USB to VGA
sverma at sfsu.edu
Tue Dec 7 16:29:04 EST 2010
On Tue, Dec 7, 2010 at 10:24 AM, Kevin Gordon <kgordon420 at gmail.com> wrote:
> I have set up a little XO test environment for USB to external VGA. I've
> done minimal testing, but if anyone would like me to try anything
> specifically, or give me a detailed test plan, please let me know.
> Here is what I have
> 1 XO 1.5 running os4
> 1 XO 1.5 running 357
> 1 XO 1.0 running os4
> 1 XO 1.0 running 357
> 1 Startech USB2VGA
> 1 Startech USB2VGA2
> 1 Dell 23" with VGA cable
> 1 HP 55" with VGA cable.
> Out of the box what I have noticed in a very simple plug-and-play set of
> tests is:
> Both 1.5's with both Startechs, with both monitors: If the monitor is
> already turned on, and already plugged into the USB port on the XO 1.5
> before cold boot, the external monitor becomes active and looks fantastice,
> every time. This works on both the Sugar and Gnome boots. System doesnt
> seem to care if anyting else has been plugged into the USB port between
> boots, still comes up first time every time.
> Both 1.0's with both Startechs with both monitors: If the monitor is
> already turned on, and already plugged into the USB port on the XO 1.0
> before cold boot, the external monitor becomes active and looks fantastic,
> most the time. This is the case on both the Sugar and Gnome boots. The
> most the time comes from : If I have plugged a different USB device into
> the port between boots, the XO 1.0 stalls at the 'third dot around the
> circle' during boot and flashes the external monitor. This stall does not
> seem to exit. The only exit n my arsenal is the power off button. However,
> on the subsequent boot, not having swapped any different USB device, that
> boot goes right round the circle, and activates the external monitor.
> The above seems a bit strange, but it is consistent.
> I have had absolutely no success in plugging any adapter with any monitor
> into any of the XO's after XO is up. LSUSB recognizes the adapter, but
> doesn't activate the external monitor.
> I have had no success in unplugging the adapter while the external monitor
> is active. The internal XO display does not come back active, and
> replugging the external adapter does not bring the external monitor back
> active. Oops, now need to Power off again.
> Another little note, when the external becomes active when booting the Sugar
> desktop, the internal display goes blank, once the External goes active.
> When booting on the Gnome side, the internal display continues to display a
> sort of console output, but it remains static.
> Again, if anyone wants me to test other things, or any specific
> combinations, please let me know. I may need instructions to monitor what
> you want to see, (I.e.; I'm sure there are guffaws and giggling about my
> comment 'third dot around the circle'); but, I'm willing to learn.
> Devel mailing list
> Devel at lists.laptop.org
Are you seeing any significant difference between the Startech
dongles? What is the difference between v1 and v2? Will xrandr help in
configuring the displays after plugging in the USB past bootup?
Dr. Sameer Verma, Ph.D.
Associate Professor, Information Systems
Director, Campus Business Solutions
San Francisco State University
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