有一段时间，我的麦克风无法工作，但我的网络摄像头可以工作。现在我遇到了相反的问题。显然，尝试对其他用户有效的解决方案不会解决问题，因为我已经尝试了各种线程上建议的随机解决方案，使我的 Dell Precision M6800 变得更糟（它不再可靠地从挂起状态唤醒，而是有时会重新启动）。Ubuntu 16.04 LTS 在我的计算机上非常稳定，但自从 18.04 LTS 首次发布以来，我遇到了许多问题。我的机器在经过大约六个月的更新后终于开始顺利运行，并且稳定了一段时间，直到大约六个月前，事情又开始出错了。无论如何，我很沮丧，真的需要一些更专业的帮助来让事情重新正常运转（如果不是硬件故障，我对此表示怀疑）。由于我对 Ubuntu 不太熟悉，我希望得到一些建议命令的背景/解释，以便我将来可以更好地进行故障排除。据我所知，提供以下输出应该是一个好的开始ls -ltrh /dev/video*：
ls: cannot access '/dev/video*': No such file or directory
输出getfacl /dev/video：
getfacl: /dev/video: No such file or directory
输出ls -ltrh /dev/video*：
ls: cannot access '/dev/video*': No such file or directory
输出lsusb：
Bus 002 Device 004: ID 0a5c:5800 Broadcom Corp. BCM5880 Secure Applications Processor
Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 001 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
输出v4l2-ctl --list-devices：
Failed to open /dev/video0: No such file or directory
最后输出lspci：
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller (rev 06)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-LM (rev 04)
00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d4)
00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 (rev d4)
00:1c.3 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #4 (rev d4)
00:1c.4 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #5 (rev d4)
00:1c.6 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #7 (rev d4)
00:1c.7 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #8 (rev d4)
00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation QM87 Express LPC Controller (rev 04)
00:1f.2 RAID bus controller: Intel Corporation 82801 Mobile SATA Controller [RAID mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 04)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Saturn XT [FirePro M6100] (rev ff)
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Tobago HDMI Audio [Radeon R7 360 / R9 360 OEM] (rev ff)
03:00.0 Network controller: Intel Corporation Wireless 7260 (rev bb)
11:00.0 SD Host controller: O2 Micro, Inc. SD/MMC Card Reader Controller (rev 01)
我不知道这些命令的大多数细节是什么，但我尝试查看所有适用的线程以查找相关的诊断命令。如果我遗漏了任何可能重要的内容，请告诉我。
编辑：我的麦克风被 Ubuntu 检测到但实际上也不起作用。