Date: Mon, 18 May 2009 10:47:50 -0300 From: Renato Botelho <rbgarga@gmail.com> To: Hans Petter Selasky <hselasky@c2i.net> Cc: freebsd-current@freebsd.org Subject: Re: [new-usb] - USB_ERR_NO_POWER on keyboard hub Message-ID: <747dc8f30905180647r76ec74b5ud90eb2c062aef988@mail.gmail.com> In-Reply-To: <200905181546.02302.hselasky@c2i.net> References: <747dc8f30905180627h25c83dbt8b5fd8527bad6f15@mail.gmail.com> <200905181546.02302.hselasky@c2i.net>
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On Mon, May 18, 2009 at 10:46 AM, Hans Petter Selasky <hselasky@c2i.net> wrote: > On Monday 18 May 2009, Renato Botelho wrote: >> I have a Sun USB Type 7 keyboard, and this keyboard has an USB hub >> with 3 ports on it. I'm using one of those 3 ports to plug the mouse and >> it's working fine. >> >> uhub5: 4 ports with 3 removable, bus powered >> ugen0.3: <Alcor Micro> at usbus0 >> ums0: <Alcor Micro USB Mouse, class 0/0, rev 1.10/51.27, addr 3> on usbus0 >> ums0: 3 buttons and [XYZ] coordinates ID=0 >> ugen0.4: <Sun Microsystems> at usbus0 >> ukbd0: <Sun Microsystems Type 7 USB keyboard, class 0/0, rev >> 2.00/1.04, addr 4> on usbus0 >> kbd2 at ukbd0 >> >> When I tried to plug a pen drive on anothe one, I got this: >> >> usb2_set_config_index:531: power exceeded 500 > 100 >> usb2_set_config_index:531: power exceeded 500 > 100 >> usb2_alloc_device:1755: Failure selecting configuration index 0: >> USB_ERR_NO_POWER, port 2, addr 5 (ignored) >> ugen0.5: <ALi Corp.> at usbus0 >> pid 3705 (hald-probe-usb2-dev), uid 0: exited on signal 11 >> ugen0.5: <ALi Corp.> at usbus0 (disconnected) >> >> usb2_set_config_index:531: power exceeded 500 > 100 >> usb2_set_config_index:531: power exceeded 500 > 100 >> usb2_alloc_device:1755: Failure selecting configuration index 0: >> USB_ERR_NO_POWER, port 1, addr 5 (ignored) >> ugen0.5: <ALi Corp.> at usbus0 >> pid 3886 (hald-probe-usb2-dev), uid 0: exited on signal 11 >> ugen0.5: <ALi Corp.> at usbus0 (disconnected) >> >> I'm using FreeBSD 8.0-current r192140. >> >> Let me know if there is more information i need to provide. >> >> Thanks > > Hi, > > Your Keyboard HUB technically does not allow current consumption above 100mA > per port. Your memstick reports it needs 500mA. Probably you can hack around > it, but then your hardware might break ... Yep, I found now this text on Sun FAQ: What is power budget control? Power budget control is specified in USB spec to limit device connections to a hub to avoid overcurrent condition. A self-powered hub can supply a maximum of 500mA to each port, while a bus-powered hub should only supply a maximum of 100mA to each port. With power budget control, devices consuming power more than 100mA will be denied connection to a bus-powered hub. And two bus-powered hubs are not allowed to be concatenated. I can live without it, prefer to keep my kbd working :) Thank you -- Renato Botelho
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