再次关闭一个USB设备... [英] Turning off a single usb device... again
问题描述
我知道这个话题已经讨论了很多次，但是没有一个答案对我有帮助。记录下来，我正在运行Debian。
I know that this topic has been discussed many times, but none of the answers helped me. For the record, i'm running Debian.
交易是：我买了一个USB供电的led灯，它非常简单，甚至没有开/关闭开关（它有效且始终处于打开状态）。我希望能够通过命令行打开/关闭它。这是我尝试的方法：
The deal is: I bought an usb powered led lamp, which is very simple and doesn't even have an on/off switch (it works and is always on). I want to be able to turn it on/off via command line. Here's what i tried:
echo on > /sys/bus/usb/devices/usb1/power/level # turn on
echo suspend > /sys/bus/usb/devices/usb1/power/level # turn off
这就是我已经在许多论坛上找到了。启用 on是有效的，但是 suspended会产生
which is what i've found on many forums. Turning "on" works, but "suspending" yields
-su: echo: write error: Invalid argument
每一个usbN。我也尝试过
for every usbN. I also tried
echo "0" > "/sys/bus/usb/devices/usbX/power/autosuspend_delay_ms"
错误，但也不执行任何操作（再次，对于每个usbN）
which doesn't give an error, but also doesn't do anything (again, for every usbN)
尝试
echo "usb1" > /sys/bus/usb/drivers/usb/unbind
仅适用于更多智能设备，例如键盘，鼠标或USB wifi卡。我的意思是，只有tyhose设备处于关闭状态，其他usbN不会出错，但是指示灯永远不会熄灭。
works only for more "inteligent" devices, like the keyboard, the mouse, or the usb wifi card. What i mean is that only tyhose devices are turned off, other usbN don't give an error, but the lamp never goes off.
/ sys / bus的内容/ usb / devices /
the contents of /sys/bus/usb/devices/ are
1-0:1.0 1-1:1.0 1-2:1.0 1-2:1.2 2-0:1.0 4-0:1.0 4-1:1.0 6-0:1.0 8-0:1.0 8-2:1.0 usb2 usb4 usb6 usb8
1-1 1-2 1-2:1.1 1-2:1.3 3-0:1.0 4-1 5-0:1.0 7-0:1.0 8-2 usb1 usb3 usb5 usb7
我尝试做
echo device_name > /sys/bus/usb/drivers/usb/unbind
，但每一个都只有一个设备usbN和NM进行反应，其形式为nm：xy yield
with every single one of them, but only the devices usbN and N-M react, the ones of the form n-m:x.y yield
tee: /sys/bus/usb/drivers/usb/bind: No such device
（我尝试放入 1-0 ：1.0， 1-0\：1.0和 1-0\：1.0，结果均相同。
(i tried putting in, for instance, "1-0:1.0", "1-0\:1.0" and "1-0\:1.0", all gave the same result).
最后一件事，执行后显示的内容
One last thing, what is shown after executing
lsusb -t
当我插入或拔出灯泡时，它不会改变。
does not change when i plug or unplug the lamp.
有什么想法吗？
推荐答案
关闭设备ID 2-1：
Turn off device ID 2-1:
echo'2-1'| sudo tee / sys / bus / usb / drivers / usb / unbind
重新打开设备ID 2-1：
Turn device ID 2-1 back on:
echo'2-1'| sudo tee / sys / bus / usb / drivers / usb / bind
在我的情况下，使用设备ID 2-1控制USB记忆棒的电源，因此
In my case, using device ID 2-1 controls power to my usb stick, and as a consequence controls the light.
- 提示：如果它们在Debian中为您工作，请为它们创建一个别名，以使您以后的生活更轻松。 / li>
- TIP: If they work for you in Debian, create an alias for them to make life easier for you later.
希望有帮助，
Su
Hope this helps, Su
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