[Libdlo] Sheevaplug and UM-720S Intermittent failure to display

Todd McCandlish mccandlt at gmail.com
Fri May 28 09:02:15 PDT 2010

Yes, I did try the external hub but that showed the same symptoms. It
is strange because on every boot that I do, I get the "green screen"
which indicates that the device is registered and can be communicated
with. It seems like when the X system is started is where it gets
confused. Does anybody know where the cycling of the different screens
comes from? Is it an internal displaylink thing, a framebuffer thing ,
or an X driver thing?


On Fri, May 28, 2010 at 11:38 AM, Bernie Thompson
<bernie at berniethompson.com> wrote:
> Hi Todd,
> On Fri, May 28, 2010 at 8:14 AM, Todd McCandlish <mccandlt at gmail.com> wrote:
>>  During the boot up process the display turns green (as expected). Once the
>> system launches GDM the screen flickers and then goes into a cycle
>> where a solid red screen is displayed for second,
>> followed by a greenscreen,
>> then blue,
>> then blank,
>> then grey,
>> then a checker board.
>> This pattern repeats until I kill the running Xorg and then GDM
>> restarts and then the normal Debian login screen comes up and all
>> seems well.
> It's hard to say, but this sounds like a power issue to me.  The
> UM720S consumes more than the 500mA of power given by the USB
> specification.  That works with most PCs, but perhaps not with the
> SheevaPlug (especially for the current rush at power on).
> Have you tried connecting the Mimo monitor through an AC powered external hub?
> Best wishes,
> Bernie
> http://plugable.com/

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