NVIDIA JetPack 5.1正式发行版开放下载，这些细节需要注意

JetPack 5.1 是一个生产版本，增加了对 Jetson Orin NX 16GB 生产模块的支持。它还支持 Jetson AGX Orin 32GB、Jetson AGX Orin 开发者套件、Jetson AGX Xavier 系列、Jetson Xavier NX 系列以及 Jetson AGX Xavier 开发者套件和 Jetson Xavier NX 开发者套件。（注意看清楚，Jetson NANO，Jetson TX2NX是不支持的！！）

JetPack 5.1 包括 Jetson Linux 35.2.1，具有新的安全和 OTA 功能以及多媒体、相机和显示器的增强功能。其软件栈包括：

• Jetson Linux 35.2.1
• CUDA 11.4.19
• TensorRT 8.5.2
• cuDNN 8.6.0
• VPI 2.2
• OpenCV 4.5.4
• Vulkan 1.3
• Nsight Systems 2022.5
• Nsight Graphics 2022.6
• Nsight DLD/Compute 2022.2

NVIDIA关于JetPack 5.1版本的介绍都在这里下载：https://docs.nvidia.com/jetson/archives/r35.2.1/ReleaseNotes/Jetson_Linux_Release_Notes_r35.2.1.pdf

建议阅读一下这个文档，里面列举出了不少需要注意的地方，比如：

01

Debian based OTA update on Jetson AGX Orin to 35.2.1/ JP 5.1 will fail on installations that werenotreflashed with 35.1 / JP 5.0.2 release with the following error:

ERROR. Procedure for A_kernel-dtb update FAILED.

意思说：字面意思是从JP 5.0.2（35.1）OTA升级到 JP 5.1（35.2.1）会出现问题。不是JP 5.1自身有问题。这问题会出现在前者也是OTA升级而来的情况下（从34.1升级）的情况下。也就是说，如果你的系统是从34.1 -> 35.1 -> 35.2.1这样OTA升级的话， 会出现问题。

但是，直接把35.1的系统刷到35.2.1，不会有问题。

02

If a Jetson device does not have Internet access by using a connected LAN cable, the OEM configuration screen will take about 4 minutes to display at first boot. We suggest that you connect the LAN cable with Internet access to the Jetson device at first boot, which will shorten the waiting time for the OEM configuration screen

刷机过程中的第一次重启后，如果Jetson无网，则需要等待4分钟这么久，那个初始配置画面才能出现（让你接受授权、配置用户名密码啥的那个）,可以接上一根网线，加速这个画面的出现。

03

After a system suspend and resume, the CPU power at OSidle might increase slightly, which causes the nvpmodel service on Jetson Orin NX to turn off CPU cores in some power modes to fit the power budget. This is a known issue and will be fixed in a future release.

系统休眠然后恢复后，OS空闲状态下的功耗会上升，从而在一些特定的nvpmodel设定的CPU功耗模式下，Jetson Orin NX上会被迫关闭一些CPU核心，来控制功率上限。这是一个已知问题，将在将来的版本中修复。

所以Lady的建议是：总是关机然后用的时候重启就是了

04

Sometimes after flashing Jetson Orin NX in headless mode, ACM port does not show up, which prevents the OEM configuration

如果在不给jetson接显示器的情况下刷机，则有时候刷机后，USB CDC串口设备不出现，从而无法通过串口显示和完成OEM配置画面。

注意：NVIDIA这里说是”有时候“会发生这个情况，Lady的建议说，新手还是接个显示器吧，别给自己整活儿啦....

05

UPHY-2 Lane 1 C9 controller is not working. This will be fixed by JetPack 5.1.1

此处有bug，会在JetPack 5.1.1中修复

06

The Video_dec_drm sample compilation becomes stuck and displays a blank screen when it is run on Jetson AGX Xavier connected to Acer X27 - 4k60 monitor。

当Jetson AGX Xavier接Acer X27 - 4k60 显示器，编译Video_dec_drm 范例时候，会卡住，并出现白屏。

Lady想法：稳定的重要应用程序建议在传统的X11下执行，不要直接使用DRM。

07

The minimum recommended SD card size for flashing the complete JetPack SDK to an SD card for Jetson Xavier NX Developer Kit is 64

建议把JetPack刷到Jetson Xavier NX开发套件的SD卡上时，SD卡的容量至少是64G

08

A complete JetPack installation on the Jetson Xavier NX production module on the 16GB EMMC fails.

Workaround :

Starting with release 35.1, the SDK Manager offers the following options:

● A complete JetPack installation.

● An installation of only the JetPack runtime components The JetPack runtime installation does not include samples and documentation and is helpful for Jetson modules with limited storage and during production

在Jetson Xavier NX 模组16G eMMC上刷完整的JetPack遇到失败，解决的办法是，从35.1版本起，SDK Manger提供了两种选择：

（1）全部安装。

（2）只安装必要组件(JetPack Runtime)，将不包含例子和文档，这样有助于在模组有限的存储空间里进行刷机

09

Running Jetson-io tool over command line on Jetson AGX Orin does not show an option to configure compatible hardware for "Configure Jetson AGX CSI Connector" option. This issue will be fixed as a follow up debian up

在Jetson AGX Orin上通过命令行运行Jetson io工具，在“configure Jetson AGX-CSI Connector”选项中不会显示配置兼容硬件的选项。此问题将在以后的版本里解决。

10

In Jetson AGX Industrial boards with IMX185, the sensor may stop streaming at times through argus when sensor mode is set to 0. However, the sensor works through the v4l2 interface.

在带有IMX185的Jetson AGX工业板中，当传感器模式设置为0时，传感器可能会停止通过argus传输数据。然而，传感器可以通过v4l2接口工作。

11

By default, the IMX185 camera module has apca9570GPIO expander that sets the daymode. If you do not enable the expander, the IR cut filter in the sensor is disabled, and daylight preview might have a pinkish .

IMX185摄像头模块，默认通过自带的PCA9570 GPIO扩展芯片来控制日光模式。如果你没有启动PCA9570，则自带的红线线滤光器会被禁用，这将可能会导致日光下预览画面有点变得偏粉色。

To enable the expander, run the following command:

$ sudo modprobe pca9570

12

A long duration test with detectnet-camera on Jetson Xavier NX might lead to an Out of memory error after three days

如果在NX上长期的运行，GitHub上的jetson-inference/detectnet-camera代码，持续运行3天后将导致内存耗尽错误。（这有点奇葩）

13

In camera preview pipelines (nvarguscamerasrc + nv3dsink), to provide enough buffering for streaming usecases, use the queue element

Here is a sample pipeline

$ gst-launch-1.0 nvarguscamerasrc !
"video/x-raw(memory:NVMM),width=(int)3840,height=(int)2160,f
ramerate=(fraction)60/1" ! queue ! nv3dsink -e

通过nvarguscamerasrc + nv3dsink的相机预览pipeline, 要想为串流用例提供足够的缓冲量, 则应添加DeepStream中的queue element.

14

If you installed CUDA 11.4.14 from JP 5.0.1 DP and earlier releases, the apt upgrade to JP 5.0 GA will fail. This occurs because in the JP 5.0 GA release, the cuda-nvprof-11-4 package has been renamed.

如果你在JP 5.0.1开发预览版，或者更早版本的系统上，安装过CUDA 11.4.14, 则通过apt upgrade命令来更新到JP 5.0正式版将会失败。这是因为JP 5.0正式版中的cuda-nvprof-11.4包，已经被改成了其他名字了。

After the apt upgrade, to fix this issue, run the following command:

$ sudo apt install --fix-broken -o Dpkg::Options::=”--force-overwrite”

（Lady：所以别自动更新了，直接刷机解千愁，记得先把数据备份好）