Hello
I have recently installed Fedora Core 2. I have had this problem with Red Hat before but. I have a SyncMaster 3 monitor. It is in the list of supported monitors but if I select it, it doesn't work. Currently I have it set to Generic 800x600 which is driving me nuts. From what I understand the SyncMaster 3 model CQA4147 can support 1024x768. How can I configure xorg.conf to get it to this resolution or if someone knows where I can find a manual for free, please tell me.
Thank You for reading this

I don't know where to find a manual, but I would try the Samsung website. The manual for my monitor is a pdf file and I have to browse through to fing the "specifications" section, which gives the refresh rate information. Keep in mind that incorrect information can damage the monitor, so try to find tha manual and definitely read the xorg.conf file carefully before editing. I'm just guessing, but 800x600 might be your best screen, since the 1024x768 modeline says "interlace."

I found this with a google search for SyncMaster 3 model CQA4147, at http://www1.vobis.de/bbs/support/brett50/samlinx1.cfg.

Monitor: Samsung SyncMaster 3 (CQA4147*)
--------------------------------------------------------------------------------------------
ModeLine "640x480" 25.175 640 656 752 800 480 490 492 525 -hsync -vsync
ModeLine "640x480" 31.5 640 656 720 840 480 481 484 500 -hsync -vsync
ModeLine "800x600" 40 800 840 968 1056 600 601 605 628 +hsync +vsync
ModeLine "1024x768" 44.9 1024 1032 1208 1264 768 768 776 817 interlace

In your xorg.conf you will need the following:

Section "Monitor"

Identifier "Monitor1"

# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S
# USER MANUAL FOR THE CORRECT NUMBERS.

HorizSync # see your example file and users manual
VertRefresh #
DisplaySize #
Option "DPMS" # probably

ModeLine "640x480" 25.175 640 656 752 800 480 490 492 525 -hsync -vsync
ModeLine "640x480" 31.5 640 656 720 840 480 481 484 500 -hsync -vsync
ModeLine "800x600" 40 800 840 968 1056 600 601 605 628 +hsync +vsync
ModeLine "1024x768" 44.9 1024 1032 1208 1264 768 768 776 817 interlace

EndSection

Section "Screen"
Identifier "Screen 1"
Device "Device1"
Monitor "Monitor1"

# DefaultDepth 8
# DefaultDepth 16
DefaultDepth 24
# DefaultDepth 32

Subsection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubsection
Subsection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubsection
Subsection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubsection
Subsection "Display"
Depth 32
Modes "1024x768" "800x600" "640x480"
EndSubsection

EndSection