Dell Latitude 7440/7340在Ubuntu 22.04下集成摄像头无法正常工作的求助

各位大佬好，我在Ubuntu 22.04上使用Dell Latitude 7440/7340时，遇到了集成摄像头无法正常工作的问题。之前看到社区里已有类似提问，但由于声望不够没法在那些帖子下评论，所以特意开新帖求助，希望能和大家一起推进解决这个问题。

摄像头的硬件识别状态 #

我用lshw工具检查时，发现摄像头被归类为multimedia设备而非video设备：

未安装驱动前的识别结果 #

执行命令 sudo lshw -C multimedia，输出如下：

*-multimedia:0 UNCLAIMED
description: Multimedia controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 5
bus info: pci@0000:00:05.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: pciexpress pm cap_list
configuration: latency=0
resources: iomemory:600-5ff memory:6052000000-6052ffffff

安装驱动后的识别结果 #

手动安装IPU6/IPU6EP驱动栈后，再次执行同一命令，输出变为：

*-multimedia:0
description: Multimedia controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 5
bus info: pci@0000:00:05.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: pciexpress pm bus_master cap_list
configuration: driver=intel-ipu6 latency=0
resources: iomemory:600-5ff irq:16 memory:6052000000-6052ffffff

驱动安装步骤 #

我是按照以下步骤手动安装IPU6/IPU6EP驱动栈的：

• 添加PPA源：sudo add-apt-repository ppa:oem-solutions-group/intel-ipu6
• 安装内核模块：sudo apt install linux-modules-ipu6-generic-hwe-22.04 linux-modules-ivsc-generic-hwe-22.04
• 安装相关库文件：sudo apt install libcamhal-ipu6ep0
• 重启系统：sudo reboot

安装完成后，系统中出现了/dev/video设备，执行ls -l /dev/video*的输出如下：

crw-rw----+ 1 root video 81, 0 juni  19 14:24 /dev/video0
crw-rw----  1 root video 81, 1 juni  19 14:24 /dev/video1

之后我还把当前用户加入了video组（我是通过pam_group和/etc/security/groups.conf来配置的）。

当前遇到的问题 #

现在Zoom能够识别到摄像头为「Intel MIPI Camera」，但完全无法显示画面。查看内核日志时发现了报错信息，执行dmesg |grep ipu6得到以下输出：

[    4.449996] intel-ipu6 intel-ipu: enabling device (0000 -> 0002)
[    4.450272] intel-ipu6 intel-ipu: Device 0xa75d (rev: 0x1)
[    4.450295] intel-ipu6 intel-ipu: physical base address 0x6052000000
[    4.450298] intel-ipu6 intel-ipu: mapped as: 0x00000000ba3d362f
[    4.450354] intel-ipu6 intel-ipu: IPU in secure mode
[    4.450355] intel-ipu6 intel-ipu: IPU secure touch = 0x0
[    4.450357] intel-ipu6 intel-ipu: IPU camera mask = 0x0
[    4.466705] intel-ipu6 intel-ipu: IPC reset done
[    4.466710] intel-ipu6 intel-ipu: cpd file name: intel/ipu6ep_fw.bin
[    4.468556] intel-ipu6 intel-ipu: FW version: 20220510
[    4.473948] intel-ipu6 intel-ipu: Found supported sensor INT3537:00
[    4.474049] intel-ipu6 intel-ipu: Connected 1 cameras
[    4.475954] intel-ipu6 intel-ipu: Sending BOOT_LOAD to CSE
[    4.488770] intel-ipu6 intel-ipu: Sending AUTHENTICATE_RUN to CSE
[    4.566919] intel-ipu6 intel-ipu: CSE authenticate_run done
[    4.566963] intel-ipu6 intel-ipu: IPU6-v3 driver version 1.0
[    4.622336] intel-ipu6-psys intel-ipu6-psys0: pkg_dir entry count:8
[    4.622623] intel-ipu6-psys intel-ipu6-psys0: psys probe minor: 0
[   11.923791] intel-ipu6-isys intel-ipu6-isys0: isys port open ready failed -16
[   11.923799] intel-ipu6-isys intel-ipu6-isys0: Device close failure: -16
[   13.925869] intel-ipu6-isys intel-ipu6-isys0: Device release time out -16
[   13.925882] intel-ipu6-isys intel-ipu6-isys0: Clearing old context
[   13.925906] intel-ipu6-isys intel-ipu6-isys0: isys fw com open failed -5
[   14.034750] intel-ipu6-isys intel-ipu6-isys0: bind hi556 15-0020 nlanes is 2 port is 1
[   14.034798] intel-ipu6-isys intel-ipu6-isys0: All sensor registration completed.
[   19.236907] intel-ipu6-isys intel-ipu6-isys0: Clearing old context
[   19.236927] intel-ipu6-isys intel-ipu6-isys0: isys fw com open failed -5

特殊情况说明 #

第一次安装这个PPA里的Intel驱动时，一切都正常——Zoom能正常显示画面，Cheese也能正常工作。但我重装系统后，按照完全相同的步骤操作，却再也没能复现这个成功的结果，现在就卡在了当前的状态。

备注：内容来源于stack exchange，提问作者user112594