Thank you very much! I did not realized that it is not a good choice to calibrate the monitor using 16bpp mode. On Sun, Jan 21, 2007 at 12:32:24AM +1100, Graeme Gill wrote: > Serge Gavrilov wrote: > >My Video Card is Matrox MGA450, dualhead. > > > >I try to use Agryll CMS to load ICC profile. First I tried > > > >dispwin -r > > > >The result is > >We don't have access to the RAMDAC > > > >I would greatly appreciate any help with this. > > > >This is ltrace output (perhaps this could be useful): > > The other thing to do is turn DEBUG on in dispwin.c and recompile. > > Judging from the trace though, one explanation is that the number of > entries in > the RAMDAC doesn't match the screen depth. Perhaps you haven't set your > display to a 24 bit depth visual ? There's really no point in trying > to calibrate a display unless it is at least running 24 bit, and I've > no idea how a less than 8 bit per component frame buffer is wired to > a 256 entry RAMDAC. > > Graeme Gill. > -- Serge