Hi, ich hatte vorher schon alles getestet, was zu vorgeschlagen hattest.
Leider ohne Erfolg.
Meine Annahme: Es muß an der Matrox P650 liegen -> neues Bios / Bioseinstellungen ???
Bei den Biosfiles zur Matrox bin ich dann fündig geworden: Ein Program namens "ParVBE.exe" schaltet einen VBE-Modus um.
Mode 101h mußte ich ausschalten!
Seitdem wird alles RICHTIG dargestellt.
Aus dem Readme:
Matrox VBE Setup
BIOS ("Basic Input/Output System") information is stored on your
Matrox graphics hardware. This information is for basic graphics
functions and includes support for VBE ("Video BIOS Extension")
display modes. The specifications for VBE modes are defined by
VESA ("Video Electronics Standards Association").
VBE modes may be used by some older DOS-based Super VGA programs
and by the BIOS of your computer. (The BIOS of your computer is
separate from, and not to be confused with, the BIOS of your
Matrox graphics hardware.) Your computer BIOS may use a VBE
display mode, for example, to display the logo of the computer
manufacturer immediately after you restart your computer.
The BIOS of some computers may not properly handle information
from the Matrox BIOS and, as a result, you may experience problems
with VBE display modes. If you experience problems with VBE
display modes, it's most likely to be with mode 101h (101
hexadecimal: 640 x 480, 256 colors). This mode is sometimes used
to display the logo of the computer manufacturer immediately after
the computer restarts. If this mode is improperly handled, the
image on the screen may be garbled. Problems with VBE display
modes don't affect any software that uses a Matrox display driver
(for example, Windows software).
If you experience problems with a garbled display immediately
after you restart your computer, contact the manufacturer of your
computer for a possible software update for your computer BIOS.
If an update isn't available for your computer BIOS, you may be
able to configure the BIOS of your computer to use a different
display mode or to display a blank screen when you restart your
computer. For example, on some computers, the "Boot Time
Diagnostic Screen" setting determines what (text or full-screen
logo) is displayed immediately after your computer restarts.
If an update isn't available for your computer BIOS and this BIOS
can't be configured to use a different display mode, you can use
the "Matrox VBE Setup" program to disable (or enable) mode 101h.
If this display mode is disabled and your computer normally uses
this mode immediately after restarting, your computer screen may
be blank until the operating system (for example, Windows XP)
starts. (A blank screen may be preferable to a garbled screen
Another option is to use the "Matrox System Logo Fix" program to
reconfigure mode 101h for this special case.
VBE Setup usage
To use the "Matrox VBE Setup" program to enable or disable mode
101h, simply start the "ParVBE" program from Windows and follow
the on-screen instructions. This program will change the BIOS of
your Matrox graphics hardware.