Public bug reported:

webcam is detected not working under kernel 5.4.0.33 and 5.4.0.31 . The webcam 
is functional with kernels 5.0 and 5.6.15 .
-usb:1
                      description: Video
                      product: USB 2.0 Web Camera
                      vendor: Alcor Micro, Corp.
                      physical id: 2
                      bus info: usb@1:1.2
                      version: 0.08
                      capabilities: usb-2.00
                      configuration: driver=uvcvideo maxpower=200mA 
speed=480Mbit/s
susb; lsb_release -a; uname -a

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 1d0b:0021 HAN HUA CABLE & WIRE TECHNOLOGY (J.X.) CO., 
LTD.
Bus 001 Device 003: ID 058f:5608 Alcor Micro Corp.
Bus 001 Device 002: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04 LTS
Release: 20.04
Codename: focal
Linux afsal-Excelance 5.4.0-33-generic #37-Ubuntu SMP Thu May 21 12:53:59 UTC 
2020 x86_64 x86_64 x86_64 GNU/Linux


more info : https://answers.launchpad.net/ubuntu/+question/691070

** Affects: linux-signed (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1881757

Title:
  webcam is detected but not working with kernel 5.4.0.33

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