On Mon, 22 Nov 2010 12:14:45 -0500 (EST), Sthu Deus wrote: > > I can not set a desired V-frequency for a Samsung CRT monitor (an old > one). - As far as I understand from its own menu, it supports > resolution 800x...@85 Hz, then 1024x...@85 Hz and 1024x...@70 Hz. > > I specify in xorg.conf to use: > > resolution 1024x768 > VertRefresh 85.0 > > then X-server uses 800x...@85 Hz mode, > > if > > resolution 1024x768 > VertRefresh 70.0-85.0 > > then X-server uses 1024x...@70 Hz mode. > > How I can make it using 1024x...@85 Hz mode?
Usually, in situations like this, the limiting factor is the maximum pixel clock rate of the video card. Assuming a non-interlaced video mode is being used, the general formulae which govern trade-offs are as follows: pixel_clock_rate / horizontal_frame_length = horizontal_refresh_rate horizontal_refresh_rate / vertical_frame_length = vertical_refresh_rate Note that I used the variables horizontal_frame_length and vertical_frame_length, not horizontal_resolution and vertical_resolution. They are not the same. The former include the sync pulses and guard times, the latter do not. But in general, as horizontal_resolution increases, so does horizontal_frame_length, and as vertical_resolution increases, so does vertical_frame_length. Sometimes, a given video card just doesn't have enough bandwidth (maximum pixel clock rate) to drive a monitor at its maximum vertical refresh rate at its maximum resolution. If you will post your /etc/X11/xorg.conf file and the resulting /var/log/Xorg.0.log file, I will take a look at it for you to see if this is the case. -- .''`. Stephen Powell : :' : `. `'` `- -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/1507147806.594160.1290482598700.javamail.r...@md01.wow.synacor.com
