unichrome - Rotate-functionality

[Markus Heller]

Dear developers,

can anyone of you please help me with some piece of information: 

I need really functional Rotate-support (randr) for an according x.org driver 
for a unichrome graphics chipset. 

The kernel drivers are here:

latest versions:
http://www.viaarena.com/default.aspx?PageID=420&OSID=25&CatID=2580&SubCatID=1
01

for older versions:
http://www.viaarena.com/default.aspx?PageID=420&OSID=25&CatID=2580&SubCatID=1
01&Old=1

Does a driver exist which enables me to rotate a screen with this chipset and 
xorg?

Thanks in advance,
Markus