[Bug 213967] New: Thinkpad T14 Chicony Webcam not recognized by kernel

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=213967

            Bug ID: 213967
           Summary: Thinkpad T14 Chicony Webcam not recognized by kernel
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.13.6
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: dev@horatiuion.com
        Regression: No

Distro: Arch Linux


Timeline:

- after upgrading from 5.12.15 to 5.13.4, my webcam wasn't being recognized by
the kernel (nothing showing up in the kernel logs regarding uvcvideo and
nothing showing up in lsusb)
- a temporary fix (as determined by the distro community) was to install the
firmware from this repository
(https://github.com/denisandroid/uPD72020x-Firmware) while waiting for the
official fix
- the potential fix was issued (commit
44cf53602f5a0db80d53c8fff6cdbcae59650a42) and merged in 5.13.6
- after upgrading to 5.13.6 my webcam stopped working yet again. Suspecting
that I no longer needed the uPD72020x-Firmware, I uninstalled it, with no
success. My webcam is still not being recognized


Right now I'm running 5.13.5 with uPD72020x-Firmware installed, which is the
only working solution for now.


Kernel logs:
```
kernel: usb 2-2: new high-speed USB device number 2 using xhci_hcd
kernel: usb 2-2: New USB device found, idVendor=04f2, idProduct=b6d0,
bcdDevice=58.18
kernel: usb 2-2: New USB device strings: Mfr=3, Product=1, SerialNumber=2
kernel: usb 2-2: Product: Integrated Camera
kernel: usb 2-2: Manufacturer: Chicony Electronics Co.,Ltd.
kernel: usb 2-2: SerialNumber: 0001
kernel: usb 2-2: Found UVC 1.10 device Integrated Camera (04f2:b6d0)
kernel: input: Integrated Camera: Integrated C as
/devices/pci0000:00/0000:00:02.7/0000:06:00.0/usb2/2-2/2-2:1.0/input/input30
kernel: usbcore: registered new interface driver btusb
kernel: usb 2-2: Found UVC 1.50 device Integrated Camera (04f2:b6d0)
kernel: input: Integrated Camera: Integrated I as
/devices/pci0000:00/0000:00:02.7/0000:06:00.0/usb2/2-2/2-2:1.2/input/input31
kernel: usbcore: registered new interface driver uvcvideo
```

lsusb:
```
Bus 007 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 006 Device 003: ID 8087:0029 Intel Corp. AX200 Bluetooth
Bus 006 Device 002: ID 06cb:00bd Synaptics, Inc. Prometheus MIS Touch
Fingerprint Reader
Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 004: ID 05e3:0749 Genesys Logic, Inc. SD Card Reader and Writer
Bus 005 Device 005: ID 2109:0812 VIA Labs, Inc. VL812 Hub
Bus 005 Device 006: ID 0bda:8153 Realtek Semiconductor Corp. RTL8153 Gigabit
Ethernet Adapter
Bus 005 Device 003: ID 0bda:0411 Realtek Semiconductor Corp. Hub
Bus 005 Device 002: ID 2109:0817 VIA Labs, Inc. USB3.0 Hub             
Bus 005 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 004 Device 003: ID 058f:9540 Alcor Micro Corp. AU9540 Smartcard Reader
Bus 004 Device 007: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 004 Device 008: ID 24f0:0140 Metadot Das Keyboard 4
Bus 004 Device 006: ID 2109:2812 VIA Labs, Inc. VL812 Hub
Bus 004 Device 005: ID 0bda:5411 Realtek Semiconductor Corp. RTS5411 Hub
Bus 004 Device 004: ID 2109:0102 VIA Labs, Inc. USB 2.0 BILLBOARD             
Bus 004 Device 002: ID 2109:2817 VIA Labs, Inc. USB2.0 Hub             
Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 002 Device 002: ID 04f2:b6d0 Chicony Electronics Co., Ltd Integrated Camera
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
```

I have tried grepping the kernel logs for the pci bridge in the working and
non-working versions

Working:
```
kernel: pci 0000:00:02.7: [1022:1634] type 01 class 0x060400
kernel: pci 0000:00:02.7: PME# supported from D0 D3hot D3cold
kernel: pci 0000:00:02.7: PCI bridge to [bus 06]
kernel: pci 0000:00:02.7:   bridge window [mem 0xfd400000-0xfd4fffff]
kernel: pci 0000:00:02.7: PCI bridge to [bus 06]
kernel: pci 0000:00:02.7:   bridge window [mem 0xfd400000-0xfd4fffff]
kernel: pci 0000:00:02.7: Adding to iommu group 7
kernel: pcieport 0000:00:02.7: PME: Signaling with IRQ 31
kernel: input: Integrated Camera: Integrated C as
/devices/pci0000:00/0000:00:02.7/0000:06:00.0/usb2/2-2/2-2:1.0/input/input30
kernel: input: Integrated Camera: Integrated I as
/devices/pci0000:00/0000:00:02.7/0000:06:00.0/usb2/2-2/2-2:1.2/input/input31
```

Not working:
```
kernel: pci 0000:00:02.7: [1022:1634] type 01 class 0x060400
kernel: pci 0000:00:02.7: PME# supported from D0 D3hot D3cold
kernel: pci 0000:00:02.7: PCI bridge to [bus 06]
kernel: pci 0000:00:02.7:   bridge window [mem 0xfd400000-0xfd4fffff]
kernel: pci 0000:00:02.7: PCI bridge to [bus 06]
kernel: pci 0000:00:02.7:   bridge window [mem 0xfd400000-0xfd4fffff]
kernel: pci 0000:00:02.7: Adding to iommu group 7
kernel: pcieport 0000:00:02.7: PME: Signaling with IRQ 31
```

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