SiS 740/741 Chipset - Remove Virtual Desktop 1024x768 rest..

Archived from groups: microsoft.public.windowsxp.hardware (More info?)

Hello altogether...

Sometimes i read mails about people having problems with their
SiS-based graphics card which restricts the resolution of the Windows
Desktop to 1024x768 pixel, while every higher resolution produces a
virtual desktop where the user can scroll, regardless whether Windows
XP or Windows 2000 is used. I faced the same problem with my Windows
XP, and after taking a deeper look into the registry i found a
solution for that.

Currently i'm using a SiS-741-based onboard graphics card with
UniVGA3-driver V3.63a - i hope SiS won't change their registry keys
too much in the future driver releases...

Start the registry editor and navigte to the key

"HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Video"

There you find a subkey for your graphics adapter, in my case:

"HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Video\{6609DF5E-7F17-45DC-8EDA-35248A664945}\0000"

If you now browse through the list of key-values on the right, there
is a value

"SiS.2D.NonDDCResolutionBound"="1024.768.75"

Seems that SiS uses this to prevent the user from setting their video
resolution too high which could take damage to the monitor. Change
this value, e.g. to

"SiS.2D.NonDDCResolutionBound"="1280.1024.100"

Restart your PC and - voila, you can now set your effective video
resolution higher that 1024x768 with 75 Hz.

Btw, there is another nice registry key there:

"SiS.2D.VirtualDesktop"="1"

If you switch this to "0" the Virtual Desktop will fully be disabled,
so you can only change the video resolution up to the values you
entered before...

Ok, i hope, i could help some people with that...


cya,

Michael Koester