Velleman PCUSBVGA2 - Manual (Page 16)

PCUSBVGA2
V. 02 – 26/04/2012 16 ©Velleman nv
Supported Screen Modes
There are three components that make up the screen mode:
•
Resolution: the number of pixels displayed on screen horizontally and vertically.
• Colour quality: the number of different colours that can be shown on the screen at the same time.
• Refresh rate: the speed at which the entire screen is rescanned. Higher refresh rates reduce flicker.
Some screens advertise the supported modes through the VGA or DVI connector. If this is the case, the adapter
identifies the supported modes from the screen. If the screen does not advertise the supported modes, the
adapter software chooses a set of common screen modes for the screen.
Inferred Modes
Some modes in the DisplayLink menu are shown between brackets [ ]. This
occurs when you connect a display with a preferred resolution that is higher
than the maximum supported resolution of the adapter.
In this case, the preferred resolution of the display cannot be supported.
However, the DisplayLink software makes available lower resolutions of the
same aspect ratio that you can try with the display. Modes between brackets
[ ] indicate that these modes are not advertised by the display, but have been
made available by the DisplayLink software for you to try.
Because these are inferred modes from the preferred mode of the display,
they are not guaranteed to work with the display.
Error Messages
DisplayLink Graphics software occasionally displays user messages in a bubble in the notification area. The
table below lists the user messages and their description.
Message Description
Insufficient system resources
exist to complete the requested
service
This can occur when entering extended mode with low system resources.
The PC does not have enough memory to start an extended display. Close
any unused applications. The situation may also be improved by rebooting
the PC.
The requested allocation size was
too large This can occur if trying to mirror a primary display with a resolution above
2300x1700 (4:3) or 2600x1500 (16:9).
Incompatible Display Driver
This message will appear if the primary graphics card drivers installed are
not WDDM compatible. Windows 7 is not designed to operate without WDDM
drivers. Download and install the latest Windows 7 (WDDM) drivers for your
primary graphics card.
The system cannot write to the
specified device
This warning may be displayed in Windows XP after changing the display
mode several times (e.g. extended/dock mode) from the DisplayLink
software. If this happens, detach and reattach the device to restore normal
operation.
Further Support
http://www.displaylink.com/support
9. Troubleshooting
Minor issues can generally be resolved by:
•
unplugging and re-plugging the display
• changing the display mode via the DisplayLink software
• or changing the display mode via Windows Display Properties.
On Windows 7/Vista WDDM (Aero and Basic)
DisplayLink software works closely with the graphics card and there may be interoperability issues with some
graphics cards. If this happens:
1. Upgrade to the latest graphics drivers.
2. Upgrade to the latest DisplayLink software.
3. Report the issue via your support channel.
4. If necessary, boot in Safe Mode and use Windows' Backup and Restore Centre to recover.