webcam is detected but not working

[Afsal Rahman]

My builtin webcam stopped working after a kernel update issued after 22 April 2020 . Before this date i was able to take pictures on cheese and video call etc , and for a while i didn't use my webcam until yesterday i noticed that my webcam is getting detected as "usb 2.0 web camera" but its not working at all . Cheese shows a black screen when opened and Firefox asks for permission and then nothing happens . So i changed the kernel to version to 5.0 from 5.4.0.33 and webcam started working properly .So this issue is caused by a linux kernel update .

output of sudo lshw :

*-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

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Rokk (rocco-pietrini)]

Here my similar problem: https://askubuntu.com/questions/1268740/integrated-webcam-stopped-working-camera-is-working-on-windows