Re: [9fans] Raspberry Pi: won't recognize the USB mouse

[Ramakrishnan Muthukrishnan <vu3rdd@gmail.com>]

On Fri, Feb 28, 2014 at 9:54 PM, Bakul Shah <bakul@bitblocks.com> wrote:
> On Fri, 28 Feb 2014 09:45:42 EST Anthony Sorace <a@9srv.net> wrote:
>>
>> Based on my own experience with USB weirdness with the Pi, I still suspec
>> power issues. How are you powering the Pi itself? Using a 1 amp supply yielded
>> problems, regardless of the sort of hub I had, which all went away when I
>> switched to a 2 amp supply. I'm told the second generation of these boards are
>> a bit better on that regard, but I don't have any to test.
>
> The RasPi FAQ suggest 1.2A or more. In rev 2 they replaced two
> current limiting polyfuses with shunts so you can use a a
> powered hub or connect periphs requiring > 100mA.
>
> The RasPi wastes a lot of power. Its processor require 1.8V
> and only the USB requires 5V.  For battery powered use people
> have tried a number of tricks to reduce power use: replace the
> onboard linear reg. with a switcher or two, tie 5V + 3.3V
> together and only use a USB periphs that runs on 3.3V & use
> model A Raspi -- the ethernet chip on model B draws a lot of
> power even when idle and you don't need it for wifi.
> Apparently Ralink RT5370 basedt cheapo wifi dongles can run on
> 3.3V.

Okay, I tried a powered hub. Now, it boots with both keyboard and
mouse (previously it used to hang when I connect both keyboard and
mouse). But still the keyboard and mouse are not recognized. Once I
saw a "warning" message that the descriptor length is short. But when
I rebooted, I didn't see that message.

Well, I now have a plan9 installation under qemu (compiled from the
git sources, as I couldn't boot the one shipped with Debian unstable).
If there is something I can try and test to help out with usb, I will
gladly help.

Thanks
Ramakrishnan