Arch Linux

tuxayo

Member

Registered: 2013-02-26

Posts: 27

[Can't reproduce anymore] Webcam no longer detected

Hi,

One week ago I could use the webcam of my thinkpad T420 and now I can't, Cheese lists no peripherals.

Here is some infos:

lsusb:

Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 010: ID 0a5c:217f Broadcom Corp. BCM2045B (BDC-2.1)
Bus 001 Device 003: ID 147e:2016 Upek Biometric Touchchip/Touchstrip Fingerprint Sensor
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

lspci:

00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:16.3 Serial controller: Intel Corporation 6 Series/C200 Series Chipset Family KT Controller (rev 04)
00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b4)
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b4)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b4)
00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5 (rev b4)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation QM67 Express Chipset Family LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller (rev 04)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 04)
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 34)
0d:00.0 System peripheral: Ricoh Co Ltd PCIe SDXC/MMC Host Controller (rev 08)
0d:00.3 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 PCIe IEEE 1394 Controller (rev 04)

relevant stuff found in dmesg:

[   13.819145] uvcvideo: Found UVC 1.00 device Integrated Camera (04f2:b221)
[   13.820810] uvcvideo 1-1.6:1.0: Entity type for entity Extension 3 was not initialized!
[   13.820815] uvcvideo 1-1.6:1.0: Entity type for entity Processing 2 was not initialized!
[   13.820817] uvcvideo 1-1.6:1.0: Entity type for entity Camera 1 was not initialized!
[   13.820941] input: Integrated Camera as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.6/1-1.6:1.0/input/input18
[   13.821018] usbcore: registered new interface driver uvcvideo
[   13.821019] USB Video Class driver (1.1.1)

What can I do to investigate the issue?

Last edited by tuxayo (2016-06-12 08:41:50)

tuxayo

Member

Registered: 2013-02-26

Posts: 27

Re: [Can't reproduce anymore] Webcam no longer detected

Switching from mainline (4.6.2) to lts kernel (4.4.13) allows me to use my webcam again.

lspci unchanged

lsusb now shows one more line:
Bus 001 Device 005: ID 04f2:b221 Chicony Electronics Co., Ltd integrated camera

dmesg doesn't show anymore the lines complaining about entities not initialized.

[   16.463110] uvcvideo: Found UVC 1.00 device Integrated Camera (04f2:b221)
[   16.465220] input: Integrated Camera as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.6/1-1.6:1.0/input/input18
[   16.465442] usbcore: registered new interface driver uvcvideo
[   16.465448] USB Video Class driver (1.1.1)

R00KIE

Forum Fellow

From: Between a computer and a chair

Registered: 2008-09-14

Posts: 4,734

Re: [Can't reproduce anymore] Webcam no longer detected

I also have a chicony webcam (different model though) in my laptop but it works fine with the latest stable kernel. I have

> dmesg | egrep -i "uvc|camera"
[    7.416660] uvcvideo: Found UVC 1.00 device Integrated Camera (04f2:b541)
[    7.419453] uvcvideo: Failed to initialize entity for entity 6
[    7.419455] uvcvideo: Failed to register entites (-22).
[    7.419524] input: Integrated Camera as /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/input/input16
[    7.419578] usbcore: registered new interface driver uvcvideo

but the webcam works fine with guvcview and skype seems to find the webcam just fine. You could try installing v4l-utils and try 'v4l2-ctl --list-devices' and see if your webcam is listed although not being listen on the output of lsusb point to something else not being ok.

---

R00KIE
Tm90aGluZyB0byBzZWUgaGVyZSwgbW92ZSBhbG9uZy4K

tuxayo

Member

Registered: 2013-02-26

Posts: 27

Re: [Can't reproduce anymore] Webcam no longer detected

I rebooted with the stable kernel and now my webcam is detected again! I don't understand what happened!

When I had the issue, it was a clean session, that is to say, no updated performed since the boot.