我有一台笔记本电脑，运行 Ubuntu 18.04 已经有一段时间了，它有一个内置的网络摄像头，一直以来都运行良好。几个月来我都没有用过相机，今天当我启动 OBS 时，图像最初显示正常，但几秒钟后就变得非常暗和粗糙，好像应用了滤镜一样。奶酪看起来也一样。我尝试过重新启动、重新加载 uvcvideo 模块、调整 guvcview 中的设置以及通过其他几个工具，但它看起来到处都一样，而且实际上没有什么可以修复它。我唯一看到变化的时候是当我关闭“曝光，自动优先”并重新打开时 - 它会淡出到正常视图，但一两秒后又变暗了。
我想不出我最近做了什么更改会导致这种情况，所以我猜是最近更新了一些东西，搞乱了它，但到目前为止，在网上搜索还没有找到任何线索，不知道那是什么或如何修复它。我很感激任何见解。
lsusb输出：
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 1e7d:2cee ROCCAT
Bus 001 Device 004: ID 8087:0025 Intel Corp.
Bus 001 Device 006: ID 04f2:b649 Chicony Electronics Co., Ltd
Bus 001 Device 002: ID 0d8c:0005 C-Media Electronics, Inc.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
sudo lsmod | grep video输出：
uvcvideo 86016 0
videobuf2_vmalloc 16384 1 uvcvideo
videobuf2_memops 16384 1 videobuf2_vmalloc
videobuf2_v4l2 24576 1 uvcvideo
videobuf2_core 40960 2 videobuf2_v4l2,uvcvideo
videodev 184320 3 videobuf2_core,videobuf2_v4l2,uvcvideo
media 40960 2 videodev,uvcvideo
video 45056 1 i915
编辑：发布此帖后，我立即将笔记本电脑移到另一个房间并重新启动 guvcview... 问题就解决了。我感到很困惑，因为我所做的唯一一件事就是运行上述命令... 这里还有一些输出，这次来自dmesg | grep video，为简洁起见，重复的消息被删减了：
[ 3.977130] Linux video capture interface: v2.00
[ 4.028284] uvcvideo: Found UVC 1.00 device Chicony USB2.0 Camera (04f2:b649)
[ 4.032604] uvcvideo 1-4:1.0: Entity type for entity Extension 3 was not initialized!
[ 4.032607] uvcvideo 1-4:1.0: Entity type for entity Processing 2 was not initialized!
[ 4.032608] uvcvideo 1-4:1.0: Entity type for entity Camera 1 was not initialized!
[ 4.032916] usbcore: registered new interface driver uvcvideo
[ 825.512696] uvcvideo: Failed to query (SET_CUR) UVC control 10 on unit 2: -32 (exp. 2).
[ 825.516505] uvcvideo: Failed to query (SET_CUR) UVC control 10 on unit 2: -32 (exp. 2).
...
[ 896.441307] uvcvideo: Failed to query (SET_CUR) UVC control 10 on unit 2: -32 (exp. 2).
[ 896.445849] uvcvideo: Failed to query (SET_CUR) UVC control 10 on unit 2: -32 (exp. 2).
[ 1575.232905] uvcvideo: Failed to resubmit video URB (-19).
[ 1575.236928] uvcvideo: Failed to resubmit video URB (-19).
[ 1575.240902] uvcvideo: Failed to resubmit video URB (-19).
[ 1575.244903] uvcvideo: Failed to resubmit video URB (-19).
[ 1575.248904] uvcvideo: Failed to resubmit video URB (-19).
[ 1612.760969] uvcvideo: Found UVC 1.00 device Chicony USB2.0 Camera (04f2:b649)
[ 1612.765552] uvcvideo 1-4:1.0: Entity type for entity Extension 3 was not initialized!
[ 1612.765558] uvcvideo 1-4:1.0: Entity type for entity Processing 2 was not initialized!
[ 1612.765561] uvcvideo 1-4:1.0: Entity type for entity Camera 1 was not initialized!
[ 2804.103537] uvcvideo: Failed to query (SET_CUR) UVC control 10 on unit 2: -32 (exp. 2).
[ 2804.106589] uvcvideo: Failed to query (SET_CUR) UVC control 10 on unit 2: -32 (exp. 2).
...
[ 3024.013832] uvcvideo: Failed to query (SET_CUR) UVC control 10 on unit 2: -32 (exp. 2).
[ 3086.971099] uvcvideo: Failed to query (SET_CUR) UVC control 10 on unit 2: -32 (exp. 2).
[ 3705.754061] usbcore: deregistering interface driver uvcvideo
[ 3705.842181] uvcvideo: Found UVC 1.00 device Chicony USB2.0 Camera (04f2:b649)
[ 3705.846558] uvcvideo 1-4:1.0: Entity type for entity Extension 3 was not initialized!
[ 3705.846559] uvcvideo 1-4:1.0: Entity type for entity Processing 2 was not initialized!
[ 3705.846560] uvcvideo 1-4:1.0: Entity type for entity Camera 1 was not initialized!
[ 3705.846791] usbcore: registered new interface driver uvcvideo
我仍然不明白到底发生了什么，以及将来如何避免这个问题。