[Libdlo] QWT Screen Update Problem

Alexander Todorov atodorov at otb.bg
Mon Feb 21 08:50:59 PST 2011

На 21.02.2011 15:54, Chris Pike написа:
> Hi
> I'm trying to run a GUI application on my Mimo 720 displaylink monitor
> using QWT (QTEmbedded) to draw to the framebuffer. I'm running Xubuntu
> 10.04 so the driver is built into the distribution. I'm having trouble
> with screen updates. I have tried running a Qt example application
> targeted at the displaylink monitor's framebuffer e.g.
> /path/to/Qt/examples/widgets/analogclock/analogclock -qws -display
> "LinuxFb:/dev/fb1"
> Nothing appears on the monitor (it is just the green bg) until I close
> the application, when the clock GUI appears, showing the time at which I
> closed it.

Hello Chris,
are you using X server or trying to write to the frame buffer directly?

If you're using Xorg then you also need the modified xorg-fbdev driver that 
works with DisplayLink devices and you also need:
Option "ReportDamage" "true"

in the Device section of your xorg.conf.


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