Mark Vojkovich wrote:
On Mon, 14 Feb 2005, Carl F. Hall wrote:
Thanks for the suggestions Mark.
I changed the vert sync range and horiz. range to the those you said were in the log file for the monitor's EDID. After doing so, I still had the problem but now have available 75Hz along w/ 60Hz. I didn't think my monitor worked at anything by 60 but whatever. So I selected 75Hz and the overlap went away! If this will detremental to my monitor, someone please let me know. Otherwise, I'm going to keep on going with it.
As long as you have the correct ranges 56-76 vertical, 30-80 Horizontal in the Section "Monitor" you should be OK. Those were taken from the monitor's EDID (plug and play info). The EDID claims it's a "DELL 1701FP". The manufacturer's specifications:
http://support.dell.com/support/edocs/monitors/04pjr/en/specs.htm
claim that it can do 1280x1024@75Hz.
Mark.
Thanks again for all of the very knowledgeable help.
_Carl
Mark Vojkovich wrote:
The monitor's EDID (printed out in the logfile) indicates a prefered mode, which implies the native panel resolution is 1280x1024. It also specifies a vertical sync range of 56-76 Hz and horizontal range of 30-80 kHz (you have 50-75 and 30-65 in your XF86Config). XFree86 chose a 1280x1024@60Hz (64KHz) VESA mode with an identical refresh rate to the prefered mode in the EDID. In short, the mode XFree86 chose should have worked, and it sounds like it did at one time, so I guess we can't rule out a hardware issue. You can try changing the sync pulses. It's using the following modeline now:
Modeline "1280x1024" 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
If you put that line in the Section "Monitor" XFree86 will use it instead of the internal one. You can change the pulses by changing the +/- before the hsync and/or vsync. You also might want to check your monitor cable to make sure it's plugged in tightly. If this doesn't work you could try lowering that pixel clock (the 108.00) a bit to see if it works any better (eg. something between 102 and 108).
Does your video card have a DVI connector? If you use it you will be bypassing your monitor's analog circuitry.
Mark.
On Mon, 14 Feb 2005, Carl F. Hall wrote:
I have an LCD monitor that does auto adjustments based on the input and not a lot, but some, adjusting I can do manually outside of color and contrast. Other resolutions seem to work fine so I can't agree with the hardware assessment but I'm not informed enough on the area to completely disagree. Is there anything I can change in the config to change the vertical synch pulses and maybe fix it that way?
Doug McNutt wrote:
At 10:40 -0500 2/14/05, Carl F. Hall wrote:
I have an overlap at the bottom of the screen that is a copy of the first 10-15 pixels of the top of the screen. I'm running at 1280x1024. When I switch to 1024x768, the problem doesn't show. I've tried adjusting the monitor but there are useful things, namely the status bar, behind that overlap.
Sounds like a typical hardware problem. The internal adjustment in your monitor is probably called vertical phase. The monitor is failing to synch tightly to the vertical synch pulses form the video card when the rate is pushed too high. If you're lucky it's just an internal adjustment but it's more-often due to change in value of a capacitor on the printed circuit board. I doubt that those pixels are actually copies but if they are I'm all wrong. The video card would have to be thoroughly messed up to send some pixels twice.
It's extremely rare for that kind of problem to originate in a video card.
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