Kernel 5.11.0-43 doesn't allow system to reboot or shutdown

[Raffaele Bruno]

System specs:
description: Notebook
    product: HP 255 G7 Notebook PC (7DB74EA)
    vendor: HP
    version: Type1ProductConfigId
    serial: CND9330DQ6
    width: 64 bits
    capabilities: smbios-3.0.1 dmi-3.0.1 smp vsyscall32
    configuration: boot=normal chassis=notebook family=103C_5336AN HP Notebook sku=7DB74EA uuid=1732FB04-2B5A-11E9-8BB6-B00CD1E6A559
  *-core
       description: Motherboard
       product: 84AC
       vendor: HP
       physical id: 0
       version: 85.32
       serial: PHZEUB2MYBWZ91
       slot: Type2 - Board Chassis Location
     *-firmware
          description: BIOS
          vendor: Insyde
          physical id: 0
          version: F.36
          date: 06/08/2021
          size: 128KiB
          capacity: 8MiB
          capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppynec int13floppytoshiba int13floppy360 int13floppy1200 int13floppy720 int13floppy2880 int9keyboard int10video acpi usb uefi
     *-cpu
          description: CPU
          product: AMD A4-9125 RADEON R3, 4 COMPUTE CORES 2C+2G
          vendor: Advanced Micro Devices [AMD]
          physical id: 4
          bus info: cpu@0
          version: AMD A4-9125 RADEON R3, 4 COMPUTE CORES 2C+2G
          serial: Unknown
          slot: Socket FP4
          size: 1797MHz
          capacity: 2300MHz
          width: 64 bits
          clock: 100MHz
          capabilities: lm fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp x86-64 constant_tsc rep_good acc_power nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm perfctr_core perfctr_nb bpext ptsc mwaitx cpb hw_pstate ssbd ibpb vmmcall fsgsbase bmi1 avx2 smep bmi2 xsaveopt arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif overflow_recov cpufreq
          configuration: cores=2 enabledcores=2 threads=2
        *-cache:0
             description: L1 cache
             physical id: 5
             slot: L1-Cache
             size: 160KiB
             capacity: 160KiB
             clock: 1GHz (1.0ns)
             capabilities: pipeline-burst internal write-back unified
             configuration: level=1
        *-cache:1
             description: L2 cache
             physical id: 6
             slot: L2-Cache
             size: 1MiB
             capacity: 1MiB
             clock: 1GHz (1.0ns)
             capabilities: pipeline-burst internal write-back unified
             configuration: level=2
     *-memory
          description: System Memory
          physical id: 20
          slot: System board or motherboard
          size: 8GiB
        *-bank
             description: SODIMM DDR4 Synchronous Unbuffered (Unregistered) 1866 MHz (0,5 ns)
             product: 9905700-024.A00G
             vendor: Kingston
             physical id: 0
             serial: E5180F06
             slot: Bottom-slot 1(left)
             size: 8GiB
             width: 64 bits
             clock: 1866MHz (0.5ns)
     *-pci:0
          description: Host bridge
          product: Family 15h (Models 60h-6fh) Processor Root Complex
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 100
          bus info: pci@0000:00:00.0
          version: 00
          width: 32 bits
          clock: 33MHz
        *-generic:0 UNCLAIMED
             description: IOMMU
             product: Family 15h (Models 60h-6fh) I/O Memory Management Unit
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 0.2
             bus info: pci@0000:00:00.2
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: msi ht bus_master cap_list
             configuration: latency=0
        *-display
             description: VGA compatible controller
             product: Stoney [Radeon R2/R3/R4/R5 Graphics]
             vendor: Advanced Micro Devices, Inc. [AMD/ATI]
             physical id: 1
             bus info: pci@0000:00:01.0
             version: e2
             width: 64 bits
             clock: 33MHz
             capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
             configuration: driver=amdgpu latency=0
             resources: irq:34 memory:e0000000-efffffff memory:f0000000-f07fffff ioport:4000(size=256) memory:f0c00000-f0c3ffff memory:c0000-dffff
        *-multimedia:0
             description: Audio device
             product: Advanced Micro Devices, Inc. [AMD/ATI]
             vendor: Advanced Micro Devices, Inc. [AMD/ATI]
             physical id: 1.1
             bus info: pci@0000:00:01.1
             version: 00
             width: 64 bits
             clock: 33MHz
             capabilities: pm pciexpress msi bus_master cap_list
             configuration: driver=snd_hda_intel latency=0
             resources: irq:38 memory:f0c60000-f0c63fff
        *-pci:0
             description: PCI bridge
             product: Family 15h (Models 60h-6fh) Processor Root Port
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 2.1
             bus info: pci@0000:00:02.1
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: pci pm pciexpress msi ht normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:25 ioport:1000(size=4096) memory:f0d00000-f0efffff ioport:f0f00000(size=2097152)
        *-pci:1
             description: PCI bridge
             product: Family 15h (Models 60h-6fh) Processor Root Port
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 2.2
             bus info: pci@0000:00:02.2
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: pci pm pciexpress msi ht normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:26 ioport:3000(size=4096) memory:f0b00000-f0bfffff
           *-network
                description: Ethernet interface
                product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
                vendor: Realtek Semiconductor Co., Ltd.
                physical id: 0
                bus info: pci@0000:02:00.0
                logical name: enp2s0
                version: 15
                serial: b0:0c:d1:e6:a5:59
                capacity: 1Gbit/s
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=5.11.0-43-generic firmware=rtl8168h-2_0.0.2 02/26/15 latency=0 link=no multicast=yes port=twisted pair
                resources: irq:28 ioport:3000(size=256) memory:f0b04000-f0b04fff memory:f0b00000-f0b03fff
        *-pci:2
             description: PCI bridge
             product: Family 15h (Models 60h-6fh) Processor Root Port
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 2.3
             bus info: pci@0000:00:02.3
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: pci pm pciexpress msi ht normal_decode bus_master cap_list
             configuration: driver=pcieport
             resources: irq:27 ioport:2000(size=4096) memory:f0a00000-f0afffff
           *-network
                description: Wireless interface
                product: RTL8821CE 802.11ac PCIe Wireless Network Adapter
                vendor: Realtek Semiconductor Co., Ltd.
                physical id: 0
                bus info: pci@0000:03:00.0
                logical name: wlo1
                version: 00
                serial: b0:68:e6:50:e9:d1
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
                configuration: broadcast=yes driver=rtw_8821ce driverversion=5.11.0-43-generic firmware=N/A ip=192.168.1.6 latency=0 link=yes multicast=yes wireless=IEEE 802.11
                resources: irq:36 ioport:2000(size=256) memory:f0a00000-f0a0ffff
        *-generic:1 UNCLAIMED
             description: Encryption controller
             product: Carrizo Platform Security Processor
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 8
             bus info: pci@0000:00:08.0
             version: 00
             width: 64 bits
             clock: 33MHz
             capabilities: msix ht pm bus_master cap_list
             configuration: latency=0
             resources: memory:f0c40000-f0c5ffff memory:f0900000-f09fffff memory:f0c6f000-f0c6ffff memory:f0c6a000-f0c6bfff
        *-multimedia:1
             description: Computer telephony device
             product: Family 15h (Models 60h-6fh) Audio Controller
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 9.2
             bus info: pci@0000:00:09.2
             version: 00
             width: 32 bits
             clock: 33MHz
             capabilities: pm bus_master cap_list
             configuration: driver=snd_hda_intel latency=0
             resources: irq:39 memory:f0c64000-f0c67fff
        *-usb:0
             description: USB controller
             product: FCH USB XHCI Controller
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 10
             bus info: pci@0000:00:10.0
             version: 20
             width: 64 bits
             clock: 33MHz
             capabilities: pm msi msix pciexpress xhci bus_master cap_list
             configuration: driver=xhci_hcd latency=0
             resources: irq:18 memory:f0c68000-f0c69fff
           *-usbhost:0
                product: xHCI Host Controller
                vendor: Linux 5.11.0-43-generic xhci-hcd
                physical id: 0
                bus info: usb@2
                logical name: usb2
                version: 5.11
                capabilities: usb-2.00
                configuration: driver=hub slots=4 speed=480Mbit/s
              *-usb
                   description: Video
                   product: HP Webcam
                   vendor: DHKQB019ICCA7Y
                   physical id: 1
                   bus info: usb@2:1
                   version: 0.05
                   serial: 200901010001
                   capabilities: usb-2.00
                   configuration: driver=uvcvideo maxpower=500mA speed=480Mbit/s
           *-usbhost:1
                product: xHCI Host Controller
                vendor: Linux 5.11.0-43-generic xhci-hcd
                physical id: 1
                bus info: usb@3
                logical name: usb3
                version: 5.11
                capabilities: usb-3.00
                configuration: driver=hub slots=4 speed=5000Mbit/s
        *-sata
             description: SATA controller
             product: FCH SATA Controller [AHCI mode]
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 11
             bus info: pci@0000:00:11.0
             version: 4b
             width: 32 bits
             clock: 66MHz
             capabilities: sata pm ahci_1.0 bus_master cap_list
             configuration: driver=ahci latency=64
             resources: irq:19 ioport:4118(size=8) ioport:4124(size=4) ioport:4110(size=8) ioport:4120(size=4) ioport:4100(size=16) memory:f0c6c000-f0c6c3ff
        *-usb:1
             description: USB controller
             product: FCH USB EHCI Controller
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 12
             bus info: pci@0000:00:12.0
             version: 49
             width: 32 bits
             clock: 66MHz
             capabilities: pm debug ehci bus_master cap_list
             configuration: driver=ehci-pci latency=32
             resources: irq:18 memory:f0c6d000-f0c6d0ff
           *-usbhost
                product: EHCI Host Controller
                vendor: Linux 5.11.0-43-generic ehci_hcd
                physical id: 1
                bus info: usb@1
                logical name: usb1
                version: 5.11
                capabilities: usb-2.00
                configuration: driver=hub slots=2 speed=480Mbit/s
              *-usb
                   description: USB hub
                   product: Root Hub
                   vendor: Advanced Micro Devices, Inc.
                   physical id: 1
                   bus info: usb@1:1
                   version: 0.18
                   capabilities: usb-2.00
                   configuration: driver=hub maxpower=100mA slots=4 speed=480Mbit/s
                 *-usb
                      description: Bluetooth wireless interface
                      product: Bluetooth Radio
                      vendor: Realtek
                      physical id: 4
                      bus info: usb@1:1.4
                      version: 1.10
                      serial: 00e04c000001
                      capabilities: bluetooth usb-1.10
                      configuration: driver=btusb maxpower=500mA speed=12Mbit/s
        *-serial
             description: SMBus
             product: FCH SMBus Controller
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 14
             bus info: pci@0000:00:14.0
             version: 4b
             width: 32 bits
             clock: 66MHz
             configuration: driver=piix4_smbus latency=0
             resources: irq:0
        *-isa
             description: ISA bridge
             product: FCH LPC Bridge
             vendor: Advanced Micro Devices, Inc. [AMD]
             physical id: 14.3
             bus info: pci@0000:00:14.3
             version: 11
             width: 32 bits
             clock: 66MHz
             capabilities: isa bus_master
             configuration: latency=0
     *-pci:1
          description: Host bridge
          product: Family 15h (Models 60h-6fh) Host Bridge
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 101
          bus info: pci@0000:00:02.0
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:2
          description: Host bridge
          product: Family 15h (Models 60h-6fh) Host Bridge
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 102
          bus info: pci@0000:00:03.0
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:3
          description: Host bridge
          product: Carrizo Audio Dummy Host Bridge
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 103
          bus info: pci@0000:00:09.0
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:4
          description: Host bridge
          product: Stoney HT Configuration
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 104
          bus info: pci@0000:00:18.0
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:5
          description: Host bridge
          product: Stoney Address Maps
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 105
          bus info: pci@0000:00:18.1
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:6
          description: Host bridge
          product: Stoney DRAM Configuration
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 106
          bus info: pci@0000:00:18.2
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pci:7
          description: Host bridge
          product: Stoney Miscellaneous Configuration
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 107
          bus info: pci@0000:00:18.3
          version: 00
          width: 32 bits
          clock: 33MHz
          configuration: driver=k10temp
          resources: irq:0
     *-pci:8
          description: Host bridge
          product: Stoney PM Configuration
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 108
          bus info: pci@0000:00:18.4
          version: 00
          width: 32 bits
          clock: 33MHz
          configuration: driver=fam15h_power
          resources: irq:0
     *-pci:9
          description: Host bridge
          product: Stoney NB Performance Monitor
          vendor: Advanced Micro Devices, Inc. [AMD]
          physical id: 109
          bus info: pci@0000:00:18.5
          version: 00
          width: 32 bits
          clock: 33MHz
     *-pnp00:00
          product: PnP device PNP0c02
          physical id: 1
          capabilities: pnp
          configuration: driver=system
     *-pnp00:01
          product: PnP device HPQ8001
          physical id: 2
          capabilities: pnp
          configuration: driver=i8042 kbd
     *-pnp00:02
          product: PnP device SYN327b
          physical id: 3
          capabilities: pnp
          configuration: driver=i8042 aux
     *-pnp00:03
          product: PnP device PNP0c02
          physical id: 5
          capabilities: pnp
          configuration: driver=system
     *-pnp00:04
          product: PnP device PNP0c01
          physical id: 6
          capabilities: pnp
          configuration: driver=system
     *-scsi:0
          physical id: 7
          logical name: scsi0
          capabilities: emulated
        *-disk
             description: ATA Disk
             product: SAMSUNG MZNLN256
             physical id: 0.0.0
             bus info: scsi@0:0.0.0
             logical name: /dev/sda
             version: 4H3Q
             serial: S3T6NX0M717273
             size: 238GiB (256GB)
             capabilities: gpt-1.00 partitioned partitioned:gpt
             configuration: ansiversion=5 guid=d1975cbf-a885-ed42-9c26-d3d07f4cf49b logicalsectorsize=512 sectorsize=4096
           *-volume:0 UNCLAIMED
                description: Windows FAT volume
                vendor: mkfs.fat
                physical id: 1
                bus info: scsi@0:0.0.0,1
                version: FAT32
                serial: d739-dff2
                size: 297MiB
                capacity: 299MiB
                capabilities: boot fat initialized
                configuration: FATs=2 filesystem=fat
           *-volume:1
                description: EXT4 volume
                vendor: Linux
                physical id: 2
                bus info: scsi@0:0.0.0,2
                logical name: /dev/sda2
                logical name: /
                version: 1.0
                serial: 81aaefa0-8b6b-4e5b-b84a-64957796154f
                size: 238GiB
                capacity: 238GiB
                capabilities: journaled extended_attributes large_files huge_files dir_nlink recover 64bit extents ext4 ext2 initialized
                configuration: created=2021-12-19 17:27:35 filesystem=ext4 lastmountpoint=/ modified=2022-01-02 12:59:48 mount.fstype=ext4 mount.options=rw,relatime,discard mounted=2022-01-02 12:59:49 state=mounted
     *-scsi:1
          physical id: 8
          logical name: scsi1
          capabilities: emulated
        *-cdrom
             description: DVD-RAM writer
             product: DVDRW GUE1N
             vendor: hp
             physical id: 0.0.0
             bus info: scsi@1:0.0.0
             logical name: /dev/cdrom
             logical name: /dev/cdrw
             logical name: /dev/dvd
             logical name: /dev/dvdrw
             logical name: /dev/sr0
             version: UE01
             capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
             configuration: ansiversion=5 status=nodisc
  *-battery
       product: HT03041
       vendor: 333-54-5D-A
       physical id: 1
       version: <null string>
       serial: <null string>
       slot: Primary
       capacity: 41753mWh
       configuration: voltage=11,6V

Until running kernel version 5.11.0-27 on Lubuntu 20.04.3 the system would shutdown and reboot normally. After upgrade to version 5.11.0-43 the system won't do either. If trying a reboot the machine would freeze with a blank screen and when trying to shutdown the machine would freeze on a blank screen as well and needs me to turn it off by holding the power button. Using kernel 5.11.0-27 and 5.04.0-91 the bug does not occur.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.11.0-43-generic 5.11.0-43.47~20.04.2
ProcVersionSignature: Ubuntu 5.11.0-43.47~20.04.2-generic 5.11.22
Uname: Linux 5.11.0-43-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: LXQt
Date: Sun Jan 2 13:42:42 2022
InstallationDate: Installed on 2021-12-19 (13 days ago)
InstallationMedia: Lubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
SourcePackage: linux-signed-hwe-5.11
UpgradeStatus: No upgrade log present (probably fresh install)