lsusb - 我总是无法打开设备。这是正常的吗？

Question

当我写作时，lsusb -v我总是得到"Couldn't open device, some information will be missing"每辆公共汽车的这种情况是否正常？

PS：我试图从通过 USB 连接的激光扫描仪读取数据。但我得到“无法打开串口”。我想检查端口，lsusb我看到每个 USB 端口上都写着“无法打开设备”。即使对于我的鼠标，它也显示“无法打开”，但它正在工作。

Answer 1

是的。您正在询问硬件信息，因此某些信息可能需要 sudo。看看2个之间的区别...

rinzwind@schijfwereld:~$ lsusb -v | grep device
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing
Couldn't open device, some information will be missing

当使用 sudo 时，它会消失，但您会收到其他通知：

rinzwind@schijfwereld:~$ sudo lsusb -v | grep device
can't get debug descriptor: Resource temporarily unavailable
      Lowest fully-functional device speed is SuperSpeed (5Gbps)
can't get debug descriptor: Resource temporarily unavailable
Device Qualifier (for other device speed):
can't get device qualifier: Resource temporarily unavailable
can't get debug descriptor: Resource temporarily unavailable
can't get device qualifier: Resource temporarily unavailable
can't get debug descriptor: Resource temporarily unavailable