stop USB charging

Lennart Sorensen lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org
Wed Mar 4 19:02:25 UTC 2009


On Wed, Mar 04, 2009 at 11:16:38AM -0500, jing wrote:
> Does anyone know how to turn off device charging via USB but still
> keep the connection alive?  My Google-foo fails me.  Is there some
> file in /sys that can turn off USB device charging?  When traveling I
> like to tether my iPhone over USB for Internet connectivity.  But the
> phone insists on charging itself, which puts a huge drain on my
> laptop.

USB ports must provide at least 100mA of power.  You can not disable
that as far as I know, unless you actually shut down the port completely.

If you want a device to not draw power, then make the device not draw
power.  Good luck on that.

-- 
Len Sorensen
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