My camera used to work but now after upgrading to 20.04.3 it stopped working. The following is the dmesg output.
[ 0.000000] microcode: microcode updated early to revision 0xea, date = 2021-01-05
[ 0.000000] Linux version 5.4.0-89-generic (buildd@lgw01-amd64-044) (gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)) #100-Ubuntu SMP Fri Sep 24 14:50:10 UTC 2021 (Ubuntu 5.4.0-89.100-generic 5.4.143)
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-5.4.0-89-generic root=UUID=2134fe71-65b3-4c8b-b426-5eb812a028ed ro iommu=soft quite splash nomodoset vt.handoff=1
[ 0.000000] KERNEL supported cpus:
[ 0.000000] Intel GenuineIntel
[ 0.000000] AMD AuthenticAMD
[ 0.000000] Hygon HygonGenuine
[ 0.000000] Centaur CentaurHauls
[ 0.000000] zhaoxin Shanghai
[ 0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
[ 0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
[ 0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
[ 0.000000] x86/fpu: Supporting XSAVE feature 0x008: 'MPX bounds registers'
[ 0.000000] x86/fpu: Supporting XSAVE feature 0x010: 'MPX CSR'
[ 0.000000] x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256
[ 0.000000] x86/fpu: xstate_offset[3]: 832, xstate_sizes[3]: 64
[ 0.000000] x86/fpu: xstate_offset[4]: 896, xstate_sizes[4]: 64
[ 0.000000] x86/fpu: Enabled xstate features 0x1f, context size is 960 bytes, using 'compacted' format.
[ 0.000000] BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009efff] usable
[ 0.000000] BIOS-e820: [mem 0x000000000009f000-0x00000000000fffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007f747fff] usable
[ 0.000000] BIOS-e820: [mem 0x000000007f748000-0x0000000080047fff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000080048000-0x000000008e25dfff] usable
[ 0.000000] BIOS-e820: [mem 0x000000008e25e000-0x000000008f4ddfff] reserved
[ 0.000000] BIOS-e820: [mem 0x000000008f4de000-0x000000008fbcdfff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x000000008fbce000-0x000000008fc4dfff] ACPI data
[ 0.000000] BIOS-e820: [mem 0x000000008fc4e000-0x000000008fc4efff] usable
[ 0.000000] BIOS-e820: [mem 0x000000008fc4f000-0x000000009d7fffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000e0000000-0x00000000efffffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fe000000-0x00000000fe010fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fed10000-0x00000000fed19fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fed84000-0x00000000fed84fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000ff500000-0x00000000ffffffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x00000005607fffff] usable
[ 0.000000] NX (Execute Disable) protection: active
[ 0.000000] e820: update [mem 0x7bad7018-0x7bae7057] usable ==> usable
[ 0.000000] e820: update [mem 0x7bad7018-0x7bae7057] usable ==> usable
[ 0.000000] e820: update [mem 0x7baaa018-0x7bad6657] usable ==> usable
[ 0.000000] e820: update [mem 0x7baaa018-0x7bad6657] usable ==> usable
[ 0.000000] extended physical RAM map:
[ 0.000000] reserve setup_data: [mem 0x0000000000000000-0x000000000009efff] usable
[ 0.000000] reserve setup_data: [mem 0x000000000009f000-0x00000000000fffff] reserved
[ 0.000000] reserve setup_data: [mem 0x0000000000100000-0x000000007baaa017] usable
[ 0.000000] reserve setup_data: [mem 0x000000007baaa018-0x000000007bad6657] usable
[ 0.000000] reserve setup_data: [mem 0x000000007bad6658-0x000000007bad7017] usable
[ 0.000000] reserve setup_data: [mem 0x000000007bad7018-0x000000007bae7057] usable
[ 0.000000] reserve setup_data: [mem 0x000000007bae7058-0x000000007f747fff] usable
[ 0.000000] reserve setup_data: [mem 0x000000007f748000-0x0000000080047fff] reserved
[ 0.000000] reserve setup_data: [mem 0x0000000080048000-0x000000008e25dfff] usable
[ 0.000000] reserve setup_data: [mem 0x000000008e25e000-0x000000008f4ddfff] reserved
[ 0.000000] reserve setup_data: [mem 0x000000008f4de000-0x000000008fbcdfff] ACPI NVS
[ 0.000000] reserve setup_data: [mem 0x000000008fbce000-0x000000008fc4dfff] ACPI data
[ 0.000000] reserve setup_data: [mem 0x000000008fc4e000-0x000000008fc4efff] usable
[ 0.000000] reserve setup_data: [mem 0x000000008fc4f000-0x000000009d7fffff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000e0000000-0x00000000efffffff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000fe000000-0x00000000fe010fff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000fed10000-0x00000000fed19fff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000fed84000-0x00000000fed84fff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[ 0.000000] reserve setup_data: [mem 0x00000000ff500000-0x00000000ffffffff] reserved
[ 0.000000] reserve setup_data: [mem 0x0000000100000000-0x00000005607fffff] usable
[ 0.000000] efi: EFI v2.70 by INSYDE Corp.
[ 0.000000] efi: ACPI=0x8fc4d000 ACPI 2.0=0x8fc4d014 TPMFinalLog=0x8fbc5000 SMBIOS=0x8e655000 SMBIOS 3.0=0x8e653000 ESRT=0x7c7e3018 TPMEventLog=0x7bae8018
[ 0.000000] secureboot: Secure boot disabled
[ 0.000000] SMBIOS 3.1.1 present.
[ 0.000000] DMI: LENOVO 81NA/LNVNB161216, BIOS CRCN11WW(V1.03) 11/28/2019
[ 0.000000] tsc: Detected 2300.000 MHz processor
[ 0.000011] tsc: Detected 2299.968 MHz TSC
[ 0.000011] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
[ 0.000013] e820: remove [mem 0x000a0000-0x000fffff] usable
[ 0.000018] last_pfn = 0x560800 max_arch_pfn = 0x400000000
[ 0.000021] MTRR default type: write-back
[ 0.000022] MTRR fixed ranges enabled:
[ 0.000023] 00000-9FFFF write-back
[ 0.000023] A0000-BFFFF uncachable
[ 0.000024] C0000-FFFFF write-protect
[ 0.000024] MTRR variable ranges enabled:
[ 0.000026] 0 base 00C0000000 mask 7FC0000000 uncachable
[ 0.000026] 1 base 00A0000000 mask 7FE0000000 uncachable
[ 0.000027] 2 base 009C000000 mask 7FFC000000 uncachable
[ 0.000027] 3 base 009A000000 mask 7FFE000000 uncachable
[ 0.000028] 4 base 0099000000 mask 7FFF000000 uncachable
[ 0.000029] 5 base 2000000000 mask 6000000000 uncachable
[ 0.000029] 6 base 1000000000 mask 7000000000 uncachable
[ 0.000030] 7 base 0800000000 mask 7800000000 uncachable
[ 0.000030] 8 base 4000000000 mask 4000000000 uncachable
[ 0.000031] 9 disabled
[ 0.000694] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WP UC- WT
[ 0.001180] last_pfn = 0x8fc4f max_arch_pfn = 0x400000000
[ 0.006878] esrt: Reserving ESRT space from 0x000000007c7e3018 to 0x000000007c7e30a0.
[ 0.006881] e820: update [mem 0x7c7e3000-0x7c7e3fff] usable ==> reserved
[ 0.006893] check: Scanning 1 areas for low memory corruption
[ 0.006896] Using GB pages for direct mapping
[ 0.007301] secureboot: Secure boot disabled
[ 0.007302] RAMDISK: [mem 0x3ce58000-0x3fffdfff]
[ 0.007306] ACPI: Early table checksum verification disabled
[ 0.007309] ACPI: RSDP 0x000000008FC4D014 000024 (v02 LENOVO)
[ 0.007312] ACPI: XSDT 0x000000008FC2F188 000104 (v01 LENOVO CB-01 00000001 01000013)
[ 0.007316] ACPI: FACP 0x000000008FC34000 00010C (v05 LENOVO CB-01 00000001 01000013)
[ 0.007320] ACPI: DSDT 0x000000008FBEA000 044294 (v02 LENOVO CB-01 00000001 01000013)
[ 0.007322] ACPI: FACS 0x000000008FB68000 000040
[ 0.007324] ACPI: UEFI 0x000000008FBCD000 000236 (v01 LENOVO CB-01 00000001 ACPI 00040000)
[ 0.007326] ACPI: SSDT 0x000000008FC47000 005A37 (v02 LENOVO CB-01 00000001 INTL 20160422)
[ 0.007328] ACPI: SSDT 0x000000008FC45000 001B4A (v02 LENOVO CB-01 00000001 INTL 20160422)
[ 0.007330] ACPI: SSDT 0x000000008FC44000 0000E6 (v02 LENOVO CB-01 00000001 INTL 20160422)
[ 0.007332] ACPI: SSDT 0x000000008FC40000 0031C6 (v02 LENOVO CB-01 00000001 INTL 20160422)
[ 0.007334] ACPI: SSDT 0x000000008FC3F000 00045A (v02 LENOVO CB-01 00000001 INTL 20160422)
[ 0.007336] ACPI: SSDT 0x000000008FC3E000 000046 (v02 LENOVO CB-01 00000001 INTL 20160422)
[ 0.007338] ACPI: TPM2 0x000000008FC3D000 000034 (v03 LENOVO CB-01 00000001 01000013)
[ 0.007340] ACPI: MSDM 0x000000008FC3C000 000055 (v03 LENOVO CB-01 00000001 ACPI 00040000)
[ 0.007342] ACPI: LPIT 0x000000008FC3B000 000094 (v01 LENOVO CB-01 00000001 01000013)
[ 0.007344] ACPI: WSMT 0x000000008FC3A000 000028 (v01 LENOVO CB-01 00000001 01000013)
[ 0.007346] ACPI: SSDT 0x000000008FC39000 000B70 (v02 LENOVO CB-01 00000001 INTL 20160422)
[ 0.007348] ACPI: DBGP 0x000000008FC38000 000034 (v01 LENOVO CB-01 00000001 ACPI 00040000)
[ 0.007350] ACPI: DBG2 0x000000008FC37000 000054 (v00 LENOVO CB-01 00000001 ACPI 00040000)
[ 0.007352] ACPI: SSDT 0x000000008FC36000 000B9F (v02 LENOVO CB-01 00000001 INTL 20160422)
[ 0.007354] ACPI: NHLT 0x000000008FC35000 00002D (v00 LENOVO CB-01 00000001 01000013)
[ 0.007356] ACPI: HPET 0x000000008FC33000 000038 (v01 LENOVO CB-01 00000001 01000013)
[ 0.007358] ACPI: APIC 0x000000008FC32000 000164 (v03 LENOVO CB-01 00000001 01000013)
[ 0.007359] ACPI: MCFG 0x000000008FC31000 00003C (v01 LENOVO CB-01 00000001 01000013)
[ 0.007361] ACPI: DMAR 0x000000008FC30000 0000A8 (v01 INTEL EDK2 00000002 01000013)
[ 0.007363] ACPI: SSDT 0x000000008FBE7000 002F94 (v01 Insyde NvdTable 00001000 INTL 20160422)
[ 0.007365] ACPI: SSDT 0x000000008FBE6000 000BF8 (v02 SgRef SgRpSsdt 00001000 INTL 20160422)
[ 0.007367] ACPI: SSDT 0x000000008FBE5000 000164 (v01 INSYDE PcdTabl 00001000 INTL 20160422)
[ 0.007369] ACPI: SSDT 0x000000008FBE4000 00005C (v02 Insyde AhciTabl 00001000 INTL 20160527)
[ 0.007371] ACPI: SSDT 0x000000008FBE3000 000819 (v02 Compal CompCMFC 00003000 INTL 20160422)
[ 0.007373] ACPI: FPDT 0x000000008FBE2000 000044 (v01 INSYDE EDK2INTL 00000002 01000013)
[ 0.007375] ACPI: BGRT 0x000000008FBE1000 000038 (v01 INSYDE H2O BIOS 00000001 ACPI 00040000)
[ 729.472824] usb 1-6: USB disconnect, device number 7
[ 729.868858] usb 1-6: new high-speed USB device number 8 using xhci_hcd
[ 730.050848] usb 1-6: New USB device found, idVendor=174f, idProduct=2426, bcdDevice= 1.08
[ 730.050855] usb 1-6: New USB device strings: Mfr=3, Product=1, SerialNumber=2
[ 730.050859] usb 1-6: Product: Integrated Camera
[ 730.050863] usb 1-6: Manufacturer: 201406250001
[ 730.050865] usb 1-6: SerialNumber: 200901010001
[ 730.055049] uvcvideo: Found UVC 1.00 device Integrated Camera (174f:2426)
[ 730.061613] uvcvideo: Failed to initialize entity for entity 6
[ 730.061618] uvcvideo: Failed to register entities (-22).
[ 730.062061] input: Integrated Camera: Integrated C as /devices/pci0000:00/0000:00:14.0/usb1/1-6/1-6:1.0/input/input22
[ 730.895101] usb 1-6: USB disconnect, device number 8
[ 731.309009] usb 1-6: new high-speed USB device number 9 using xhci_hcd
[ 731.490905] usb 1-6: New USB device found, idVendor=174f, idProduct=2426, bcdDevice= 1.08
[ 731.490912] usb 1-6: New USB device strings: Mfr=3, Product=1, SerialNumber=2
[ 731.490916] usb 1-6: Product: Integrated Camera
[ 731.490920] usb 1-6: Manufacturer: 201406250001
[ 731.490923] usb 1-6: SerialNumber: 200901010001
[ 731.495159] uvcvideo: Found UVC 1.00 device Integrated Camera (174f:2426)
[ 731.501218] uvcvideo: Failed to initialize entity for entity 6
[ 731.501221] uvcvideo: Failed to register entities (-22).
[ 731.501596] input: Integrated Camera: Integrated C as /devices/pci0000:00/0000:00:14.0/usb1/1-6/1-6:1.0/input/input23
[ 850.007592] usb 1-6: USB disconnect, device number 9
[ 850.409276] usb 1-6: new high-speed USB device number 10 using xhci_hcd
[ 850.589241] usb 1-6: New USB device found, idVendor=174f, idProduct=2426, bcdDevice= 1.08
[ 850.589248] usb 1-6: New USB device strings: Mfr=3, Product=1, SerialNumber=2
[ 850.589253] usb 1-6: Product: Integrated Camera
[ 850.589257] usb 1-6: Manufacturer: 201406250001
[ 850.589261] usb 1-6: SerialNumber: 200901010001
[ 850.592677] uvcvideo: Found UVC 1.00 device Integrated Camera (174f:2426)
[ 850.597597] uvcvideo: Failed to initialize entity for entity 6
[ 850.597601] uvcvideo: Failed to register entities (-22).
[ 850.597902] input: Integrated Camera: Integrated C as /devices/pci0000:00/0000:00:14.0/usb1/1-6/1-6:1.0/input/input24
[ 851.453732] usb 1-6: USB disconnect, device number 10
[ 851.841282] usb 1-6: new high-speed USB device number 11 using xhci_hcd
[ 852.029421] usb 1-6: New USB device found, idVendor=174f, idProduct=2426, bcdDevice= 1.08
[ 852.029426] usb 1-6: New USB device strings: Mfr=3, Product=1, SerialNumber=2
[ 852.029429] usb 1-6: Product: Integrated Camera
[ 852.029432] usb 1-6: Manufacturer: 201406250001
[ 852.029434] usb 1-6: SerialNumber: 200901010001
[ 852.033034] uvcvideo: Found UVC 1.00 device Integrated Camera (174f:2426)
[ 852.037583] uvcvideo: Failed to initialize entity for entity 6
[ 852.037586] uvcvideo: Failed to register entities (-22).
[ 852.037805] input: Integrated Camera: Integrated C as /devices/pci0000:00/0000:00:14.0/usb1/1-6/1-6:1.0/input/input25
