相机显示“未找到设备”

Question

我在 HP Elitebook 840 G4 上安装了 Ubuntu 20.04。几个月来，当我打开 Cheese 时，相机显示“未找到设备”。以前它工作正常。我甚至无法使用任何 Web 应用程序访问相机。我不确定这是硬件问题还是软件问题。可能是什么问题？

~$ sudo lshw --class video
Hardware Lister (lshw) - 
usage: lshw [-format] [-options ...]
       lshw -version

    -version        print program version ()

format can be
    -html           output hardware tree as HTML
    -xml            output hardware tree as XML
    -json           output hardware tree as a JSON object
    -short          output hardware paths
    -businfo        output bus information

options can be
    -class CLASS    only show a certain class of hardware
    -C CLASS        same as '-class CLASS'
    -c CLASS        same as '-class CLASS'
    -disable TEST   disable a test (like pci, isapnp, cpuid, etc. )
    -enable TEST    enable a test (like pci, isapnp, cpuid, etc. )
    -quiet          don't display status
    -sanitize       sanitize output (remove sensitive information like serial numbers, etc.)
    -numeric        output numeric IDs (for PCI, USB, etc.)
    -notime         exclude volatile attributes (timestamps) from output

:~$ /bin/ls -l /dev/video*;id
/bin/ls: cannot access '/dev/video*': No such file or directory
uid=1000(username) gid=1000(username) groups=1000(username),4(adm),20(dialout),24(cdrom),27(sudo),30(dip),46(plugdev),120(lpadmin),131(lxd),132(sambashare),138(libvirt)