I just format my entire laptop using a bootable USB stick (I do this when my laptop becomes laggy). My webcam was working perfectly fine before that, but after the format, it has stopped working, so I would like to think it isn't a hardware issue. I have no clue how to debug this issue, any help would mean a lot!

On opening cheese, I get a blank dark screen, notice how all buttons are disabled. The flashlight beside my webcam is on.

output of ls /dev/video*

/dev/video0  /dev/video1

output of lsb_release -a

No LSB modules are available.

Distributor ID: Ubuntu

Description:    Ubuntu 20.04.3 LTS

Release:    20.04

Codename:   focal

output of lsusb

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

Bus 001 Device 005: ID 0cf3:e009 Qualcomm Atheros Communications 

Bus 001 Device 004: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller

Bus 001 Device 003: ID 1bcf:0b09 Sunplus Innovation Technology Inc. SPCA2085 PC Camera

Bus 001 Device 002: ID 046d:c534 Logitech, Inc. Unifying Receiver

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

output on running gucview. Again, the flashlight beside my webcam is on.

V4L2_CORE: Unable to find parent usb device.GUVCVIEW: version 2.0.6

V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory

V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory

ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear

ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe

ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side

ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map

ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map

Cannot connect to server socket err = No such file or directory

Cannot connect to server request channel

jack server is not running or cannot be started

JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock

JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock

Cannot connect to server socket err = No such file or directory

Cannot connect to server request channel

jack server is not running or cannot be started

JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock

JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock

ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port

ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port

ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card

ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card

Cannot connect to server socket err = No such file or directory

Cannot connect to server request channel

jack server is not running or cannot be started

JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock

JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock

V4L2_CORE: Could not grab image (select timeout): Resource temporarily unavailable

V4L2_CORE: Could not grab image (select timeout): Resource temporarily unavailable

V4L2_CORE: Could not grab image (select timeout): Resource temporarily unavailable

output of cat /etc/modprobe.d/blacklist.conf

# This file lists those modules which we don't want to be loaded by

# alias expansion, usually so some other driver will be loaded for the

# device instead.



# evbug is a debug tool that should be loaded explicitly

blacklist evbug



# these drivers are very simple, the HID drivers are usually preferred

blacklist usbmouse

blacklist usbkbd



# replaced by e100

blacklist eepro100



# replaced by tulip

blacklist de4x5



# causes no end of confusion by creating unexpected network interfaces

blacklist eth1394



# snd_intel8x0m can interfere with snd_intel8x0, doesn't seem to support much

# hardware on its own (Ubuntu bug #2011, #6810)

blacklist snd_intel8x0m



# Conflicts with dvb driver (which is better for handling this device)

blacklist snd_aw2



# replaced by p54pci

blacklist prism54



# replaced by b43 and ssb.

blacklist bcm43xx



# most apps now use garmin usb driver directly (Ubuntu: #114565)

blacklist garmin_gps



# replaced by asus-laptop (Ubuntu: #184721)

blacklist asus_acpi



# low-quality, just noise when being used for sound playback, causes

# hangs at desktop session start (Ubuntu: #246969)

blacklist snd_pcsp



# ugly and loud noise, getting on everyone's nerves; this should be done by a

# nice pulseaudio bing (Ubuntu: #77010)

blacklist pcspkr



# EDAC driver for amd76x clashes with the agp driver preventing the aperture

# from being initialised (Ubuntu: #297750). Blacklist so that the driver

# continues to build and is installable for the few cases where its

# really needed.

blacklist amd76x_edac