我有一台 Alienware M17x R3。我最近安装了 Ubuntu 20.04，我知道网络摄像头之前是可以正常工作的。我按下了FN + F9显示为相机键的按钮，但任何应用程序（cheese、zoom 等）都未检测到相机。
我输入lsusb：
Bus 002 Device 006: ID 0955:7002 NVIDIA Corp.
Bus 002 Device 005: ID 187c:0520 Alienware Corporation
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 004 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 001 Device 003: ID 413c:8187 Dell Computer Corp. DW375 Bluetooth Module
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
我输入dmesg：
[ 3786.350637] atkbd serio0: Unknown key pressed (translated set 2, code 0xab on isa0060/serio0).
[ 3786.350645] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 3786.365473] atkbd serio0: Unknown key released (translated set 2, code 0xab on isa0060/serio0).
[ 3786.365479] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 3786.629781] usb 2-1.3: new high-speed USB device number 12 using ehci-pci
[ 3786.662475] usb 2-1.3: config 247 has too many interfaces: 120, using maximum allowed: 32
[ 3786.662482] usb 2-1.3: config 247 descriptor has 1 excess byte, ignoring
[ 3786.662487] usb 2-1.3: config 247 has 0 interfaces, different from the descriptor's value: 120
[ 3786.663978] usb 2-1.3: New USB device found, idVendor=05ca, idProduct=181a, bcdDevice= c.16
[ 3786.663984] usb 2-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 3786.663988] usb 2-1.3: Product: Laptop_Integrated_Webcam_3M
[ 3786.663992] usb 2-1.3: Manufacturer: CN0PYVWX72487114009FA00
[ 3786.664575] usb 2-1.3: can't set config #247, error -32
[ 3788.757961] atkbd serio0: Unknown key pressed (translated set 2, code 0xab on isa0060/serio0).
[ 3788.757969] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 3788.767442] atkbd serio0: Unknown key released (translated set 2, code 0xab on isa0060/serio0).
[ 3788.767448] atkbd serio0: Use 'setkeycodes e02b <keycode>' to make it known.
[ 3788.966649] usb 2-1.3: USB disconnect, device number 12
我输入lspci：
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5)
00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b5)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b5)
00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation HM67 Express Chipset LPC Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port Mobile SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 05)
01:00.0 VGA compatible controller: NVIDIA Corporation GK104M [GeForce GTX 780M] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GK104 HDMI Audio Controller (rev a1)
07:00.0 Ethernet controller: Qualcomm Atheros AR8151 v2.0 Gigabit Ethernet (rev c0)
0d:00.0 Network controller: Broadcom Inc. and subsidiaries BCM4313 802.11bgn Wireless Network Adapter (rev 01)
13:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5209 PCI Express Card Reader (rev 01)
13:00.1 SD Host controller: Realtek Semiconductor Co., Ltd. RTS5209 PCI Express Card Reader (rev 01)
19:00.0 USB controller: NEC Corporation uPD720200 USB 3.0 Host Controller (rev 04)
我从中看到dmesg，按键FN+F9试图激活相机，并且它是 USB（似乎如此），尽管它是“集成”的。但是什么也没发生。正如您所看到的，dmesg它表示设备的 USB 已断开连接。
我无法通过 BIOS 打开它。
我究竟做错了什么？
答案1
我想回答我自己的问题，以帮助遇到此问题的其他人。事实证明，来自的消息dmesg是正确的。它打开了相机，但是当您看到它已通过打开后dmesg，至少对我来说，我不得不重新启动机器。我确信有一个命令可以在不重新启动的情况下在 Ubuntu 上使用相机，但我不知道，也许这里有人可以提供帮助。
无论如何，如果其他人都遇到问题并且无法使用 FN + 相机（对我来说是 F9，有些人是 F10），则在识别后重新启动它dmesg