On 9/28/07, John Nemeth <jnemeth@victoria.tc.ca> wrote:
> On Feb 18, 11:15am, "=?UTF-8?Q?Karl_Sj=C3=B6dahl_-_dunceor?=" wrote:
> } On 9/28/07, John Nemeth <jnemeth@victoria.tc.ca> wrote:
> } > On Jan 14,  1:02am, Christos Zoulas wrote:
> } > } In article <20070928020839.1acf6daf@berkshire.machshav.com>,
> } > } >On Thu, 27 Sep 2007 23:28:52 +0200
> } > } >Anders Hjalmarsson <hjalmar@hjalmar.to> wrote:
> } > } >
> } > } >> My Ericsson phone is similar, I get the 'drive offline' message, but
> } > } >> I can mount it without problems anyway.
> } > } >> Part of dmesg:
> } > } >>
> } > } >> umass0 at uhub4 port 2 configuration 1 interface 8
> } > } >> umass0: Sony Ericsson Sony Ericsson K750, rev 2.00/0.00, addr 5
> } > } >> umass0: using ATAPI over Bulk-Only
> } > } >> atapibus1 at umass0: 2 targets
> } > } >> sd0 at atapibus1 drive 0: <Sony Eri, Memory Stick, 0000> disk
> } > } >> removable sd0: drive offline
> } > } >> sd0: fabricating a geometry
> } > } >>
> } > } >The "drive offline" seems to be a common transient; I get that with my
> } > } >iPod nano, too, but it always mounts immediately.
> } > }
> } > } We should also add a driver so that it can charge. It is pretty simple.
> } >
> } >      Dumb question, but why does it need a driver for charging.  Why
> } > isn't simply plugging it in sufficient?
> }
> } The reason why is that it needs an ok from the computer that it has
> } identified and completed the handshake. Only identifyed objects are
>
>      If there isn't a custom driver, it would be attached as ugen.
>
> } allowed to draw current from the computer. The phone is in different
>
>      There are plenty of things that draw power such as little fans and
> lights which don't have any electronics at all.  Although, I guess it
> is possible that these devices are playing fast and loose with the
> specs.
>

Indeed, some of them will generate a complaint on osx that the device
is pulling more power than it was allowed to request.

http://en.wikipedia.org/wiki/USB#Power