hello Jonathan THANK YOU!!! i changed the pixel clock as you calculated and now the refresh rate is 1024x768 @ 100Hz :))))) have a nice weekend :) bye ----- Original Message ----- From: "Jonathan Rawle" <jr36@xxxxxxxxxxxxxxx> To: <fedora-list@xxxxxxxxxx> Sent: Friday, May 21, 2004 4:00 PM Subject: Re: FC2 - only 85Hz > Janis K wrote: > > > it shows this: > > > > "1024x768" 94.50 1024 1072 1168 1376 768 769 772 808 +hsync > > +vsync > > > >> > >> The first number after "1024x768" is the "Pixel clock" in MHz. The > > formulas > >> connecting the different frequencies are: > >> > >> Horizontal sync = Pixel clock / HTotal > >> Vertical sync = Horizontal sync / VTotal > > > > so my pixel clock shows 94.50 and xvidtune shows that HTotal = 1376 and > > Vtotal = 808 (is it in Hz?) > > and to calculate with the formulas i have this: > > > > Horizontal sync = pixel clock / Htotal = 94.50 / 1376 = 0.068677325581... > > Vertical sync = Horizontal sync / VTotal = 0.068677325581 / 808 = 0.000085 > > > > is it so? I think I'm doing something wrong with these Hz/kHz/MHz ... I > > have no idea about this and I am terribly afraid to demage my monitor > > > > The pixel clock is 94.50 MHz = 94500000 Hz > (the correct units are shown in the xvidtune window) > > If you want 100 Hz Vertical sync, you need > Horizontal sync = 100 Hz x 808 = 80800 Hz > (that's 80.8 KHz, so make sure your monitor can handle this!) > > Pixel clock = 80800 Hz x 1376 = 111180800 Hz = 111.18 MHz > > So replace 94.50 with 111.18 in your Modeline. > > As long as you have the VertRefresh and HorizSync limits right in xorg.conf, > there shouldn't be any risk of damaging your monitor. If the new mode you > have defined is incompatible, X will simply choose a mode with a lower > refresh rate instead (i.e. it'll still be on 85 Hz) If that happens, try a > lower pixel clock. > > Jonathan > > > > > -- > fedora-list mailing list > fedora-list@xxxxxxxxxx > To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list >
