: NVIDIA GF116 High Definition Audio vendor: Gigabyte driver: snd_hda_intel v: kernel bus ID: 01:00.1
chip ID: 10de:0bee
Device-3: Creative Live! Cam Chat HD [VF0700] type: USB driver: hid-generic,snd-usb-audio,usbhid,uvcvideo
bus ID: 1-1.3:5 chip ID: 041e:4097 serial: <filter>
Sound Server: ALSA v: k5.8.18-1-MANJARO
Network: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Foxconn driver: r8169 v: kernel port: d000
bus ID: 03:00.0 chip ID: 10ec:8168
IF: enp3s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
Device-2: AVM Fritz!Card PCI v2.0 ISDN driver: N/A modules: avmfritz port: c000 bus ID: 05:01.0 chip ID: 1244:0e00
Drives: Local Storage: total: 1.35 TiB used: 350.20 GiB (25.4%)
SMART Message: Unable to run smartctl. Root privileges required.
ID-1: /dev/sda vendor: Intenso model: SSD SATAIII size: 447.13 GiB block size: physical: 512 B logical: 512 B
speed: 6.0 Gb/s serial: <filter> rev: 4A0 scheme: MBR
ID-2: /dev/sdb vendor: Seagate model: ST31000333AS size: 931.51 GiB block size: physical: 512 B logical: 512 B
speed: 3.0 Gb/s rotation: 7200 rpm serial: <filter> rev: CC3H scheme: MBR
Partition: ID-1: / raw size: 438.54 GiB size: 430.65 GiB (98.20%) used: 108.16 GiB (25.1%) fs: ext4 dev: /dev/sda1
ID-2: /home raw size: 915.00 GiB size: 899.64 GiB (98.32%) used: 241.79 GiB (26.9%) fs: ext4 dev: /dev/sdb1
Swap: Kernel: swappiness: 60 (default) cache pressure: 100 (default)
ID-1: swap-1 type: partition size: 16.51 GiB used: 255.9 MiB (1.5%) priority: -2 dev: /dev/sdb2
Sensors: System Temperatures: cpu: 58.0 C mobo: 27.8 C gpu: nvidia temp: 55 C
Fan Speeds (RPM): N/A gpu: nvidia fan: 59%
Info: Processes: 237 Uptime: 1d 22h 36m Memory: 7.74 GiB used: 4.28 GiB (55.4%) Init: systemd v: 246 Compilers:
gcc: 10.2.0 clang: 11.0.0 Packages: pacman: 1486 lib: 372 Shell: Bash v: 5.0.18 running in: io.elementary.t
inxi: 3.1.08