Dear All, I seem to have a problem in getting my LCD screen calibrated. I try this on a Linux system, OpenSUSE11.2 to be precise and the screen in question is that of a DELL precision M6400. I have downloaded version 1.10 (64-bit). The screen that I am trying to calibrate is the one of the laptop itself, so not an external one. The laptop has an NVIDIA Quadro FX 2700M video card and I use the propriety drivers from NVIDIA. I use the dispcal command for that: dispcal -v -qh -y l dell_m6400 Then I select the first test and try to adjust the brightness of my screen. In order to do this, I use the nvidia supplied tool for adjusting the screen settings. However, as soon as I change any of the settings, ArgyllCMS seems to be putting things back into their original values and hence I am unable to make any adjustments. How would I solve this issue? Thanks for any help, Gerben Venekamp