On Thu, Apr 2, 2015 at 11:48 AM, Peter Chen wrote:
>
>> Yes
>>
>> >> reported as self powered, per port power limit is 500 mA, so the
>> >> device may be configured and maybe work normal.
>> >>
>> >
>> > I see your hub report its max power is 100 mA, so if it can report as
>> > self powered, then
> Yes
>
> >> reported as self powered, per port power limit is 500 mA, so the
> >> device may be configured and maybe work normal.
> >>
> >
> > I see your hub report its max power is 100 mA, so if it can report as
> > self powered, then the hub's behavior is correct, and will not be
> > rejected
defined
>> >> by the usb.org. It requires an error message when a device (Max power
>> >> descriptor >100mA) is attached to an external bus powered hub.
>> >>
>> >> But when I attached the bus powered hub to Linux (Ubuntu 14.04), I
>> >> found that it always r
load (500mA for usb 2.0
> >> hub) since reported as self powered hub.
> >> So when I attach a usb device with ( 100mA < Max power descriptor <=
> >> 500mA), linux won't show error messages.
> >>
> >> I'm wondering why the bus powered hub reporte
On Wed, 1 Apr 2015, Rong Wang wrote:
> Hi Alan,
>
> Thanks for the confirmative answer, since I suspect it's the bug
> of the hub first, but all the three hubs at my hand report the same
> status.
I have had some hubs that made the same mistake.
> I can see why the hubs are reported as self pow
t;mA_per_port is always set as full_load (500mA for usb 2.0
>> hub) since reported as self powered hub.
>> So when I attach a usb device with ( 100mA < Max power descriptor <=
>> 500mA), linux won't show error messages.
>>
>> I'm wondering why the bus power
ince reported as self powered hub.
> So when I attach a usb device with ( 100mA < Max power descriptor <=
> 500mA), linux won't show error messages.
>
> I'm wondering why the bus powered hub reported as self powered? And is
> any switch to make it bus powered?
The reason i
>mA_per_port is always set as full_load (500mA for usb 2.0
hub) since reported as self powered hub.
So when I attach a usb device with ( 100mA < Max power descriptor <=
500mA), linux won't show error messages.
I'm wondering why the bus powered hub reported as self powered? And is
a
