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SubjectRe: USB devices fail unnecessarily on unpowered hubs
Andrew Morton wrote:
> On Thu, 01 Jun 2006 02:18:20 -0700
> ..
>> This is generating a lot of grief and appears to be unnecessarily
>> strict. Common USB sticks with a MaxPower value just above 100mA, for
>> instance, typically work fine on unpowered hubs supplying 100mA.
>>
>> Is a more user-friendly solution possible? Could the shortfall
>> information be passed to udev, which would allow rules to be written per
>> device?
..
> Yes, it sounds like we're being non-real-worldly here. This change
> apparently broke things. Did it actually fix anything as well?

I think a far more sensible approach would be to just ensure that the
total current draw for the (unpowered) hub and all connected devices,
stays below the 500mA allowed. So a 200mA device could coexist with
a 100mA device on a hub which itself steals 100mA.

Cheers
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