Set desktop refreshing frequency

[Mr.Jack]

How can I set or change my desktop's refreshing frequency ( like 85Hz or 100Hz ) when using Knoppix Live CD? Thanks in advance!

[Markus]

From: http://www.knoppix.net/wiki/Cheat_Codes

xvrefresh=60 or vsync=60
Use 60 Hz vertical refresh rate for X

xhrefresh=80 or hsync=80
Use 80 kHz horizontal refresh rate for X