Thanks to the various people who responded.
Wayne Stallwood said:
Have you set the HorizSync and VertRefresh rates in your config file to those specified by the monitor manufacturer ?
Yes I have
Adam Bower said:
Thats along my lines of thought, most of the panels I have played with have an auto-adjust button that resizes the screen. Does yours have one, and does it work?
Yes it does have one but I haven't tried it when the display is squashed.
Also if you turn the screen off and on again does that make it work?
Yes. I hadn't though to try that but it does correct the problem.
Of course one other option is that can you get DVI output from your graphics card and into your screen also?
I have a Matrox G400 which appears not to have a DVI output although the TFT panel does have a digital input.
Dan Beimborn said:
Running xvidtune will help you create your exact modeline, and strangely enough so will AdvanceMame video setup program. Once you have that modeline in for your desktop resolution, it should always work.
I tried that but it made no difference. It could be that the line I added to XF86Config-4 wasn't correct. I reproduce the relevant sections below:
Section "Monitor" Identifier "Viewsonic VG191" HorizSync 30.0-82.0 VertRefresh 50-75 #ModeLine "1280x1024" 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync Option "DPMS" EndSection
Section "Screen" Identifier "Default Screen" Device "Matrox G400" Monitor "Viewsonic VG191" DefaultDepth 24 SubSection "Display" Depth 1 Modes "1024x768" "800x600" "640x480" EndSubSection SubSection "Display" Depth 4 Modes "1024x768" "800x600" "640x480" EndSubSection SubSection "Display" Depth 8 Modes "1280x1024" "1024x768" "800x600" "640x480" EndSubSection SubSection "Display" Depth 15 Modes "1024x768" "800x600" "640x480" EndSubSection SubSection "Display" Depth 16 Modes "1280x1024" "1024x768" "800x600" "640x480" EndSubSection SubSection "Display" Depth 24 Modes "1280x1024" "1024x768" "800x600" "640x480" EndSubSection EndSection
The modeline, now commented out, was the one xvidtune gave me.
Barry Samuels http://www.beenthere-donethat.org.uk The Unofficial Guide to Great Britain