Public bug reported:

After a fresh installation of Xubuntu 26.04 on ThinkPad X1 Carbon Gen
14, the webcam does not function. A test at https://webcamtests.com/
shows that

```
Could not find a web camera, however there are other media devices (like 
speakers or microphones). Most likely, this means that your webcam is not 
working properly or your browser cannot access it.

NotFoundError: Requested device not found; Object
```

A screenshot is attached for reference.

The outputs of `lspci` and `lsusb` commands are as follows:

```
$ lspci
00:00.0 Host bridge: Intel Corporation Device b001 (rev 04)
00:02.0 VGA compatible controller: Intel Corporation Panther Lake [Arc B390] 
(rev 04)
00:04.0 Signal processing controller: Intel Corporation Panther Lake Innovation 
Platform Framework Processor Participant (rev 04)
00:05.0 Multimedia controller: Intel Corporation Panther Lake IPU (rev 04)
00:06.0 PCI bridge: Intel Corporation Device e461 (rev 01)
00:07.0 PCI bridge: Intel Corporation Device e44e
00:07.2 PCI bridge: Intel Corporation Device e460
00:07.3 PCI bridge: Intel Corporation Device e437
00:0a.0 Signal processing controller: Intel Corporation Panther Lake Platform 
Monitoring Technology (PMT) (rev 04)
00:0b.0 Processing accelerators: Intel Corporation Panther Lake NPU (rev 04)
00:0d.0 USB controller: Intel Corporation Device e431
00:0d.2 USB controller: Intel Corporation Device e433
00:0d.3 USB controller: Intel Corporation Device e434
00:12.0 Serial controller: Intel Corporation Device e445 (rev 01)
00:14.0 USB controller: Intel Corporation Device e47d (rev 01)
00:14.2 RAM memory: Intel Corporation Device e47f (rev 01)
00:14.3 Network controller: Intel Corporation Device e440 (rev 01)
00:14.7 Bluetooth: Intel Corporation Device e476 (rev 01)
00:15.0 Serial bus controller: Intel Corporation Device e478 (rev 01)
00:15.1 Serial bus controller: Intel Corporation Device e479 (rev 01)
00:16.0 Communication controller: Intel Corporation Device e470 (rev 01)
00:18.0 Communication controller: Intel Corporation Device e45d (rev 01)
00:19.0 Serial bus controller: Intel Corporation Device e450 (rev 01)
00:19.1 Serial bus controller: Intel Corporation Device e451 (rev 01)
00:1f.0 ISA bridge: Intel Corporation Device e402 (rev 01)
00:1f.3 Audio device: Intel Corporation Device e428 (rev 01)
00:1f.4 SMBus: Intel Corporation Device e422 (rev 01)
00:1f.5 Serial bus controller: Intel Corporation Device e423 (rev 01)
04:00.0 Non-Volatile memory controller: Micron Technology Inc 4600 NVMe SSD 
(rev 01)

$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 2c7c:0310 Quectel Wireless Solutions Co., Ltd. Quectel 
EM05-CN
Bus 003 Device 003: ID 27c6:659c Shenzhen Goodix Technology Co.,Ltd. Goodix 
USB2.0 MISC
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
```

ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: alsa-base 1.0.25+dfsg-0ubuntu9
ProcVersionSignature: Ubuntu 7.0.0-22.22-generic 7.0.0
Uname: Linux 7.0.0-22-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  zaikunzhang   2481 F.... pipewire
                      zaikunzhang   2503 F.... wireplumber
 /dev/snd/seq:        zaikunzhang   2481 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: XFCE
Date: Mon Jun 15 00:08:59 2026
InstallationDate: Installed on 2026-06-11 (3 days ago)
InstallationMedia: Xubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: LENOVO 21V7001BCD
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/14/2026
dmi.bios.release: 1.12
dmi.bios.vendor: LENOVO
dmi.bios.version: N4OET49W (1.12 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21V7001BCD
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76576 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.9
dmi.modalias: 
dmi:bvnLENOVO:bvrN4OET49W(1.12):bd05/14/2026:br1.12:efr1.9:svnLENOVO:pn21V7001BCD:pvrThinkPadX1CarbonGen14:rvnLENOVO:rn21V7001BCD:rvrSDK0T76576WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21V7_BU_Think_FM_ThinkPadX1CarbonGen14:pfaThinkPadX1CarbonGen14:
dmi.product.family: ThinkPad X1 Carbon Gen 14
dmi.product.name: 21V7001BCD
dmi.product.sku: LENOVO_MT_21V7_BU_Think_FM_ThinkPad X1 Carbon Gen 14
dmi.product.version: ThinkPad X1 Carbon Gen 14
dmi.sys.vendor: LENOVO
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2026-06-11T23:53:25.761576

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug resolute

** Attachment added: "webcamtests.png"
   
https://bugs.launchpad.net/bugs/2156710/+attachment/5977384/+files/webcamtests.png

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https://bugs.launchpad.net/bugs/2156710

Title:
  Webcam does not work on ThinkPad X1 Carbon Gen 14 with Xubuntu 26.04

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