----- Original Message ----- From: "Jonathan Rawle" <jr36@xxxxxxxxxxxxxxx> To: <fedora-list@xxxxxxxxxx> Sent: Friday, May 21, 2004 1:51 PM Subject: Re: FC2 - only 85Hz > Janis K wrote: > > > hello > > > > FC2 found my video cards as NVIDIA GeForce2 MX (generic) as it really is, > > and I have SONY Trinitron Multiscan E230 monitor 17'' (during the > > installation, FC2 recognized my monitor as SONY CPD E230), but FC2 Control > > Center shows ONLY 85Hz @ 1024x768 - why it is so? > > > > on WinXP my monitor works with 100Hz @ 1024x768 > > > > how can I turn 100Hz @ 1024x768 on FC2? > > > > For some reason, modes with higher refresh rates are not defined in the > default X configuration. You need to add a ModeLine to your xorg.conf > > >From a terminal, run xvidtune > > Click "show" - a line of numbers will appear in the terminal 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 > > Note: HTotal and VTotal are larger than the resolution of the screen, as > indicated in xvidtune. yes it is: my HTotal = 1376 and Vtotal = 808 > > You can work out what you should change the pixel clock to in order to > obtain a 100Hz mode. > can you please tell me how to calculate it? I have never worked with such thing > Now open your /etc/X11/xorg.conf in an editor. Find the "Monitor" section > and ensure that the specs for your monitor are correct - HorizSync (in KHz) > and VertRefresh (in Hz) MUST be right, or you risk damaging your monitor. > Check in the manual that they are correct. (I say this to cover myself - > you edit xorg.conf at your own risk). > > Once you have done that, add an extra line in the Monitor section: > Modeline "1152x864" 144.00 1152 1216 1344 1600 864 865 868 900 +hsync > +vsync > > This is exactly the output from xvidtine with Modeline added to the > beginning (this is my example, yours will be different for 1024x768). Now > alter the pixel clock to the number you calculated. > > Restart X, and now you should have a higher refresh rate. > > Why they can't provide high refresh rate modes with X I don't know. > > Hope that helps, > > > Jonathan > thank You Jonathan > > > -- > fedora-list mailing list > fedora-list@xxxxxxxxxx > To unsubscribe: http://www.redhat.com/mailman/listinfo/fedora-list >
