Robert Hancock wrote:
Casey Dahlin wrote:
Most USB keys nowadays have a small LED somewhere inside of them that
lights up when they are plugged in. On a windows box, the key is lit
up whenever it is mounted, and as soon as it is unmounted it turns
off, giving a handy physical indicator that the key is safe to remove.
On linux, the light is simply on whenever the key is plugged in.
Should linux toggle the light depending on mount state? Is it as
trivial as it seems or does this reflect some larger issue?
I think that Windows turns off power to the port when you do the "safely
remove hardware" on it, or something like that. Mount/unmount doesn't
really indicate whether the device is in use in Linux, though, since it
can still be potentially accessed even when the device isn't mounted.
If there is a way to toggle the power state from userspace, then a
desktop environment or userland tool can emulate the Windows behavior if
that is desired. A lot of devices can charge via USB now, and this is
actually more convenient on Linux than on Windows (in effect Windows
requires drivers in order to charge something). However, having direct
control over this is useful.
According to the following thread, it appears one can get the needed
functionality through libusb:
http://www.mail-archive.com/[email protected]/msg19131.html
http://www.gniibe.org/ac-power-by-usb/ac-power-control.html
- Jim
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